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[Objective] The rhizosphere microorganism-plant combined approach has high application potential for the remediation of heavy metal-contaminated soil. This study observed the effects of adding exogenous plant growth-promoting bacteria (PGPB) on the growth and molybdenum (Mo) accumulation of alfalfa (Medicago sativa), aiming to provide theoretical references for plant-microbial remediation of Mo-contaminated soil. [Methods] The endophytic bacteria were isolated from dominant plants of Mo tailing and they were identified based on morphological characteristics and molecular evidence. The plant growth-promoting (PGP) properties of molybdate-reducing strains were determined. By adding exogenous PGPB into the soil, we investigated the effects of adding exogenous PGPB on the biomass, physiological activity, and Mo accumulation of alfalfa. [Results] Two molybdate-reducing strains M9 and M13 were obtained and identified as Serratia plymuthica based on morphological characteristics, 16S rRNA gene sequence, and gyrB sequence. M9 and M13 had the abilities to fix nitrogen, solubilize phosphorus, solubilize potassium, and secrete indole-3-acetic acid (IAA), siderophores, and 1-amino cyclopropane-1-carboxylic acid (ACC) deaminase. Under Mo stress, the inoculation of M9, M13, and M9+M13 significantly promoted the growth of alfalfa, increasing the plant height, root length, and fresh weight of alfalfa compared with the non-inoculation control group. At the same time, the inoculation increased the chlorophyll content and peroxidase (POD) activity while decreasing the malondialdehyde (MDA) content in alfalfa. M9 and M13 significantly affected the Mo accumulation of alfalfa. The Mo content in the above-ground and under-ground parts of alfalfa inoculated with M9, M13, and M9+M13 significantly decreased compared with that in the non-inoculation control group. The decreased enrichment factor of Mo in alfalfa indicated that inoculation with molybdate-reducing strains reduced the uptake and transport of Mo in alfalfa. [Conclusion] The molybdate-reducing strains M9 and M13 can promote the growth and reduce the Mo content of alfalfa in Mo-contaminated soil. This finding can provide theoretical reference for revealing the mechanism of microbial-enhanced Mo remediation by plants as well as the joint remediation of Mo-contaminated soil by plants and microorganisms.

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E-mail: YANG Ruixian,
TIAN Wenjie,
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【目的】根际微生物协同植物修复重金属污染土壤具有较高的应用潜力。本研究旨在强化土壤钼污染修复的理论与技术,分析添加外源钼还原促生菌对紫花苜蓿生长和钼富集活性的影响,为植物-微生物联合修复钼污染土壤提供理论参考。【方法】采集钼尾矿区内优势植物,分离与筛选钼还原内生细菌;结合形态学特征和分子生物学手段对菌株进行鉴定;测定钼还原菌株的促生特性。通过外源添加钼还原促生菌,研究其对紫花苜蓿生物量、生理活性及钼富集量的影响。【结果】获得2株钼还原活性强的菌株M9和M13,结合形态特征、16S rRNA基因序列及gyrB基因序列分析结果,2株细菌(M9和M13)均被鉴定为普利茅斯沙雷氏菌(Serratia plymuthica)。促生特性分析表明,2株细菌均具有固氮、溶磷、解钾、产吲哚-3-乙酸(indole-3-acetic acid, IAA)、铁载体及1-氨基环丙烷-1-羧酸(1-amino cyclopropane-1-carboxylic acid, ACC)脱氨酶的能力。在钼胁迫条件下,外源添加M9、M13及M9+M13复配菌株后对紫花苜蓿的促生作用显著。与未接菌对照组相比,其株高、根长和鲜重均显著增加,同时紫花苜蓿中叶绿素含量显著提高,过氧化物酶(peroxidase, POD)活性增加,丙二醛(malondialdehyde, MDA)含量降低。此外,钼还原菌株M9和M13显著影响紫花苜蓿的钼富集量,接菌处理组紫花苜蓿地上部和地下部钼含量均显著低于未接菌处理组,其富集因子显著降低,表明接种钼还原菌株后减少了紫花苜蓿对土壤中钼的吸收和转运。【结论】钼还原菌株M9和M13具有显著的植物促生特性,能够促进紫花苜蓿在钼污染土壤中的生长,并降低其钼含量。本研究为揭示微生物强化植物钼修复的机制以及促进植物-微生物联合修复钼污染土壤的相关研究提供了参考。

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作者贡献声明

杨瑞先:研究设计、数据分析和论文撰写;刘萍:钼还原菌株的分离、筛选及论文修订;石犇:钼还原菌株的鉴定;王小庆:土壤中钼含量的测定;乔翠翠:盆栽试验、钼还原菌株促生特性测定;肖静尧:参与盆栽试验,负责紫花苜蓿地上部和地下部钼含量的测定;杨沛霖:参与论文数据分析;田文杰:研究设计和论文修订。

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Journal of Agro-Environment Science, 2014, 33(10): 1882-1889 (in Chinese)., articleTitle=null, refAbstract=null)], funds=[Fund(id=1226592760615059989, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, awardId=232102320111, language=EN, fundingSource=Science and Technology Research Project of Henan Province(232102320111), fundOrder=null, country=null), Fund(id=1226592760795415069, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, awardId=232102320111, language=CN, fundingSource=河南省科技攻关项目(232102320111), fundOrder=null, country=null), Fund(id=1226592760963187240, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, awardId=242300421332, language=EN, fundingSource=Natural Science Foundation of Henan Province(242300421332), fundOrder=null, country=null), Fund(id=1226592761156125233, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, awardId=242300421332, language=CN, fundingSource=河南省自然科学基金(242300421332), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1226592749001032648, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, xref=1., ext=[AuthorCompanyExt(id=1226592749005226952, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, companyId=1226592749001032648, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1.School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang, Henan, China), AuthorCompanyExt(id=1226592749013615561, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, companyId=1226592749001032648, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1.洛阳理工学院 环境工程与化学学院,河南 洛阳)]), AuthorCompany(id=1226592750355792849, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, xref=2., ext=[AuthorCompanyExt(id=1226592750368375763, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, companyId=1226592750355792849, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2.Henan Key Laboratory of Green Building Materials Manufacturing and Intelligent Equipment, Luoyang, Henan, China), AuthorCompanyExt(id=1226592750380958677, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, companyId=1226592750355792849, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2.河南省绿色建筑材料制造与智能装备重点实验室,河南 洛阳)])], figs=[ArticleFig(id=1226592756257177931, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 1, caption=Growth of some molybdate reducing bacterial isolates on LPM agar. A: M5; B: M6; C: M9; D: M11; E: M12; F: M13., figureFileSmall=LBJ+AGditrCj1r4MerBoPQ==, figureFileBig=UZvqWDhG2EssBxBBzHoGpA==, tableContent=null), ArticleFig(id=1226592756378812761, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图1, caption=部分钼还原内生细菌在LPM平板上的生长状态, figureFileSmall=LBJ+AGditrCj1r4MerBoPQ==, figureFileBig=UZvqWDhG2EssBxBBzHoGpA==, tableContent=null), ArticleFig(id=1226592756554973538, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 2, caption=Scanning spectra of molybdenum blue of strains M9 and M13 after 72 h of incubation., figureFileSmall=MtuwXs2FRnZc7YP6fT/XPg==, figureFileBig=v+Jd/E+/sGvmhfzNhr5/fA==, tableContent=null), ArticleFig(id=1226592756668219759, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图2, caption=菌株M9M13培养72 h后的钼蓝扫描光谱, figureFileSmall=MtuwXs2FRnZc7YP6fT/XPg==, figureFileBig=v+Jd/E+/sGvmhfzNhr5/fA==, tableContent=null), ArticleFig(id=1226592756777271671, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 3, caption=Gram stain of molybdate-reducing bacterial strains M9 (A) and M13 (B)., figureFileSmall=E0hSDASHVdyNQGl6NuZbzQ==, figureFileBig=SX+brcKn/AXEB3O+1dHFdA==, tableContent=null), ArticleFig(id=1226592756903100798, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图3, caption=钼还原菌株M9 (A)M13 (B)的革兰氏染色, figureFileSmall=E0hSDASHVdyNQGl6NuZbzQ==, figureFileBig=SX+brcKn/AXEB3O+1dHFdA==, tableContent=null), ArticleFig(id=1226592757058290057, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 4, caption=Phylogenetic tree based on the 16S rRNA gene (A) and gyrB gene sequences (B) of molybdate-reducing bacterial strains M9 and M13. Phylogenetic trees were constructed using the neighbor-joining method in MEGA 7.0 with bootstrap values based on 1 000 replications. Bacillus cereus and B. amyloliquefaciens were chosen as outgroups. Gene accession numbers of bacterial strains are indicated in parentheses. The scale bar represents the number of substitutions per base position., figureFileSmall=kqQ603xLcZDKEbe+dI61Mg==, figureFileBig=n0nz4iICgBNSIEsUvVIjbQ==, tableContent=null), ArticleFig(id=1226592757200896400, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图4, caption=基于16S rRNA基因序列(A)gyrB 基因序列(B)构建的钼还原细菌菌株M9M13系统发育树, figureFileSmall=kqQ603xLcZDKEbe+dI61Mg==, figureFileBig=n0nz4iICgBNSIEsUvVIjbQ==, tableContent=null), ArticleFig(id=1226592757339308443, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 5, caption=Characterization of growth promoting properties of molybdate-reducing bacterial strains M9 and M13. A: Nitrogen fixation capacity; B: Inorganic phosphorus solubilization capacity; C: Organic phosphorus solubilization capacity; D: Potassium solubilization capacity; E: Siderophore production capacity; F: ACC deaminase activity; G: IAA production capacity., figureFileSmall=bJ63R15YdEejCxN+aKrbLQ==, figureFileBig=uvMlryW0Dg8IBtRBWFsPwQ==, tableContent=null), ArticleFig(id=1226592757477720484, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图5, caption=钼还原菌株M9M13的促生特性。A:固氮能力;B:解无机磷能力;C:解有机磷能力;D:解钾能力;E:产铁载体能力;F:ACC脱氨酶活性;G:产IAA能力。, figureFileSmall=bJ63R15YdEejCxN+aKrbLQ==, figureFileBig=uvMlryW0Dg8IBtRBWFsPwQ==, tableContent=null), ArticleFig(id=1226592757628715442, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 6, caption=Effect of molybdate-reducing bacterial strains M9 and M13 on alfalfa growth promotion. A: Concentration of 0 mg/kg Mo6+; B: Concentration of 500 mg/kg Mo6+; C: Concentration of 800 mg/kg Mo6+., figureFileSmall=04Ylht2ho7dJG09dEjAiQA==, figureFileBig=D7HjUrTRMzpMI6lzog5rWg==, tableContent=null), ArticleFig(id=1226592757767127481, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图6, caption=钼还原菌株对紫花苜蓿的促生效果。A:钼浓度0 mg/kg;B:钼浓度500 mg/kg;C:钼浓度800 mg/kg。, figureFileSmall=04Ylht2ho7dJG09dEjAiQA==, figureFileBig=D7HjUrTRMzpMI6lzog5rWg==, tableContent=null), ArticleFig(id=1226592757897150914, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Figure 7, caption=Effect of molybdate-reducing bacterial strains M9 and M13 on the chlorophyll contents, the activities of POD and MDA of alfalfa. A: Chlorophyll contents; B: POD activity; C: MDA content. Different lowercase letters indicate that the same index is significantly different (P<0.05)., figureFileSmall=UQJzoz8rxBJQMk1DL91OWg==, figureFileBig=004lffyoSudAljZ4dncfzg==, tableContent=null), ArticleFig(id=1226592758043951561, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=图7, caption=钼还原菌株对紫花苜蓿生理活性的影响。A:叶绿素含量;B:POD活性;C:MDA含量。, figureFileSmall=UQJzoz8rxBJQMk1DL91OWg==, figureFileBig=004lffyoSudAljZ4dncfzg==, tableContent=null), ArticleFig(id=1226592759419683280, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Table 1, caption=

Molybdate reduction ability of the bacterial strains after 72 h of incubation

, figureFileSmall=null, figureFileBig=null, tableContent=
StrainsAbsorbance at 865 nm
M10.42±0.02d
M20.44±0.02d
M30.34±0.02e
M40.47±0.03c
M50.29±0.02f
M60.42±0.15d
M92.54±0.15a
M100.34±0.01e
M110.35±0.02e
M120.35±0.15e
M131.64±0.01b
M140.32±0.02e
), ArticleFig(id=1226592759600038359, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=表1, caption=

内生细菌菌株培养72 h后的钼酸盐还原能力

, figureFileSmall=null, figureFileBig=null, tableContent=
StrainsAbsorbance at 865 nm
M10.42±0.02d
M20.44±0.02d
M30.34±0.02e
M40.47±0.03c
M50.29±0.02f
M60.42±0.15d
M92.54±0.15a
M100.34±0.01e
M110.35±0.02e
M120.35±0.15e
M131.64±0.01b
M140.32±0.02e
), ArticleFig(id=1226592759721673181, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Table 2, caption=

Effect of molybdate-reducing bacterial strains M9 and M13 on alfalfa growth promotion

, figureFileSmall=null, figureFileBig=null, tableContent=
Treat (Mo6++bacteria)Plant height (cm)Root length (cm)Fresh weight (g)
0 mg/kg+M9+M1332.18±1.80a22.18±1.75a6.74±0.38a
0 mg/kg+M1329.36±1.48b19.68±1.71b5.12±0.21b
0 mg/kg+M929.22±1.05bc19.59±1.38b4.80±0.25b
0 mg/kg28.31±1.06bc17.52±0.59c3.52±0.32c
500 mg/kg+M9+M1328.09±1.08c17.22±0.85c3.30±0.33c
500 mg/kg+M1326.85±1.62d17.05±0.57c2.88±0.15c
500 mg/kg+M926.63±2.52d16.94±0.70c2.58±0.16d
500 mg/kg21.46±1.53e14.43±0.75d2.07±0.12e
800 mg/kg+M9+M1321.36±0.93e14.41±0.85d2.13±0.14e
800 mg/kg+M1320.94±0.95e14.14±0.97d1.98±0.28e
800 mg/kg+M920.53±1.32e14.05±0.97d1.93±0.24e
800 mg/kg17.61±0.77f12.85±0.62e1.49±0.19f
), ArticleFig(id=1226592759851696614, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=表2, caption=

钼还原菌株对紫花苜蓿的促生效果

, figureFileSmall=null, figureFileBig=null, tableContent=
Treat (Mo6++bacteria)Plant height (cm)Root length (cm)Fresh weight (g)
0 mg/kg+M9+M1332.18±1.80a22.18±1.75a6.74±0.38a
0 mg/kg+M1329.36±1.48b19.68±1.71b5.12±0.21b
0 mg/kg+M929.22±1.05bc19.59±1.38b4.80±0.25b
0 mg/kg28.31±1.06bc17.52±0.59c3.52±0.32c
500 mg/kg+M9+M1328.09±1.08c17.22±0.85c3.30±0.33c
500 mg/kg+M1326.85±1.62d17.05±0.57c2.88±0.15c
500 mg/kg+M926.63±2.52d16.94±0.70c2.58±0.16d
500 mg/kg21.46±1.53e14.43±0.75d2.07±0.12e
800 mg/kg+M9+M1321.36±0.93e14.41±0.85d2.13±0.14e
800 mg/kg+M1320.94±0.95e14.14±0.97d1.98±0.28e
800 mg/kg+M920.53±1.32e14.05±0.97d1.93±0.24e
800 mg/kg17.61±0.77f12.85±0.62e1.49±0.19f
), ArticleFig(id=1226592759990108657, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Table 3, caption=

Effect of molybdate-reducing bacterial strains M9 and M13 on the molybdenum accumulation in soil

, figureFileSmall=null, figureFileBig=null, tableContent=
Treat (Mo6++bacteria)Molybdenum accumulation (mg/kg)Available molybdenum accumulation (mg/kg)
0 mg/kg+M9+M130.33±0.02c0.07±0.01d
0 mg/kg+M130.71±0.04b0.28±0.02c
0 mg/kg+M90.81±0.03b0.75±0.06b
0 mg/kg1.73±0.05a1.65±0.06a
500 mg/kg+M9+M13188.61±0.94c43.31±0.51c
500 mg/kg+M13147.29±0.78d41.22±0.75d
500 mg/kg+M9209.44±0.59b47.70±0.69b
500 mg/kg222.33±0.41a51.30± 0.48a
800 mg/kg+M9+M13221.42±0.78d63.40±0.37d
800 mg/kg+M13263.63±0.79c68.35±0.88c
800 mg/kg+M9369.54±0.70b78.19±0.35b
800 mg/kg381.22±0.61a85.45±0.44a
), ArticleFig(id=1226592760111743480, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=表3, caption=

钼还原菌株对土壤中钼含量的影响

, figureFileSmall=null, figureFileBig=null, tableContent=
Treat (Mo6++bacteria)Molybdenum accumulation (mg/kg)Available molybdenum accumulation (mg/kg)
0 mg/kg+M9+M130.33±0.02c0.07±0.01d
0 mg/kg+M130.71±0.04b0.28±0.02c
0 mg/kg+M90.81±0.03b0.75±0.06b
0 mg/kg1.73±0.05a1.65±0.06a
500 mg/kg+M9+M13188.61±0.94c43.31±0.51c
500 mg/kg+M13147.29±0.78d41.22±0.75d
500 mg/kg+M9209.44±0.59b47.70±0.69b
500 mg/kg222.33±0.41a51.30± 0.48a
800 mg/kg+M9+M13221.42±0.78d63.40±0.37d
800 mg/kg+M13263.63±0.79c68.35±0.88c
800 mg/kg+M9369.54±0.70b78.19±0.35b
800 mg/kg381.22±0.61a85.45±0.44a
), ArticleFig(id=1226592760212406779, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=EN, label=Table 4, caption=

Effect of molybdate-reducing bacterial strains M9 and M13 on the enrichment factor and transport coefficient of alfalfa

, figureFileSmall=null, figureFileBig=null, tableContent=
Treat (Mo6++bacteria)Above-ground (mg/kg)Below-ground (mg/kg)Enrichment factorTransport coefficient
0 mg/kg+M9+M1315.77±0.13d15.86±0.34c--
0 mg/kg+M1321.45±0.22b21.37±0.29b--
0 mg/kg+M912.63±0.15c14.72±0.42c--
0 mg/kg24.50±0.23a24.89±0.62a--
500 mg/kg+M9+M13376.38±0.86b395.17±1.71c6.311.05
500 mg/kg+M13377.67±2.45b460.85±1.08b7.471.22
500 mg/kg+M9342.17±1.32c353.50±1.32d5.351.03
500 mg/kg461.63±1.34a489.78±2.34a8.471.06
800 mg/kg+M9+M13625.47±0.87b674.51±1.45b4.221.08
800 mg/kg+M13601.17±0.95c459.84±0.87d4.480.76
800 mg/kg+M9533.86±1.36d516.08±1.58c3.320.97
800 mg/kg732.95±1.23a762.95±1.63a5.661.04
), ArticleFig(id=1226592760338235904, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1226236831595934300, language=CN, label=表4, caption=

钼还原菌株对紫花苜蓿钼富集因子和转运系数的影响

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Treat (Mo6++bacteria)Above-ground (mg/kg)Below-ground (mg/kg)Enrichment factorTransport coefficient
0 mg/kg+M9+M1315.77±0.13d15.86±0.34c--
0 mg/kg+M1321.45±0.22b21.37±0.29b--
0 mg/kg+M912.63±0.15c14.72±0.42c--
0 mg/kg24.50±0.23a24.89±0.62a--
500 mg/kg+M9+M13376.38±0.86b395.17±1.71c6.311.05
500 mg/kg+M13377.67±2.45b460.85±1.08b7.471.22
500 mg/kg+M9342.17±1.32c353.50±1.32d5.351.03
500 mg/kg461.63±1.34a489.78±2.34a8.471.06
800 mg/kg+M9+M13625.47±0.87b674.51±1.45b4.221.08
800 mg/kg+M13601.17±0.95c459.84±0.87d4.480.76
800 mg/kg+M9533.86±1.36d516.08±1.58c3.320.97
800 mg/kg732.95±1.23a762.95±1.63a5.661.04
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钼还原促生菌的筛选及对紫花苜蓿钼吸收的调控作用
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杨瑞先 1 , 刘萍 1 , 石犇 1 , 王小庆 1 , 乔翠翠 1 , 肖静尧 1 , 杨沛霖 1 , 田文杰 1, 2
微生物学报 | 研究报告 2025,65(5): 1995-2013
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微生物学报 | 研究报告 2025, 65(5): 1995-2013
钼还原促生菌的筛选及对紫花苜蓿钼吸收的调控作用
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杨瑞先1 , 刘萍1, 石犇1, 王小庆1, 乔翠翠1, 肖静尧1, 杨沛霖1, 田文杰1, 2
作者信息
  • 1.洛阳理工学院 环境工程与化学学院,河南 洛阳
  • 2.河南省绿色建筑材料制造与智能装备重点实验室,河南 洛阳
Screening of molybdate-reducing bacteria capable of promoting the growth and regulating the molybdate uptake of Medicago sativa
Ruixian YANG1 , Ping LIU1, Ben SHI1, Xiaoqing WANG1, Cuicui QIAO1, Jingyao XIAO1, Peilin YANG1, Wenjie TIAN1, 2
Affiliations
  • 1.School of Environmental Engineering and Chemistry, Luoyang Institute of Science and Technology, Luoyang, Henan, China
  • 2.Henan Key Laboratory of Green Building Materials Manufacturing and Intelligent Equipment, Luoyang, Henan, China
出版时间: 2025-05-04 doi: 10.13343/j.cnki.wsxb.20240683
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【目的】根际微生物协同植物修复重金属污染土壤具有较高的应用潜力。本研究旨在强化土壤钼污染修复的理论与技术,分析添加外源钼还原促生菌对紫花苜蓿生长和钼富集活性的影响,为植物-微生物联合修复钼污染土壤提供理论参考。【方法】采集钼尾矿区内优势植物,分离与筛选钼还原内生细菌;结合形态学特征和分子生物学手段对菌株进行鉴定;测定钼还原菌株的促生特性。通过外源添加钼还原促生菌,研究其对紫花苜蓿生物量、生理活性及钼富集量的影响。【结果】获得2株钼还原活性强的菌株M9和M13,结合形态特征、16S rRNA基因序列及gyrB基因序列分析结果,2株细菌(M9和M13)均被鉴定为普利茅斯沙雷氏菌(Serratia plymuthica)。促生特性分析表明,2株细菌均具有固氮、溶磷、解钾、产吲哚-3-乙酸(indole-3-acetic acid, IAA)、铁载体及1-氨基环丙烷-1-羧酸(1-amino cyclopropane-1-carboxylic acid, ACC)脱氨酶的能力。在钼胁迫条件下,外源添加M9、M13及M9+M13复配菌株后对紫花苜蓿的促生作用显著。与未接菌对照组相比,其株高、根长和鲜重均显著增加,同时紫花苜蓿中叶绿素含量显著提高,过氧化物酶(peroxidase, POD)活性增加,丙二醛(malondialdehyde, MDA)含量降低。此外,钼还原菌株M9和M13显著影响紫花苜蓿的钼富集量,接菌处理组紫花苜蓿地上部和地下部钼含量均显著低于未接菌处理组,其富集因子显著降低,表明接种钼还原菌株后减少了紫花苜蓿对土壤中钼的吸收和转运。【结论】钼还原菌株M9和M13具有显著的植物促生特性,能够促进紫花苜蓿在钼污染土壤中的生长,并降低其钼含量。本研究为揭示微生物强化植物钼修复的机制以及促进植物-微生物联合修复钼污染土壤的相关研究提供了参考。

钼  /  植物内生细菌  /  促生特性  /  紫花苜蓿  /  联合修复

[Objective] The rhizosphere microorganism-plant combined approach has high application potential for the remediation of heavy metal-contaminated soil. This study observed the effects of adding exogenous plant growth-promoting bacteria (PGPB) on the growth and molybdenum (Mo) accumulation of alfalfa (Medicago sativa), aiming to provide theoretical references for plant-microbial remediation of Mo-contaminated soil. [Methods] The endophytic bacteria were isolated from dominant plants of Mo tailing and they were identified based on morphological characteristics and molecular evidence. The plant growth-promoting (PGP) properties of molybdate-reducing strains were determined. By adding exogenous PGPB into the soil, we investigated the effects of adding exogenous PGPB on the biomass, physiological activity, and Mo accumulation of alfalfa. [Results] Two molybdate-reducing strains M9 and M13 were obtained and identified as Serratia plymuthica based on morphological characteristics, 16S rRNA gene sequence, and gyrB sequence. M9 and M13 had the abilities to fix nitrogen, solubilize phosphorus, solubilize potassium, and secrete indole-3-acetic acid (IAA), siderophores, and 1-amino cyclopropane-1-carboxylic acid (ACC) deaminase. Under Mo stress, the inoculation of M9, M13, and M9+M13 significantly promoted the growth of alfalfa, increasing the plant height, root length, and fresh weight of alfalfa compared with the non-inoculation control group. At the same time, the inoculation increased the chlorophyll content and peroxidase (POD) activity while decreasing the malondialdehyde (MDA) content in alfalfa. M9 and M13 significantly affected the Mo accumulation of alfalfa. The Mo content in the above-ground and under-ground parts of alfalfa inoculated with M9, M13, and M9+M13 significantly decreased compared with that in the non-inoculation control group. The decreased enrichment factor of Mo in alfalfa indicated that inoculation with molybdate-reducing strains reduced the uptake and transport of Mo in alfalfa. [Conclusion] The molybdate-reducing strains M9 and M13 can promote the growth and reduce the Mo content of alfalfa in Mo-contaminated soil. This finding can provide theoretical reference for revealing the mechanism of microbial-enhanced Mo remediation by plants as well as the joint remediation of Mo-contaminated soil by plants and microorganisms.

molybdenum  /  endophytic bacteria of plant  /  plant growth-promoting properties  /  Medicago sativa  /  joint remediation by plants and microorganisms
杨瑞先, 刘萍, 石犇, 王小庆, 乔翠翠, 肖静尧, 杨沛霖, 田文杰. 钼还原促生菌的筛选及对紫花苜蓿钼吸收的调控作用. 微生物学报, 2025 , 65 (5) : 1995 -2013 . DOI: 10.13343/j.cnki.wsxb.20240683
Ruixian YANG, Ping LIU, Ben SHI, Xiaoqing WANG, Cuicui QIAO, Jingyao XIAO, Peilin YANG, Wenjie TIAN. Screening of molybdate-reducing bacteria capable of promoting the growth and regulating the molybdate uptake of Medicago sativa[J]. Acta Microbiologica Sinica, 2025 , 65 (5) : 1995 -2013 . DOI: 10.13343/j.cnki.wsxb.20240683
钼(molybdenum, Mo)是动植物生长必需的营养元素,同时也是重要的战略资源,在钢铁、石油、化工及航天航空等行业被广泛应用[1]。然而,随着钼矿及伴生钼矿的开采,土壤钼污染问题日益严峻[2]。我国钼矿资源约占全球钼矿资源的1/4,其中河南省钼矿资源最为丰富,占全国钼矿总储量的30.01%,目前调查发现河南钼矿区周边土壤中钼含量(均值784 mg/kg)已远高于我国土壤钼含量背景值(2 mg/kg),土壤污染情况相当严重,钼污染已成为钼矿区周边土壤中较为显著的生态环境问题[3-4]。杨自军等[5]研究发现,土壤钼污染可通过食物链的传递威胁动物及人体健康,当饲料中钼含量大于10 mg/kg时,动物尤其是反刍动物会出现腹泻等中毒症状。在河南土壤高钼区域,牛、羊等反刍动物均表现出以腹泻为主要特征的钼中毒症状;此外,土壤钼污染也可引起作物可食部位钼水平的大幅提高,从而影响人类对钼的吸收,导致人体内钼含量的积累,过量的钼对人体健康危害极大,能诱发心肌坏死、肾结石、尿道结石及痛风等疾病[6-7]。目前,与钼污染土壤关键修复技术相关的研究较少,尤其是与钼超积累植物筛选、钼还原微生物筛选及钼还原机制等方面的研究鲜有报道。因此,加强这一领域的研究对于解决土壤钼污染问题具有重要意义。
用于重金属污染土壤修复的方法主要包括物理修复、化学修复和植物修复。物理和化学修复技术成本较高,且易改变土壤性质并对土壤微生物群落产生负面影响,甚至可能导致二次污染[8]。植物修复法因其原位、环保、成本低等特点成为去除土壤中重金属的主要修复方式[9]。例如,段桂兰等[10]报道伴矿景天、东南景天、商陆、龙葵等植物均对镉(cadmium, Cd)具有较强的富集能力,其地上部分的镉浓度可以达到400 mg/kg。蜈蚣草对砷(arsenic, As)具有超强的富集能力,其地上部砷的浓度可达生物量的1%以上,蜈蚣草吸收的砷能在其根部被高效还原,并转运到地上部的羽叶中储存[11]。这些超富集植物被认为是修复重金属污染土壤的理想选择,尤其是豆科植物紫花苜蓿(Medicago sativa),因其生长快、生物量大、适应性强等特点,近年来被广泛应用于土壤中镉、锌、铜、铬等重金属的污染修复[12-13]。然而,关于紫花苜蓿对土壤钼污染的修复特性的相关报道极少。
微生物与植物联合修复技术是目前治理土壤重金属污染物的有效手段之一,尤其是外源添加植物内生菌强化植物修复作用的方法应用广泛[14-15]。万勇[16]从镉的超富集植物龙葵(Solanum nigrum)中分离筛选出一株内生贪噬菌属(Variovorax paradoxus)菌株DE5,该菌株耐受镉的浓度可达200 mg/L,与对照组相比,接种DE5的青葙根部生物量显著增加,其对镉的富集能力显著提高。Li等[17]将一株内生肠杆菌属(Enterobacter sp.)菌株K3-2接种到苏丹草中,显著增加了苏丹草的生物量和体内铜的积累量,其对铜的吸收量与未接种内生菌相比,从49%增加到95%。因此内生菌协同超积累植物作为一种新兴的重金属污染土壤修复技术,凭借其稳定的生存环境和独特的生理特性,展现出极大的应用潜力。
本研究以钼还原内生菌和紫花苜蓿为研究对象,探究钼污染地区优势植物内生菌的钼还原能力和植物促生特性,以及外源添加钼还原促生内生菌后对紫花苜蓿生长量、钼富集能力及生理活性的影响。研究结果可为深入理解钼还原促生菌对紫花苜蓿生长和钼吸收的影响提供理论指导,并有助于促进紫花苜蓿-微生物联合修复钼污染土壤的相关研究,为未来构建植物-钼还原微生物修复体系提供微生物资源,对钼污染农田土壤生物修复技术的发展具有重要的研究价值和实际意义。
2022年采集河南省栾川县某钼尾矿区(钼浓度96.83 mg/kg)的优势植物高羊茅(Festuca elata)。采集植物全株,装入采样袋并做好标记,样品放入冰盒中带回实验室,保存于4 ℃冰箱中。供试盆栽植物紫花苜蓿(Medicago sativa)种子购自洛阳市新村花卉市场。
NB培养基 (g/L):牛肉膏3.0,蛋白胨10.0,氯化钠5.0,pH 7.0。
NA培养基 (g/L):牛肉膏3.0,蛋白胨10.0,氯化钠5.0,琼脂15.0,pH 7.0。
低磷酸盐 (low phosphate agar medium, LPM)培养基[18](g/L):葡萄糖10.0,硫酸铵3.0,七水合硫酸镁0.5,氯化钠5.0,酵母提取物0.5,二水合钼酸钠2.4,磷酸氢二钠0.5,pH 7.0。
采用表面消毒法分离耐钼内生细菌。具体步骤如下:取清洗干净的高羊茅根部组织5 g,用75%乙醇消毒30 s,5%次氯酸钠消毒3 min,无菌水漂洗5次后,用无菌滤纸吸干水分。将根部组织放入无菌研钵中,加入15 mL无菌水,充分研磨后静置15 min,取100 μL上清液涂布于LPM固体培养基上,30 ℃培养72 h,挑选蓝色菌落进行纯化培养[19]。纯化后的细菌接种于NB培养基中,30 ℃、200 r/min培养24 h,测量菌液的OD600值。以2%的接种量将OD600值为1.0的菌悬液接种于LPM液体培养基中,30 ℃、200 r/min培养72 h后,吸取2 mL培养液,4 °C、10 000 r/min离心10 min,收集上清液,测定865 nm处钼蓝的吸光度值。
观察NA培养基上耐钼内生细菌菌株的菌落特征,并进行革兰氏染色,观察细菌的微观形态特征,具体方法参考文献[20]。
采用细菌基因组DNA提取试剂盒(北京索莱宝生物技术有限公司)提取耐钼内生细菌菌株的基因组DNA,具体步骤参照试剂盒说明书。利用细菌通用引物27F (5′-AGAGTTTGATCCT GGCTCAG-3′) 和 1429R (5′-CGGCTACCTTGT TACGAC-3′) 对16S rRNA基因序列进行扩增;利用引物 UP-1 (5′-GAAGTCATCATGACCGTT CTGCAYGCNGGNGGNAARTTYGA-3′) 和 UP-2r (5′-AGCAGGGTACGGATGTGCGAGCCRTC NACRTCNGCRTCNGTCAT-3′) 扩增促螺旋酶基因 (gyrB)。 具体扩增体系及程序参考文献[21]。 扩增产物经1%琼脂糖凝胶电泳检测后, 送至生工生物工程(上海)股份有限公司进行测序。 将获得的16S rRNA基因序列和gyrB基因序列分别与NCBI GenBank数据库中的已知序列进行BLASTn比对, 并采用MEGA 7.0构建系统发育树, 明确菌株的分类地位。
将保存的内生细菌菌株接种于NA培养基,30 ℃预培养12 h后进行固氮、溶磷、解钾、产吲哚-3-乙酸(indole-3-acetic acid, IAA)、产铁载体及1-氨基环丙烷-1-羧酸(1-amino cyclopropane-1-carboxylic acid, ACC)脱氨酶活性的测定。
固氮能力测定:将待测菌株接种于阿须贝无氮培养基(Ashby培养基)[22],28 ℃培养3 d后观察生长状况。溶磷能力测定:将待测菌株点接于PKO无机磷培养基和孟金娜有机磷培养基[23],28 ℃培养3 d后观察菌落周围透明圈的产生情况,并测量溶磷圈直径(D)和菌落直径(d),计算溶磷指数(D/d)。解钾能力测定:将待测菌株点接于解钾培养基[24],28 ℃培养3 d后观察菌落生长状况。产铁载体能力测定:将待测菌株点接于铬天青检测培养基(CAS培养基)[25],28 ℃培养5 d后观察菌落周围橙色晕圈的产生情况,测量橙色晕圈直径(D)和菌落直径(d),计算D/d值。ACC脱氨酶活性测定:将待测菌株接种于5 mL DF无氮液体培养基中,30 ℃、200 r/min振荡培养24 h;取0.1 mL培养液分别接种于5 mL DF培养基和ADF培养基中[26],30 ℃、200 r/min培养48 h,观察菌株在2种培养基中的生长情况。产IAA能力测定:采用Salkowski’s显色法测定待测菌株产IAA的能力[27]。具体方法为:将待测菌株接种于5 mL金氏(King)液体培养基中,28 ℃、120 r/min培养3 d后,10 000 r/min离心10 min,取3 mL上清液滴于白色陶瓷板中,加入等体积Salkowski比色液,室温黑暗放置30 min后观察颜色变化。
采集洛阳市某村庄农耕田0-20 cm表层土作为供试土壤,去除土壤中的杂物,风干后磨碎,160 ℃消毒2 h。采用土壤:珍珠岩为7:3比例混合均匀,分装于塑料花盆中(直径17 cm,高16 cm),每盆分装1.5 kg。盆土pH值为7.2,总钼含量为0.22 mg/kg。将配制好的钼酸钠溶液加入供试土样中,与盆土混合均匀,使盆土中钼浓度(以Mo6+计)分别为500 mg/kg和800 mg/kg,以不加钼酸钠的盆土为对照(钼处理浓度记为0 mg/kg),盆土室温静置老化14 d后备用。
老化后的盆土浇入500 mL无菌水,播入消毒后的紫花苜蓿种子,每盆播种30颗种子。盆栽试验设置4个处理,分别为紫花苜蓿+无菌水、紫花苜蓿+M9、紫花苜蓿+M13、紫花苜蓿+M9+M13 (菌株按体积比1:1进行复配),每个处理分别设置3个钼浓度(0、500、800 mg/kg),盆栽试验共包含12个处理,每处理6个重复。种植方法为:紫花苜蓿播种当天每盆浇灌细菌菌液20 mL (菌液浓度为108 CFU/mL),之后每隔15 d浇灌1次细菌菌液,以无菌水浇灌作为对照,75 d后收获紫花苜蓿植株。整个培养期在顶部透光的日光温室中进行(温度20-25 ℃,相对湿度70%)。
收集各处理组紫花苜蓿植株,用自来水冲洗干净后,再用蒸馏水冲洗,用乙二胺四乙酸钠(EDTA-Na)溶液浸泡20 min以去除根系表面吸附的钼酸根离子,最后用纯净水冲洗干净,滤纸吸干水分。随机挑取各处理组紫花苜蓿10株,分别测量植株的株高、根长和鲜重。
紫花苜蓿收获前1天,采集相同叶龄的叶片测定各处理组紫花苜蓿植株中叶绿素含量、丙二醛(malondialdehyde, MDA)含量和过氧化物酶(peroxidase, POD)活性。叶绿素含量采用95%乙醇法测定[28],MDA含量采用硫代巴比妥酸法测定[29],POD活性采用愈创木酚法测定[30]
按照五点取样法于10-15 cm土层处均匀取样,将盆土样品按不同浓度和不同处理分别混匀后作为后续测量样品,种植前与种植后的盆土取样方法一致。分别测定紫花苜蓿种植前和种植后土壤中有效态钼含量。土壤中有效态钼按照农业土壤中有效态的标准提取方法(NY/T 1121.9—2012)[31]进行提取。具体方法如下:分别精确称取3.0 g风干土壤样品,置于250 mL三角瓶中,加入30 mL Tamm溶液(每升溶液含12.6 g草酸+24.9 g草酸铵),220 r/min振荡30 min后静置过夜,5 000 r/min离心5 min后取上清液。消解方法按照《中华人民共和国国家环境保护标准HJ678—2013》[32]进行,消解液中钼含量采用ICP-MS (Agilent 7800)测定。
将收集的各处理组紫花苜蓿根、茎、叶分开,全株与植物组织于105 ℃杀青30 min后,70 ℃烘干至恒重,烘干样品磨碎后过筛,用HNO3-HClO4法进行消解,消解液中钼含量采用ICP-MS测定,并计算紫花苜蓿钼富集因子(enrichment factor, BCF)和转运系数(transport coefficient, TA)。计算公式如(1)和(2)所示。
富集因子=Ap/As
式中:Ap为植物中钼含量(mg/kg);As为土壤中剩余钼含量(mg/kg)。
转运系数=Au/Ad
式中:Au植物地上部分钼含量(mg/kg);Ad为植物地下部分钼含量(mg/kg)。
数据采用Excel 2016软件整理,采用SPSS 26.0进行单因素方差分析和Duncan多重比较,以分析差异显著性。
从高羊茅根部组织中分离获得12株具有钼还原能力的内生细菌菌株,分别命名为M1、M2、M3、M4、M5、M6、M9、M10、M11、M12、M13和M14,12株细菌分离物在LPM平板上均呈现深蓝色(图1)。以LPM液体培养基为对照,测定12个菌株在865 nm处的钼蓝吸收值,以判断不同菌株的钼蓝产量,从而确定其钼还原能力。钼蓝吸收值越高,表明菌株的钼蓝产量越高,钼还原能力越强。结果显示,12株细菌在LPM液体培养基中培养72 h后,菌株M9在865 nm处的钼蓝吸光度值最大,为2.54±0.15;其次为菌株M13,吸光度值为1.64±0.01,与其他菌株的钼蓝吸光度值存在显著差异(表1)。此外,菌株M9和M13在持续培养168 h后,仍保持较高的钼蓝产量。利用紫外分光光度计对菌株M9和M13所产钼蓝的吸收光谱(400-900 nm)进行扫描,发现2个菌株产生的钼蓝具有独特的吸收特性,在865 nm处出现吸光度峰值,在700 nm处出现肩峰(图2)。结果表明,不同菌株的钼还原能力存在差异,菌株M9和M13在LPM培养基中表现出较高的钼蓝产量和较强的钼还原能力。因此,本研究选择菌株M9和M13作为钼还原菌株进行后续试验。
菌株M9和M13在NA培养基上呈现乳白色,菌落圆形,边缘整齐,表面湿润。革兰氏染色结果显示,2株细菌均为革兰氏阴性菌,呈短杆状(图3)。通过PCR扩增菌株M9和M13的16S rRNA基因序列,分别获得1 437 bp的片段序列,GenBank登录号分别为PQ333149和PQ333150。同时,PCR扩增菌株M9和M13的gyrB基因,分别获得1 192 bp和1 203 bp的片段序列,GenBank登录号分别为PQ365717和PQ365716。利用NCBI的BLASTn工具对菌株M9和M13的16S rRNA基因序列和gyrB基因序列进行比对,筛选出与其序列相似性高达99%的菌株。进一步利用MEGA 7.0软件,通过邻接法(neighbor-joining method)构建系统发育树(图4A4B),并基于1 000次重复的bootstrap值进行置信度分析。结果显示,菌株M9和M13的16S rRNA基因序列及gyrB基因序列均与普利茅斯沙雷氏菌(Serratia plymuthica)聚为一类,结合形态学特征和分子生物学特征,将菌株M9和M13鉴定为普利茅斯沙雷氏菌(S. plymuthica)。
钼还原内生细菌菌株M9和M13的促生特性测定结果表明,2个菌株均能在固氮培养基中生长(图5A),表明它们具有固氮能力。2个菌株在无机磷培养基上均形成了半透明的解磷圈(图5B),菌株M9和M13的溶磷圈与菌落直径比值(D/d)分别为1.35±0.12和1.73±0.14,说明2个菌株均具有良好的无机磷溶解能力,且菌株M13的能力优于菌株M9。在孟金娜有机磷培养基上,2个菌株也形成了半透明的解磷圈(图5C),菌株M9和M13的溶磷圈与菌落直径比值(D/d)分别为2.57±0.69和1.76±0.30,表明它们均具有良好的有机磷溶解能力,且菌株M9的能力优于菌株M13。菌株M9和M13在硅酸盐细菌培养基上均能生长,呈现油滴状,表明2个菌株均具有一定的解钾能力(图5D)。在CAS培养基上,菌株M9和M13均产生了橙黄色透明圈(图5E),其透明圈与菌落直径比值(D/d)分别为1.52±0.19和1.41±0.07,表明它们均具有产铁载体的能力,且菌株M9边缘透明圈较大,表明M9产铁载体能力优于菌株M13。在ADF液体培养基中,2个菌株均能正常生长,培养液呈现浑浊状态(图5F),培养48 h后,其在600 nm处的吸光度值分别为0.289和0.234,表明2个菌株均具有产ACC脱氨酶活性。将菌株M9和M13的发酵上清液与Salkowski比色液混合后,混合液均呈现粉红色,表明2个菌株具有一定的产IAA能力(图5G)。
通过测量不同处理条件下紫花苜蓿的株高、根长和鲜重,分析钼还原菌株M9和M13对紫花苜蓿的促生作用。如表2所示,菌株M9和M13对紫花苜蓿的株高、根长、鲜重产生了显著的影响。在不添加Mo6+的条件下,接种菌株M9的处理组,紫花苜蓿的株高、根长和鲜重分别比对照组增加了3.21%、11.81%和36.36%,差异显著(P<0.05)。接种菌株M13的处理组,紫花苜蓿的株高、根长和鲜重分别比对照组增加了3.71%、12.33%和45.45%,差异显著(P<0.05)。接种复配菌株M9+M13的处理组,紫花苜蓿的株高、根长和鲜重分别比对照组增加了13.67%、26.59%和91.48%,差异显著(P<0.05) (图6A),表明菌株M9和M13对紫花苜蓿具有显著的促生作用,且复配菌株的促生效果优于单一菌株。
表2所示,在添加Mo6+的条件下,随土壤中钼离子浓度的增加,紫花苜蓿的株高、根长和鲜重均呈下降趋势。当土壤钼浓度为800 mg/kg时,紫花苜蓿的株高、根长和鲜重显著低于0 mg/kg和500 mg/kg处理组(P<0.05),表明钼胁迫对紫花苜蓿的生长具有显著抑制作用,且钼浓度越高,抑制作用越强。在相同钼处理浓度下,接种钼还原菌株处理组,紫花苜蓿的株高、根长和鲜重显著高于未接种对照组。当钼浓度为500 mg/kg时,菌株M9的处理组,紫花苜蓿的株高、根长和鲜重分别增加了24.09%、17.39%和24.63% (P<0.05);菌株M13处理组分别增加了25.11%、18.15%和39.13% (P<0.05);复配菌株M9+M13处理组分别增加了30.89%、19.33%和59.42% (P<0.05) (图6B)。当钼浓度为800 mg/kg时,M9处理组紫花苜蓿的株高、根长和鲜重分别增加了16.58%、9.33%和29.53% (P<0.05);菌株M13处理组分别增加了18.91%、10.04%和32.89% (P<0.05);复配菌株M9+M13处理组分别增加了17.91%、12.14%和53.78% (P<0.05) (图6C)。结果表明钼还原菌株能够显著促进紫花苜蓿的生长,提高其生物量,并有效缓解高浓度钼对紫花苜蓿生长的抑制作用。
通过测定不同处理条件下紫花苜蓿的叶绿素含量、POD活性和MDA含量,分析钼还原菌株对紫花苜蓿叶绿素合成及抗氧化酶活性的影响。如图7所示,菌株M9和M13对紫花苜蓿的叶绿素含量、POD活性和MDA含量均产生了显著影响。在不添加Mo6+的条件下,与未接菌对照组相比,菌株M9和复配菌株M9+M13均提高了紫花苜蓿的叶绿素含量,分别提高了19.19%和51.29%,差异显著(P<0.05)。菌株M13与对照差异不显著,复配菌株M9+M13对紫花苜蓿叶绿素含量的提升效果更为显著,推测这与其促生作用密切相关。此外,菌株M9、M13和复配菌株M9+M13均显著提高了紫花苜蓿POD的活性,与未接菌对照组相比,其POD活性提高了8.85%、7.80%和61.40%,差异显著(P<0.05),表明接种钼还原菌株可诱导紫花苜蓿抗氧化酶活性的增强。同时,钼还原菌株对紫花苜蓿MDA含量也产生了一定的影响,菌株M9和复配菌株M9+M13增加了MDA的含量,菌株M13与对照差异不显著。
图7所示,在添加Mo6+条件下,随土壤中钼浓度的增加,紫花苜蓿的叶绿素含量下降,POD活性显著增加,而MDA含量逐渐降低,表明土壤钼胁迫对紫花苜蓿的生理活性具有一定的影响。当钼浓度为500 mg/kg时,接种菌株M9、M13和M9+M13的紫花苜蓿叶绿素含量均高于未接菌对照组,其含量分别提高了33.70%、87.61%和59.89%;POD活性分别增加了6.40%、42.67%和5.09%;MDA含量分别提高了9.49%、21.14%和7.05%,差异显著(P<0.05)。在钼浓度为800 mg/kg时,接种菌株M9、M13和M9+M13的紫花苜蓿叶绿素含量均高于未接菌对照组,其含量分别提高了57.65%、44.90%和95.40%;POD活性分别增加了33.03%、22.30%和4.20%,差异显著(P<0.05),但MDA含量与对照组相比差异不显著。
钼还原菌株与紫花苜蓿联合修复对土壤钼含量的影响如表3所示,土壤钼浓度随外源钼含量的增加而增加。接种钼还原菌株后对土壤中总钼含量和有效态钼含量均产生显著影响,总体呈现降低趋势。当钼浓度为500 mg/kg时,接种M13菌株后,土壤总钼含量由222.33 mg/kg降至147.29 mg/kg,有效态钼含量由51.30 mg/kg降至41.22 mg/kg。当钼浓度为800 mg/kg时,接种M9+M13复合菌株后,土壤总钼含量由381.22 mg/kg降至221.42 mg/kg,有效态钼含量由85.45 mg/kg降至63.40 mg/kg。结果表明,接种菌株M9和M13显著降低了紫花苜蓿根际土壤中钼的含量,表明钼还原菌株联合紫花苜蓿显著可有效降低土壤中钼的含量。
钼还原菌株对紫花苜蓿地上部和地下部钼含量的影响如表4所示,随土壤中钼浓度的增加,紫花苜蓿接菌组和未接菌组,其地上部和地下部钼含量均呈现增加趋势。在钼胁迫条件下,接种钼还原菌株后对紫花苜蓿地上部和地下部钼含量均显著低于未接菌组。尤其是接种菌株M9后,紫花苜蓿地上部和地下部钼含量显著降低,与对照组差异显著。当钼浓度为500 mg/kg时,接种M9菌株后,紫花苜蓿地下部钼浓度由461.63 mg/kg降至342.17 mg/kg,地上部钼浓度由489.78 mg/kg降至353.50 mg/kg。当钼浓度为800 mg/kg时,接种M9菌株后,紫花苜蓿地下部钼浓度由732.95 mg/kg降至533.86 mg/kg,地上部钼浓度由762.95 mg/kg降至516.08 mg/kg。结果表明,菌株M9和M13对紫花苜蓿中钼的积累表现为抑制作用,说明钼还原菌株强化紫花苜蓿生长伴随着钼的“稀释效应”进行。
钼还原菌株对紫花苜蓿钼富集因子和转运系数的影响如表4所示,接菌组和未接菌组紫花苜蓿的富集因子均大于1,表明其对钼具有良好的富集能力,可将土壤中的钼有效转移至植物体内。然而,随着土壤钼浓度的增加,紫花苜蓿的富集因子显著降低,表明高浓度钼降低了其对钼的吸收效率。在钼胁迫条件下,接种菌株M9、M13和复配菌株M9+M13后,紫花苜蓿的富集因子和转运系数均显著降低,表明接种钼还原菌株减少了紫花苜蓿对土壤钼的吸收和转运。菌株M9和M13对紫花苜蓿钼的富集表现出显著的抑制作用,但接种菌株有利于土壤钼的去除及其向稳定态转化。
本研究从钼尾矿区优势植物高羊茅中筛选获得2株具有较强钼还原能力的菌株M9和M13。通过形态学特征及16S rRNA基因序列和gyrB基因序列的综合分析,鉴定其均为普利茅斯沙雷氏菌(Serratia plymuthica)。菌株M9和M13在865 nm处的钼蓝吸光度值分别为2.54±0.15和1.64±0.01,表明这2个菌株能够将钼酸钠(Mo6+)还原为钼蓝,具有修复土壤钼污染的应用潜力。目前,研究者已从钼污染土壤和水源中分离获得了多株钼还原细菌,如肠杆菌属(Enterobacter sp.)菌株Dr. Y13、沙雷氏菌属(Serratia sp.)菌株HMY1和MIE2、芽孢杆菌属(Bacillus sp.)菌株LM4-2、柔武氏菌属(Raoultella sp.)菌株Mo1、克雷伯氏菌属(Klebsiella sp.)菌株Aft-7等,分别归属细菌12个属[33-38]。其中沙雷氏菌属是一类被频繁筛选获得的钼还原细菌,表明该属细菌可作为钼污染修复菌用于土壤修复。本研究获得的2株细菌也归于沙雷氏菌属,且属于首次从植物体内分离获得的具有钼还原能力的内生菌。植物内生菌(endophytic bacteria)定殖于植物组织内,生存环境稳定,在外界生物因素或非生物因素的胁迫下对植物表现出明显的促生作用,因此在植物-微生物联合修复重金属土壤中被广泛应用[39]。例如,Singh等[40]研究发现,在砷胁迫条件下,接种菌株缺陷短波单胞菌(Brevundimonas diminuta)后,可显著促进水稻(Oryza sativa)的生长,增加植物生物量并提高其对砷胁迫环境的耐受性。Petriccione等[41]研究发现,接种荧光假单胞菌(Pseudomonas fluorescens) AA27和MO49后,除有效提高紫茉莉(Mirabilis jalapa)种子在重金属污染土壤中的萌发率、增加植株生物量外,还显著促进了镉、铜等重金属在紫茉莉根际的累积。Li等[17]将一株肠杆菌属(Enterobacter sp.)细菌K3-2接种于苏丹草中,可有效增加植物的生物量和植物体内Cu2+的积累量,与未接菌对照组相比,接菌植物对Cu2+的吸收量从49%提升至95%。Babu等[42]从樟子松根中分离获得一株内生苏云金芽孢杆菌(Bacillus thuringiensis) GSB-1,该菌株可以产生促进植物生长的因子,并提升去除潜在有毒金属的效果,将菌株GSB-1植入宿主植物体内后,植物幼苗的叶绿素含量、生物量以及铜、砷、镍、锌和铅等重金属的提取效果均有所增加。目前,利用植物内生菌强化钼污染土壤修复的研究报道极为少见,本研究获得的2株内生菌接种紫花苜蓿后,有效增加了紫花苜蓿的生物量,并显著降低了紫花苜蓿对土壤钼的吸收和转运,表明植物内生菌可为钼污染修复生物强化方案的制订提供新思路和新参考。
在植物-微生物协同修复系统中,内生菌强化植物修复机制主要通过2方面实现,一是直接或间接降低植物体内重金属胁迫强度;二是对植物的表型产生影响,提高植物本身对重金属的耐受性[43]。在植物体内,内生菌可通过胞内氧化还原作用或弱作用力改变重金属的价态和存在形式,将重金属离子转化为生物毒性更小的存在形式,从而降低高浓度重金属对植物的毒害作用[44]。例如,Xu等[45]将1株内生菌纳斯达短波单胞菌(B. nasdae) W1-2B接种到蜈蚣草(Eremochloa ciliaris)后发现,As3+被氧化为As5+,抑制了蜈蚣草对As3+的吸收。Jong等[46]从硒超积累植物沙漠王羽(Stanleya pinnata)中分离获得1株内生细菌,该菌株对土壤中的硒酸盐(SeO42-)和亚硒酸盐(SeO32-)具有较强的氧化还原能力,能将其分解为单质硒,有效降低了土壤中亚硒酸盐的含量,提高了植物的修复效率。在pH值为7.0的条件下,钼在土壤中主要以MoO42-形式存在,而具有钼还原活性的细菌在一定条件下产生钼还原酶,在钼还原酶的作用下细菌可将Mo6+还原转化为Mo5+,最终将MoO42-转化为无毒性的钼蓝,改变其原来的存在形态,降低其在环境中的生物有效性,从而降低钼对植物的胁迫[47]。本研究发现,内生细菌M9和M13对紫花苜蓿根际土壤中总钼和有效态钼含量产生了一定的影响,与未接菌的根际土壤相比,其总钼含量和有效态钼含量均有下降。同时,在钼胁迫条件下,接种钼还原菌株后紫花苜蓿地上部和地下部的钼含量均显著低于未接菌对照组。结果表明,2株钼还原细菌强化紫花苜蓿的修复机制是将土壤中或进入植物体内的钼离子转化为无毒性的存在形式,抑制了紫花苜蓿对钼的吸收,阻隔了其向地上部转移,降低了高浓度钼对紫花苜蓿的胁迫作用。然而,菌株M9和M13产生钼还原酶的能力及解毒机理仍需进一步研究。
内生菌强化植物修复机制的另一方面主要体现在内生细菌能够促进植物光合作用、分泌铁载体、有机酸、表面活性剂、固氮酶、ACC脱氨酶和植物生长激素等物质,可以改善植物营养,促进植物生长,增加重金属胁迫条件下的植物生物量,从而提高植物修复的效率[48]。Mirzahossini等[49]将接种了内生菌Epichloe coenophiala的高羊茅(Festuca arundinacea)放置于含高浓度镍环境中,与未接种内生菌对照组相比,接种内生菌植株叶绿素含量显著提高。Zhang等[50]从超富集植物美洲商陆(Phytolacca americana)的根、茎和叶中分离出耐铜内生细菌,其中菌株Ralstonia sp. J1-22-2、成团泛菌(Pantoea agglomerans) Jp3-3和赛维瓦尔假单胞菌(P. thivervalensis) Y1-3-9具有多种促植物生长特征,表现出较高的ACC脱氨酶活性,能够产生铁载体和吲哚乙酸,并可溶解无机磷酸盐,其接种后可显著促进欧洲油菜(Brassica napus)的生长,并提高了欧洲油菜对铜的耐受性。此外,一株分离自玉米(Zea mays)组织的耐镉内生细菌Rahnella sp. JN27,能够分泌吲哚乙酸和铁载体,具有ACC脱氨酶活性和溶磷能力,接种千穗谷(Amaranthus hypochondriacus)、苋菜(A. mangostanus)、龙葵(Solanum nigrum)和玉米等植物后,可显著提高这些植物地上部和地下部的生物量[51]。本研究获得的2株内生细菌M9和M13具有固氮、溶磷、解钾、产IAA、铁载体及ACC脱氨酶的能力,接种紫花苜蓿后,能够显著提高紫花苜蓿的生物量,表明这2株内生细菌强化紫花苜蓿修复钼污染的机制与促进紫花苜蓿的生长密切相关。
内生细菌强化植物修复机制除了通过直接促进植物生长外,还可通过诱导植物产生系统抗性,间接提高植物对土壤重金属的耐受性[52-53]。植物在受到重金属胁迫后,会造成活性氧(reactive oxygen species,ROS)大量累积,如过氧化氢(hydrogen peroxide, H2O2)等,从而对植物造成较大危害。内生细菌作为植物的有益共生菌,能够调节宿主植物的抗氧化酶活性。当植物接种内生细菌后,植物体内的超氧化物歧化酶(superoxide dismutase, SOD)、过氧化氢酶(catalase, CAT)和POD等抗氧化酶活性显著增强,有效减轻了重金属胁迫对植物造成的危害[54]。Wan等[55]研究表明,在10 μmol/L和50 μmol/L镉浓度条件下,接种嗜线虫沙雷氏菌(S. nematodiphila) LRE07后,龙葵叶片中的SOD活性显著高于未接菌组,有效抵御了重金属引起的氧化胁迫,减轻了重金属对植物的毒害程度[。丙二醛(MDA)含量也是植物受逆境胁迫程度的重要指标之一,过量MDA可破坏植物组织的渗透压平衡和细胞膜结构,改变细胞液的pH值[56]。王立等[57]发现,在镉污染条件下,接种丛枝菌根真菌摩西球囊霉(Glomus mosseae)和根内球囊霉(G. intraradice)后,水稻叶片中MDA含量显著降低,而SOD活性和脯氨酸含量显著提高。本研究结果表明,在钼胁迫条件下,紫花苜蓿接种钼还原菌株M9和M13后,其叶片中POD活性增加,MDA含量下降,表明这2株内生细菌可诱导紫花苜蓿产生系统抗性,间接提高其对土壤钼污染的耐受性,减轻高浓度钼对紫花苜蓿的胁迫作用。
根据本研究结果及讨论,推测菌株M9和M13促进紫花苜蓿协同修复钼污染的机制主要包含2个方面:一是菌株自身可产生钼还原酶将土壤或植物体内的Mo6+还原转化为无毒性的钼蓝,有效降低紫花苜蓿根际土壤中总钼和有效态钼含量,抑制紫花苜蓿对钼的吸收,降低紫花苜蓿地上部和地下部钼的含量;二是菌株自身具有促生长特性,能够有效提高紫花苜蓿在钼污染土壤中的生长量,改善钼污染胁迫下紫花苜蓿的生理活性指标,提升紫花苜蓿对钼污染的耐受性,减轻钼污染的胁迫作用。本研究为土壤钼污染修复提供了微生物-植物联合修复体系,并探讨了微生物强化植物修复的机制,对土壤钼污染修复具有一定的理论参考意义。
  • 河南省科技攻关项目(232102320111)
  • 河南省自然科学基金(242300421332)
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2025年第65卷第5期
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doi: 10.13343/j.cnki.wsxb.20240683
  • 接收时间:2024-11-04
  • 首发时间:2026-02-05
  • 出版时间:2025-05-04
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  • 收稿日期:2024-11-04
  • 录用日期:2024-12-22
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Science and Technology Research Project of Henan Province(232102320111)
河南省科技攻关项目(232102320111)
Natural Science Foundation of Henan Province(242300421332)
河南省自然科学基金(242300421332)
作者信息
    1.洛阳理工学院 环境工程与化学学院,河南 洛阳
    2.河南省绿色建筑材料制造与智能装备重点实验室,河南 洛阳
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2种不同金属材料的力学参数

Family
属数
Number of
genus
种数
Number of
species
占总种数比例
Percentage of
total species (%)

Genus
种数
Number of
species
占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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