Article(id=1241783830890218175, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241783822560334490, articleNumber=null, orderNo=null, doi=10.13343/j.cnki.wsxb.20240168, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=research-article, receivedDate=1710777600000, receivedDateStr=2024-03-19, revisedDate=null, revisedDateStr=null, acceptedDate=1717344000000, acceptedDateStr=2024-06-03, onlineDate=1773993936512, onlineDateStr=2026-03-20, pubDate=1717516800000, pubDateStr=2024-06-05, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1773993936512, onlineIssueDateStr=2026-03-20, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1773993936512, creator=13701087609, updateTime=1773993936512, updator=13701087609, issue=Issue{id=1241783822560334490, tenantId=1146029695717560320, journalId=1192105938417971205, year='2024', volume='64', issue='9', pageStart='3091', pageEnd='3558', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1773993934526, creator=13701087609, updateTime=1773994132256, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1241784651996528679, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241783822560334490, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1241784651996528680, tenantId=1146029695717560320, journalId=1192105938417971205, issueId=1241783822560334490, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=3506, endPage=3520, ext={EN=ArticleExt(id=1241783832505025230, articleId=1241783830890218175, tenantId=1146029695717560320, journalId=1192105938417971205, language=EN, title=Role of CbrB in the biocontrol strain Pseudomonas protegens Pf-5, columnId=1241045257748533520, journalTitle=Acta Microbiologica Sinica, columnName=Research Articles, runingTitle=null, highlight=null, articleAbstract=

[Objective] To explore the effects of CbrB from the carbon catabolite repression system on the biocontrol performance of Pseudomonas protegens Pf-5. [Methods] The mutant Pf5274 with the markerless deletion of the coding region of cbrB was constructed by a double-crossover recombination event based on pJQ200SK. Moreover, the complementary strain of cbrB and the control strains were constructed by the plasmid complementation method based on pBBR1Am. Lastly, the effects of CbrB on the growth, biofilm formation, motility, antifungal activity, and pyoluteorin synthesis of Pf-5 were analyzed by the measurement of OD600, crystal violet staining, agar plate culture, plate confrontation method, and pltL'-'lacZ fusion report strains, respectively. [Results] CbrB greatly slowed the growth of Pf-5 in the natural medium LB, but greatly sped up the growth of Pf-5 in the basic medium M9-glucose. In addition, CbrB significantly promoted the motility but inhibited the biofilm formation, antifungal activity, and pyoluteorin synthesis of Pf-5. [Conclusion] CbrB plays a role in regulating the growth, biofilm formation, motility, antifungal activity, and pyoluteorin synthesis of P. protegens Pf-5, thus regulating the biocontrol performance of this strain. This study provides a theoretical basis for the biocontrol capabilities of strains by genetic engineering and lays a foundation for probing into the biosynthesis of pyoluteorin.

, correspAuthors=Xiaolin DONG, Daiming ZHA, authorNote=null, correspAuthorsNote=
*DONG Xiaolin, E-mail:
ZHA Daiming, E-mail:
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【目的】从基因水平探究碳分解代谢阻遏调控系统中CbrB对防御假单胞菌(Pseudomonas protegens) Pf-5生物防治能力的影响。【方法】通过基于pJQ200SK的二次同源重组法构建cbrB编码区无痕缺失突变菌株Pf5274,采用基于pBBR1Am的质粒回补法构建cbrB互补菌株及其对照菌株,通过测定菌株OD600、结晶紫染色法、琼脂平板法、平板对峙法和pltL'-'lacZ融合报告菌株,分析CbrB对防御假单胞菌Pf-5生长、生物膜形成、运动性、抗真菌活性和藤黄绿脓菌素合成的影响。【结果】CbrB在天然培养基LB中显著抑制Pf-5的生长,而在基础培养基M9-葡萄糖中则显著促进Pf-5的生长;CbrB显著促进Pf-5的运动性,但是却抑制其生物膜形成、抗真菌活性及藤黄绿脓菌素合成。【结论】CbrB在调控防御假单胞菌Pf-5生物防治方面具有一定的作用,具体表现在菌株生长、生物膜形成、运动性、抗真菌活性及藤黄绿脓菌素合成等方面。本研究为利用基因工程技术提高生防菌株生物防治能力提供理论依据,并为深度发掘藤黄绿脓菌素生物合成奠定基础。

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Pseudomonas protegens H78中抗真菌剂藤黄绿菌素的合成及其基因簇分析[J]. 基因组学与应用生物学, 2015, 34 (4):680-684., articleTitle=Pseudomonas protegens H78中抗真菌剂藤黄绿菌素的合成及其基因簇分析, refAbstract=null), Reference(id=1242902994665193645, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, doi=null, pmid=null, pmcid=null, year=2015, volume=34, issue=4, pageStart=680, pageEnd=684, url=https://www.cnki.com.cn/Article/CJFDTOTAL-GXNB2022Z1008.htm, language=null, rfNumber=[43], rfOrder=49, authorNames=null, journalName=Genomics and Applied Biology, refType=null, unstructuredReference=YANG GH, WANG Z, WU LY, ZHANG XH, HUANG XQ. The pyoluteorin (plt) biosynthesis and gene cluster analysis in Pseudomonas protegens H78[J]. Genomics and Applied Biology, 2015, 34 (4):680-684 (in Chinese)., articleTitle=The pyoluteorin (plt) biosynthesis and gene cluster analysis in Pseudomonas protegens H78, refAbstract=null), Reference(id=1242902994765856947, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, doi=10.1094/Phyto-70-712, pmid=null, pmcid=null, year=1980, volume=70, issue=8, pageStart=712, pageEnd=null, url=null, language=null, rfNumber=[44], rfOrder=50, authorNames=null, journalName=Phytopathology, refType=null, unstructuredReference=HOWELL CR. Suppression of Pythium ultimum-induced damping-off of cotton seedlings by Pseudomonas fluorescens and its antibiotic, pyoluteorin[J]. Phytopathology, 1980, 70 (8):712., articleTitle=Suppression of Pythium ultimum-induced damping-off of cotton seedlings by Pseudomonas fluorescens and its antibiotic, pyoluteorin, refAbstract=null)], funds=[Fund(id=1242902979184018212, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, awardId=31760534, language=EN, fundingSource=National Natural Science Foundation of China(31760534), fundOrder=null, country=null), Fund(id=1242902980756882223, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, awardId=31760534, language=CN, fundingSource=国家自然科学基金(31760534), fundOrder=null, country=null), Fund(id=1242902980945625910, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, awardId=20202BAB213022, language=EN, fundingSource=Natural Science Foundation of Jiangxi Province(20202BAB213022), fundOrder=null, country=null), Fund(id=1242902981067260735, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, awardId=20202BAB213022, language=CN, fundingSource=江西省自然科学基金(20202BAB213022), fundOrder=null, country=null)], companyList=[AuthorCompany(id=1242902967838425352, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, xref=null, ext=[AuthorCompanyExt(id=1242902967846813961, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, companyId=1242902967838425352, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co-construction by Ministry and Province), College of Agriculture, Yangtze University, Jingzhou 434025, Hubei, China), AuthorCompanyExt(id=1242902967851008266, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, companyId=1242902967838425352, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=1 长江大学 农学院, 农业农村部长江中游作物绿色高效生产重点实验室(部省共建), 湖北 荆州 434025)]), AuthorCompany(id=1242902967972643092, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, xref=null, ext=[AuthorCompanyExt(id=1242902967976837397, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, companyId=1242902967972643092, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 School of Pharmacy and Life Sciences, Jiujiang University, Jiujiang 332005, Jiangxi, China), AuthorCompanyExt(id=1242902967993614614, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, companyId=1242902967972643092, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=2 九江学院 药学与生命科学学院, 江西 九江 332005)])], figs=[ArticleFig(id=1242902974738055804, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Figure 1, caption=Schematic diagram depicting the construction (A) and PCR confirmation (B) of a markerless deletion mutant of the coding region of cbrB. M: DNA marker; 1: Pf-5; 2: Pf5274., figureFileSmall=Q359jPO7HYKcR3OPc+6/Qg==, figureFileBig=MJ9s9+Q2vLXgzpE84Ak5+A==, tableContent=null), ArticleFig(id=1242902976373834370, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=图1, caption=cbrB编码区无痕缺失突变菌株的构建流程(A)及PCR验证(B), figureFileSmall=Q359jPO7HYKcR3OPc+6/Qg==, figureFileBig=MJ9s9+Q2vLXgzpE84Ak5+A==, tableContent=null), ArticleFig(id=1242902976629686926, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Figure 2, caption=Effects of cbrB knockout or overexpression on the growth of strain Pf-5. Growth status of Pf-5 and its derivatives in LB broth (A, B) and M9-glucose broth (C, D)., figureFileSmall=ECpYDM+sIZ6L6lI3wTA0Ig==, figureFileBig=OPKg4X3nipWsQZeUVf57nw==, tableContent=null), ArticleFig(id=1242902976776487575, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=图2, caption=cbrB敲除或过表达对菌株Pf-5生长的影响

Pf-5及其衍生菌在LB培养基(A、B)和M9-葡萄糖培养基(C、D)中的生长情况

, figureFileSmall=ECpYDM+sIZ6L6lI3wTA0Ig==, figureFileBig=OPKg4X3nipWsQZeUVf57nw==, tableContent=null), ArticleFig(id=1242902976902316704, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Figure 3, caption=Effects of cbrB knockout or overexpression on the biofilm formation of strain Pf-5. A: The crystal violet staining results on the biofilm formation of Pf-5 and its derivative strains. B: The OD595 value on the biofilm formation of Pf-5 and its derivative strains after crystal violet staining. ***: P≤0.001; #: 0.01 < P≤0.05; ##: 0.001 < P≤0.01., figureFileSmall=TXWAHcfVWXapHykLaanCFA==, figureFileBig=3jj4OYzKK1/DshFc199jbA==, tableContent=null), ArticleFig(id=1242902977070088868, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=图3, caption=cbrB敲除或过表达对菌株Pf-5生物膜形成的影响

A:Pf-5及其衍生菌生物膜的结晶紫染色结果. B:Pf-5及其衍生菌生物膜结晶紫染色后的OD595

, figureFileSmall=TXWAHcfVWXapHykLaanCFA==, figureFileBig=3jj4OYzKK1/DshFc199jbA==, tableContent=null), ArticleFig(id=1242902977179140781, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Figure 4, caption=Effects of cbrB knockout or overexpression on the motility of strain Pf-5. A: The motility of Pf-5 and its derivative strains in semisolid media. B: The diameter of the motility halo of Pf-5 and its derivative strains in semisolid media. **: 0.001 < P≤0.01; #: 0.01 < P≤0.05; ##: 0.001 < P≤0.01., figureFileSmall=BjpO5yNIamnaaVzuz4nB8w==, figureFileBig=4BtNLxnz3AhLBAbvSeZ9wA==, tableContent=null), ArticleFig(id=1242902977283998388, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=图4, caption=cbrB敲除或过表达对菌株Pf-5运动性的影响

A:Pf-5及其衍生菌在半固体培养基中的运动情况. B:Pf-5及其衍生菌在半固体培养基中的运动晕直径

, figureFileSmall=BjpO5yNIamnaaVzuz4nB8w==, figureFileBig=4BtNLxnz3AhLBAbvSeZ9wA==, tableContent=null), ArticleFig(id=1242902977732788925, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Figure 5, caption=Effects of cbrB knockout or overexpression on the antifungal activity of strain Pf-5. A: Plate confrontation results of Pf-5 and its derivative strains with Pythium ultimum ACCC 37386. B: The width of the inhibition zone between Pf-5 and its derivative strains with Pythium ultimum ACCC 37386 after plate confrontation. **: 0.001 < P≤0.01; #: 0.01 < P≤0.05; ##: 0.001 < P≤0.01., figureFileSmall=DQvhTSjhfbJdRjhJ6G5yUA==, figureFileBig=qGUhbPbv4ZNGy7KuRIKk7g==, tableContent=null), ArticleFig(id=1242902977997030092, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=图5, caption=cbrB敲除或过表达对菌株Pf-5抗真菌活性的影响

A:Pf-5及其衍生菌与终极腐霉ACCC 37386的平板对峙结果. B:Pf-5及其衍生菌与终极腐霉ACCC 37386平板对峙的抑菌带宽度

, figureFileSmall=DQvhTSjhfbJdRjhJ6G5yUA==, figureFileBig=qGUhbPbv4ZNGy7KuRIKk7g==, tableContent=null), ArticleFig(id=1242902978139636439, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Figure 6, caption=Effects of cbrB knockout (A) or overexpression (B) on the expression of Plt synthesis operon pltL-G. *: 0.01 < P≤0.05; **: 0.001 < P≤0.01; ##: 0.001 < P≤0.01., figureFileSmall=1pSbjmCeIfbu/r15hOWKig==, figureFileBig=yzjeYXmIV3W7PRmJ33+3qA==, tableContent=null), ArticleFig(id=1242902978441626338, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=图6, caption=cbrB敲除(A)或过表达(B)对Plt合成操纵子pltL-G表达的影响, figureFileSmall=1pSbjmCeIfbu/r15hOWKig==, figureFileBig=yzjeYXmIV3W7PRmJ33+3qA==, tableContent=null), ArticleFig(id=1242902978554872556, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Table 1, caption=

Strains and plasmids used in this study

, figureFileSmall=null, figureFileBig=null, tableContent=
Strains and plasmidsRelevant characteristicsSources
Escherichia coli
  Top10mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15ΔlacX74 recA1 araD139Δ(ara-leu) 7697galU galK rpsL (StrR) endA1 nupG, used for cloningInvitrogen
  ET12567(pUZ8002)dam-13T: : Tn9 dcm-6 hsdM cmlR, kanR, used for biparental mating[31]
Pseudomonas protegens
  Pf-5Rhizosphere isolate, Ampr[32]
  Pf5274ΔcbrB derivative of Pf-5, AmprThis study
  Pf-5 pBBR1AmPf-5 harboring pBBR1Am plasmid, Ampr and AmrThis study
  Pf5274 pBBR1AmPf5274 harboring pBBR1Am plasmid, Ampr and AmrThis study
  Pf-5 pAm-cbrBPf-5 harboring pAm-cbrB plasmid, Ampr and AmrThis study
  Pf5274 pAm-cbrBPf5274 harboring pAm-cbrB plasmid, Ampr and AmrThis study
Pythium ultimum
  ACCC 37386Soil isolateAgricultural culture collection of China
Plasmids
  pJQ200SKSuicide vector with sacB counter-selectable marker used for homologous recombination, Gmr[33]
  PJQΔcbrBpJQ200SK carrying a 2 067 bp Xba Ⅰ/Spe Ⅰ insert with a deletion in the coding region of cbrB; GmrThis study
  pBBR1MCS-5Broad-host-range vector; Gmr[34]
  pBBR001pBBR1MCS-5 with a translational 'lacZ fusion, Gmr[35]
  pBBR-pltL'-'lacZpBBR001 with a translational pltL'-'lacZ fusion; GmrThis study
  pBBR1AmNco Ⅰ/Bgl Ⅱ-digested apramycin resistance cassette subcloned in pBBR1MCS-5 digested with the same endonucleases, AmrThis study
  pAm-cbrBpBBR1Am carrying a 1 504 bp Xba Ⅰ/Hind Ⅲ insert with the coding region of cbrB, AmrThis study
), ArticleFig(id=1242902978693284602, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=表1, caption=

本研究所用菌株和质粒

, figureFileSmall=null, figureFileBig=null, tableContent=
Strains and plasmidsRelevant characteristicsSources
Escherichia coli
  Top10mcrA Δ(mrr-hsdRMS-mcrBC) Φ80lacZΔM15ΔlacX74 recA1 araD139Δ(ara-leu) 7697galU galK rpsL (StrR) endA1 nupG, used for cloningInvitrogen
  ET12567(pUZ8002)dam-13T: : Tn9 dcm-6 hsdM cmlR, kanR, used for biparental mating[31]
Pseudomonas protegens
  Pf-5Rhizosphere isolate, Ampr[32]
  Pf5274ΔcbrB derivative of Pf-5, AmprThis study
  Pf-5 pBBR1AmPf-5 harboring pBBR1Am plasmid, Ampr and AmrThis study
  Pf5274 pBBR1AmPf5274 harboring pBBR1Am plasmid, Ampr and AmrThis study
  Pf-5 pAm-cbrBPf-5 harboring pAm-cbrB plasmid, Ampr and AmrThis study
  Pf5274 pAm-cbrBPf5274 harboring pAm-cbrB plasmid, Ampr and AmrThis study
Pythium ultimum
  ACCC 37386Soil isolateAgricultural culture collection of China
Plasmids
  pJQ200SKSuicide vector with sacB counter-selectable marker used for homologous recombination, Gmr[33]
  PJQΔcbrBpJQ200SK carrying a 2 067 bp Xba Ⅰ/Spe Ⅰ insert with a deletion in the coding region of cbrB; GmrThis study
  pBBR1MCS-5Broad-host-range vector; Gmr[34]
  pBBR001pBBR1MCS-5 with a translational 'lacZ fusion, Gmr[35]
  pBBR-pltL'-'lacZpBBR001 with a translational pltL'-'lacZ fusion; GmrThis study
  pBBR1AmNco Ⅰ/Bgl Ⅱ-digested apramycin resistance cassette subcloned in pBBR1MCS-5 digested with the same endonucleases, AmrThis study
  pAm-cbrBpBBR1Am carrying a 1 504 bp Xba Ⅰ/Hind Ⅲ insert with the coding region of cbrB, AmrThis study
), ArticleFig(id=1242902978823308032, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=EN, label=Table 2, caption=

Primers used in this study

, figureFileSmall=null, figureFileBig=null, tableContent=
NameSequences (5′→3′)Usage
小写字母为保护碱基和限制性内切酶酶切位点
Lowercase letters represent protecting bases and restriction enzyme cleavage sites.
cbrBU-U-XbacctctagATCTCGCGTATCGTCCAGTUpstream homologous arm of cbrB
cbrBU-L-XhogtactcgaGATTTCGCCATTGTTGTTG
cbrBD-U-XhogtactcGAGCTGGCACGCAAACTDownstream homologous arm of cbrB
cbrBD-L-SpegactagTGGGGGTGATATTGAGCAG
cbrBFTACATCGCCAAGCCGTTCVerification of cbrB deletion
cbrBRTGACCTTTCGATCCAACCAG
cbrBF-Hind ⅢctcaagcttATGCCGCATATTCTGATCoding region of cbrB
cbrBR-XbactctctagaCCTGTTACGTGCGATG
pltL-PF-XbaccttctagaGCCAAGTAGTCTTCCTGTTTCPromoter and partial coding region of pltL
pltLʹ-PR-XhocatctcgaGCCCGATCAAATCTTCCATG
), ArticleFig(id=1242902978957525776, tenantId=1146029695717560320, journalId=1192105938417971205, articleId=1241783830890218175, language=CN, label=表2, caption=

本研究所用引物

, figureFileSmall=null, figureFileBig=null, tableContent=
NameSequences (5′→3′)Usage
小写字母为保护碱基和限制性内切酶酶切位点
Lowercase letters represent protecting bases and restriction enzyme cleavage sites.
cbrBU-U-XbacctctagATCTCGCGTATCGTCCAGTUpstream homologous arm of cbrB
cbrBU-L-XhogtactcgaGATTTCGCCATTGTTGTTG
cbrBD-U-XhogtactcGAGCTGGCACGCAAACTDownstream homologous arm of cbrB
cbrBD-L-SpegactagTGGGGGTGATATTGAGCAG
cbrBFTACATCGCCAAGCCGTTCVerification of cbrB deletion
cbrBRTGACCTTTCGATCCAACCAG
cbrBF-Hind ⅢctcaagcttATGCCGCATATTCTGATCoding region of cbrB
cbrBR-XbactctctagaCCTGTTACGTGCGATG
pltL-PF-XbaccttctagaGCCAAGTAGTCTTCCTGTTTCPromoter and partial coding region of pltL
pltLʹ-PR-XhocatctcgaGCCCGATCAAATCTTCCATG
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CbrB在防御假单胞菌Pf-5生物防治中的作用
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饶光耀 1 , 万成 2 , 石红璆 2 , 董小林 1, * , 查代明 2, *
微生物学报 | 研究报告 2024,64(9): 3506-3520
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微生物学报 | 研究报告 2024, 64(9): 3506-3520
CbrB在防御假单胞菌Pf-5生物防治中的作用
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饶光耀1, 万成2, 石红璆2, 董小林1, * , 查代明2, *
作者信息
  • 1 长江大学 农学院, 农业农村部长江中游作物绿色高效生产重点实验室(部省共建), 湖北 荆州 434025
  • 2 九江学院 药学与生命科学学院, 江西 九江 332005
Role of CbrB in the biocontrol strain Pseudomonas protegens Pf-5
Guangyao RAO1, Cheng WAN2, Hongqiu SHI2, Xiaolin DONG1, * , Daiming ZHA2, *
Affiliations
  • 1 MARA Key Laboratory of Sustainable Crop Production in the Middle Reaches of the Yangtze River (Co-construction by Ministry and Province), College of Agriculture, Yangtze University, Jingzhou 434025, Hubei, China
  • 2 School of Pharmacy and Life Sciences, Jiujiang University, Jiujiang 332005, Jiangxi, China
出版时间: 2024-06-05 doi: 10.13343/j.cnki.wsxb.20240168
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【目的】从基因水平探究碳分解代谢阻遏调控系统中CbrB对防御假单胞菌(Pseudomonas protegens) Pf-5生物防治能力的影响。【方法】通过基于pJQ200SK的二次同源重组法构建cbrB编码区无痕缺失突变菌株Pf5274,采用基于pBBR1Am的质粒回补法构建cbrB互补菌株及其对照菌株,通过测定菌株OD600、结晶紫染色法、琼脂平板法、平板对峙法和pltL'-'lacZ融合报告菌株,分析CbrB对防御假单胞菌Pf-5生长、生物膜形成、运动性、抗真菌活性和藤黄绿脓菌素合成的影响。【结果】CbrB在天然培养基LB中显著抑制Pf-5的生长,而在基础培养基M9-葡萄糖中则显著促进Pf-5的生长;CbrB显著促进Pf-5的运动性,但是却抑制其生物膜形成、抗真菌活性及藤黄绿脓菌素合成。【结论】CbrB在调控防御假单胞菌Pf-5生物防治方面具有一定的作用,具体表现在菌株生长、生物膜形成、运动性、抗真菌活性及藤黄绿脓菌素合成等方面。本研究为利用基因工程技术提高生防菌株生物防治能力提供理论依据,并为深度发掘藤黄绿脓菌素生物合成奠定基础。

防御假单胞菌  /  CbrB  /  生物防治  /  藤黄绿脓菌素  /  运动性  /  生物膜形成

[Objective] To explore the effects of CbrB from the carbon catabolite repression system on the biocontrol performance of Pseudomonas protegens Pf-5. [Methods] The mutant Pf5274 with the markerless deletion of the coding region of cbrB was constructed by a double-crossover recombination event based on pJQ200SK. Moreover, the complementary strain of cbrB and the control strains were constructed by the plasmid complementation method based on pBBR1Am. Lastly, the effects of CbrB on the growth, biofilm formation, motility, antifungal activity, and pyoluteorin synthesis of Pf-5 were analyzed by the measurement of OD600, crystal violet staining, agar plate culture, plate confrontation method, and pltL'-'lacZ fusion report strains, respectively. [Results] CbrB greatly slowed the growth of Pf-5 in the natural medium LB, but greatly sped up the growth of Pf-5 in the basic medium M9-glucose. In addition, CbrB significantly promoted the motility but inhibited the biofilm formation, antifungal activity, and pyoluteorin synthesis of Pf-5. [Conclusion] CbrB plays a role in regulating the growth, biofilm formation, motility, antifungal activity, and pyoluteorin synthesis of P. protegens Pf-5, thus regulating the biocontrol performance of this strain. This study provides a theoretical basis for the biocontrol capabilities of strains by genetic engineering and lays a foundation for probing into the biosynthesis of pyoluteorin.

Pseudomonas protegens  /  CbrB  /  biocontrol  /  pyoluteorin  /  motility  /  biofilm formation
饶光耀, 万成, 石红璆, 董小林, 查代明. CbrB在防御假单胞菌Pf-5生物防治中的作用. 微生物学报, 2024 , 64 (9) : 3506 -3520 . DOI: 10.13343/j.cnki.wsxb.20240168
Guangyao RAO, Cheng WAN, Hongqiu SHI, Xiaolin DONG, Daiming ZHA. Role of CbrB in the biocontrol strain Pseudomonas protegens Pf-5[J]. Acta Microbiologica Sinica, 2024 , 64 (9) : 3506 -3520 . DOI: 10.13343/j.cnki.wsxb.20240168
绿水青山就是金山银山,生态文明建设离不开农业的可持续发展[1]。可持续发展理念的提倡以及公众对化学农药对人类健康造成潜在危害的关注,激发了人们对植物病虫害生物防治研究的兴趣,迫切希望寻找更环保、更健康的病虫害防治策略。目前研究热点之一的植物根际促生细菌(plant growth promoting rhizobacteria, PGPR)通过产生促生物质促进植物生长,同时分泌生物活性物质和竞争病原菌生态位抑制土壤中的植物病原菌,其生物防治的主要能力在于通过分泌抗生素、运动和定殖竞争生态位等实现[2-4]。本研究聚焦的模式生物防御假单胞菌(Pseudomonas protegens) Pf-5以抑制植物病害和广谱的生防活性而著称,它能够分泌一系列具有生防活性的次级代谢产物,如藤黄绿脓菌素、2, 4-二乙酰基间苯三酚、硝吡咯菌素、氰化氢、铁载体、脂肽A等[5-7]。这些生防活性物质能有效抵抗多种农作物土传病原菌,如大麻霉斑病、玉米褐斑病、棉花和甜菜立枯病、番茄根腐病等病原菌[8-9],在生物防治和生防菌剂的开发及应用方面具有巨大潜力。
藤黄绿脓菌素(pyoluteorin, Plt)作为一种芳香族聚酮类抗生素,其对多种真菌尤其卵菌属真菌具有显著抑制作用[9-11]。此外Plt还具有抗肿瘤活性,可在体外诱导人三阴性乳腺癌细胞MDA-MB-231发生细胞凋亡[12]。菌株Pf-5中负责Plt合成和转运的基因簇由两对相反转录的操纵子pltRM-pltLABCDEFG[5]和pltZ-pltIJKNOP[13]构成,其中LysR家族的调控蛋白PltR在转录水平上激活合成操纵子pltLABCDEFG[14],TetR家族的调控蛋白PltZ则负调控转运操作子pltIJKNOP[15],Plt生物合成还受全局调控系统GacS/A-RsmXYZ-RsmE、RNA伴侣蛋白Hfq与非典型调控蛋白(Lon、RpoS和RpoN)的调节,除了上述参与假单胞菌抗生素生物合成的调控系统和因子,碳分解代谢阻遏调控系统CbrA/B-CrcY/Z-Crc也可能参与控制假单胞菌抗生素生物合成[16-17]
目前假单胞菌CbrB功能的研究主要集中在碳氮代谢相关的基因表达调控机制。CbrB最早于1985年在菊欧文氏菌(Erwinia chrysanthemi) 3937中被发现,cbr基因簇编码的CbrA是一个蛋白激酶,感受外界信号磷酸化后活化相应的调节子CbrB[18]。2001年在铜绿假单胞菌(P. aeruginosa)中发现CbrA/B双组分系统控制菌体碳氮代谢,cbrAcbrB基因突变体不能使用精氨酸、组氨酸和脯氨酸等氨基酸及胍丁胺作为氮源,也无法使用甘露醇、葡萄糖、丙酮酸和柠檬酸作为碳源[19]。2009年在铜绿假单胞菌中发现了新的sRNA CrcZ,同时揭示了Crc蛋白功能与CbrA/B系统密切相关,碳分解代谢阻遏调控系统赋予细菌灵活适应多种碳源的能力[20]。2011年在铜绿假单胞菌中发现CbrA和CbrB协同调节细菌毒力相关过程,包括生物膜形成、细胞毒性和对抗生素的耐药性[21]。2011年在铜绿假单胞菌中发现RsmY和RsmZ既是GacS/A信号转导通路中的中心调控元件,也是CbrA/B信号转导通路中的关键调节因子[22]。2012年在恶臭假单胞菌(P. putida)中发现CbrA/B双组分系统激活CrcZ转录,CrcY/Z协同作用阻遏翻译抑制因子Crc蛋白[23]。2013年在恶臭假单胞菌中发现响应调节蛋白CbrB是RpoN依赖性启动子的激活剂,它直接控制恶臭假单胞菌中sRNA CrcZ和CrcY的表达,但仍有部分CrcY的产生来自独立于CbrB的上游启动子[24]。2016年利用转座子突变构建了恶臭假单胞菌的cbrB缺失突变体,全基因组测序检测到lapGlapD中的另外2个点突变,这些效应组合产生了生物膜过量表达的表型[25]。2017年在假单胞菌科的固氮杆菌瓦恩兰德固氮菌(Azotobacter vinelandii)中发现葡萄糖转运蛋白GluP的表达受到CbrA/CbrB和Crc/Hfq系统控制[26]。2021年在荧光假单胞菌(P. fluorescens)中发现局部转录因子HutC通过hut启动子处2个双组分系统NtrB/C和CbrA/B间的相互作用维持菌体碳氮稳态[27]。2022年在铜绿假单胞菌中发现CbrA/B系统是常见变异株lasR出现的关键,损伤肺功能的化合物以CbrB控制的形式促进lasR谱系细胞生长[28]。2022年在铜绿假单胞菌中发现双GGDEF/EAL结构域蛋白RmcA与CbrB蛋白相互作用,CbrB参与RmcA对生物膜形成和Ⅲ型分泌系统基因的表达,拓展了对细菌二级信号分子环二鸟苷酸信号传导调控网络的理解[29]。目前,CbrB对防御假单胞菌Pf-5生物防治功能的影响尚不清楚。
本研究从根际促生细菌生物防治功能出发,检测了CbrB对防御假单胞菌Pf-5生长、运动性、生物膜形成、抗真菌活性和抗生素生物合成的影响,研究结果为利用基因工程技术优化生防菌株生物防治能力提供理论依据[30]。此外,野生型Pf-5中藤黄绿脓菌素等生防活性物质的产量通常较低,本研究通过敲除cbrB有效增强了藤黄绿脓菌素的表达,为深度发掘藤黄绿脓菌素生物合成关键基因奠定了基础[17]
本研究所使用的菌株和质粒如表1所示。
PrimeSTAR® HS (Premix)、限制性内切酶和T4 DNA Ligase均购自TaKaRa公司;2×Es Taq MasterMix (Dye)、Gel Extraction Kit和PurePlasmid Mini Kit均购自康为世纪生物科技股份有限公司;氨苄青霉素钠(Amp)、硫酸庆大霉素(Gm)、硫酸阿布拉霉素(Am)、硫酸卡那霉素(Km)、X-Gal、胰蛋白胨、蛋白胨、酵母提取物、琼脂粉等均购自生工生物工程(上海)股份有限公司;其他试剂均为分析纯。
LB培养基(g/L):蛋白胨10.00,酵母提取物5.00,NaCl 10.00;固体培养基另加琼脂粉15.00 g/L。M9-葡萄糖培养基(g/L):Na2HPO4 7.10,KH2PO4 2.72,NaCl 0.58,NH4Cl 1.07,MgSO4 0.19,CaCl2 0.01,葡萄糖20.00。运动性培养基(g/L):胰蛋白胨10.00,NaCl 5.00,琼脂粉3.00/5.00。PDA培养基(g/L):马铃薯100.00,葡萄糖20.00,琼脂粉15.00。38号固体培养基(g/L):酵母提取物4.00,葡萄糖4.00,麦芽浸粉5.00,琼脂粉15.00。必要时培养基中添加的Amp、Gm、Am、Km和X-Gal终浓度分别为100、50、50、30和200 μg/mL。
本研究所使用的引物如表2所示,其合成由武汉天一华煜基因科技有限公司完成,后续质粒测序由北京擎科生物科技股份有限公司武汉分公司完成。
为了探究CbrB对菌株Pf-5生物防治能力的影响,采用基于pJQ200SK的二次同源重组法[35]构建cbrB编码区无痕缺失突变菌株Pf5274,其构建图谱如图1A所示。以野生型菌株Pf-5基因组DNA为模板,利用2对引物cbrBU-U-Xba Ⅰ/cbrBU-L-Xho Ⅰ与cbrBD-U-Xho Ⅰ/cbrBD-L-Spe Ⅰ分别扩增cbrB开放阅读框的上、下游DNA片段,然后将这2个双酶切的DNA片段同时克隆到pJQ200SK的Xba Ⅰ−Spe Ⅰ位点,得到重组质粒pJQΔcbrB。将pJQΔcbrB转化至大肠杆菌ET12567(pUZ8002)中,通过双亲本杂交将pJQΔcbrB从大肠杆菌ET12567(pUZ8002)接合转移至防御假单胞菌Pf-5中;第1次同源重组在包含Amp和Gm的LB固体培养基上进行,用引物cbrBF/cbrBR筛选能同时扩增出2条带的单菌落,因为pJQ200SK不能在假单胞菌中复制,在Gm选择压力下通过第1次同源重组事件将重组质粒整合到基因组上进行复制;第2次同源重组在包含Amp和蔗糖的LB固体培养基上进行,用引物cbrBF/cbrBR筛选仅扩增出小条带的单菌落,因为在蔗糖压力下通过第2次同源重组事件消除基因组中的pJQ200SK序列,从而解除SacB的蔗糖致死效应并达到删除靶序列的目的;最后在包含Gm的LB固体培养基中过夜培养以验证pJQ200SK的消除,无Gm抗性的菌株即为cbrB缺失突变菌株Pf5274。
为了对cbrB缺失突变菌株进行互补实验,使用引物cbrBF-Hind Ⅲ/cbrBR-Xba Ⅰ扩增包含完整cbrB开放阅读框的DNA片段,纯化后的DNA片段用Hind Ⅲ和Xba Ⅰ进行双酶切,然后克隆到pBBR1Am的Hind Ⅲ−Xba Ⅰ位点得到cbrB过表达质粒pAm-cbrB,将其转化至大肠杆菌ET12567(pUZ8002)中,通过双亲本杂交将pAm-cbrB分别转移至Pf-5和Pf5274中得到重组菌株Pf-5 pAm-cbrB和Pf5274 pAm-cbrB,通过同样的方法同时得到对照菌株Pf-5 pBBR1Am和Pf5274 pBBR1Am。
为了检测CbrB对藤黄绿脓菌素生物合成基因簇pltL-G表达的影响,使用引物pltL-PF-Xba Ⅰ/pltL'-PR-Xho Ⅰ扩增包含pltL启动子和部分开放阅读框的DNA片段,将双酶切的DNA片段克隆到pBBR001的Xba Ⅰ−Xho Ⅰ位点得到pBBR-pltL'-'lacZ,然后将其转化至大肠杆菌ET12567(pUZ8002)中,通过双亲本杂交将pBBR-pltL'-'lacZ转入到Pf-5及其衍生菌。
将Pf-5及其衍生菌株划线培养2 d,挑取单菌落分别接种到添加了Amp或Am的10 mL LB培养基中,28 ℃、120 r/min振荡培养至菌液OD600为1.0左右;取2 mL菌液,5 000 r/min离心5 min收集菌体。用新鲜的LB液体培养基洗2次并重新悬浮,随后调节种子液的浓度为OD600为1.0;将种子液按1:1 000的比例转接到装有100 mL新鲜LB培养基或M9-葡萄糖培养基的500 mL锥形瓶中,28 ℃、120 r/min振荡培养;接种6 h时取1 mL菌液离心后重悬在等体积去离子水中,以去离子水作空白对照,检测OD600值,随后每隔12 h取样,绘制生长曲线;培养基中根据需要添加适量抗生素。
生物膜形成的检测参照Gu等[9]的方法并作适当修改,使用结晶紫染色法评估玻璃试管中菌株生物膜的形成能力。Pf-5及其衍生菌株培养参考1.5节,取10 µL调节后的种子液接种到含有10 mL LB培养基的试管中,28 ℃静置培养2 d,轻柔地倒出培养基并用0.9%的生理盐水清洗3次去除非贴壁细胞;附着在管壁上的生物膜自然晾干,用11 mL 1%结晶紫溶液室温染色20 min;再用0.9%的生理盐水清洗3遍,洗去未被生物膜结合的多余结晶紫;试管自然晾干后加入5 mL无水乙醇溶解与生物膜结合的结晶紫;测量溶液在结晶紫吸收峰595 nm处的吸光值并采集试管图像。
运动性的检测参照Liu等[36]的方法并作适当修改,使用琼脂平板法检测菌株的运动性。Pf-5及其衍生菌株培养参考1.5节,取2 µL调节后的种子液垂直接种于不同琼脂浓度(0.3%、0.5%)的运动性培养基中央内部,28 ℃条件下培养2 d,测量迁移区直径并采集平板图像。
植物病原菌选用终极腐霉ACCC 37386,使用平板对峙法评估CbrB对菌株Pf-5抗真菌活性的影响,参照李哲等[37]的方法并作适当修改。将终极腐霉接种在PDA培养基上,28 ℃培养2 d得到活化菌体,使用打孔器切取直径5 mm的终极腐霉菌饼接种到含有38号固体培养基的培养皿中培养24 h,然后将1 µL调节后的种子液接种于距菌饼5 cm处,28 ℃静置培养48 h,测量抑菌带宽度并采集平板图像。
为了检测CbrB是否影响pltL-G的表达,各pltL'-'lacZ融合报告菌株所表达的β-半乳糖苷酶的活力采用Miller法[38]进行测定。将各报告菌株按1:1 000的比例分别接种至装有50 mL新鲜LB液体培养基的250 mL锥形瓶中,在28 ℃、120 r/min条件下培养,每隔4 h取样500 µL检测细胞密度、取样500 µL反应5 min检测β-半乳糖苷酶活力,绘制Pf-5和cbrB缺失突变菌株的酶活力曲线,测定互补菌株对数期及稳定期的酶活力,辅助验证CbrB的影响。根据公式(1)使用Miller U计算β-半乳糖苷酶活力。
本研究中的每个实验分别进行了3次以上,使用IBM SPSS Statistics 26统计软件分析数据、Origin 2022软件进行图表制作;在每个实验中,至少包含了3次重复的平行样本,所有数据采用平均值±标准差(mean±SD)表示;数据采用Student’s t-test法比较不同处理间的差异显著性。
为了研究CbrB的功能,采用基于pJQ200SK的二次同源重组法构建了cbrB编码区无痕缺失突变菌株Pf5274,其构建流程如图1A所示。利用引物cbrBF/cbrBR进行cbrB缺失突变菌株的PCR鉴定,以Pf-5基因组为对照,缺失突变菌株Pf5274可扩增出658 bp条带,Pf-5可扩增出1 543 bp条带,与图1B所示结果相符,表示缺失突变菌株构建成功。
通过检测菌液的OD600值反映CbrB对菌株Pf-5生长的影响,Pf-5及其衍生菌株的生长曲线如图2所示。
在LB培养基中,cbrB缺失突变菌株Pf5274的OD600值最高为3.090,较野生型菌株Pf-5显著性上升了12.7% (图2A)。从互补实验结果可知,在Pf-5和Pf5274中过表达cbrB会导致菌株的OD600值分别显著性降低13.2%和9.2%,Pf-5和Pf5274中包含空载质粒pBBR1Am不会干扰CbrB对菌株生长的影响,Pf5274较Pf-5的OD600值显著性上升了12.9% (图2B)。这些结果表明,CbrB在天然培养基LB条件下显著性负调控菌株Pf-5的生长。
在M9-葡萄糖培养基中,Pf5274的OD600最高值为1.514,较Pf-5显著性下降了33.1% (图2C)。从互补实验结果可知,在Pf-5中过表达cbrB会导致菌株OD600值显著性上升11.7%,而在Pf5274中过表达cbrB仅能部分恢复生长,较Pf-5 pBBR1Am的OD600值仍下降了20.8%,Pf-5和Pf5274中包含空载质粒pBBR1Am不会干扰CbrB对菌株生长的影响,Pf5274较Pf-5的OD600值显著性下降了29.2% (图2D)。这些结果表明,CbrB在基础培养基M9-葡萄糖条件下显著性正调菌株Pf-5的生长。
此外,CbrB在对数生长期和稳定期对菌株Pf-5生长的调控趋势相同,而且各菌株的生长曲线不相交,表明CbrB对Pf-5生长的调控在整个细胞周期上具有连续性。
细菌定殖植物的过程中,生物膜形成起着决定性作用,是许多细菌毒力的决定因素[39],生物膜形成的检测结果如图3所示。cbrB缺失突变菌株Pf5274的OD595值为0.674,较野生型菌株Pf-5上升了41.0%,而且生物膜结构厚度也有所增加;尽管Pf5274的生物膜形成量较Pf-5提升了41.0%,但其OD600的增长率仅为12.7%,这表明生物膜形成量的增加不是由于生长速度加快导致的。从互补实验结果可知,在Pf-5和Pf5274中过表达cbrB会导致菌株的生物膜形成量分别显著性下降23.9%和17.7%,Pf-5和Pf5274中包含空载质粒pBBR1Am不会干扰CbrB对菌株生物膜形成的影响,Pf5274较Pf-5的生物膜形成量上升了17.6%。这些结果表明,CbrB显著抑制菌株Pf-5的生物膜形成。
很多细菌都具有运动性,这一特性在生态学和病理学具有重要的意义,影响着生物防治菌株的防治能力,细菌的运动性主要包括浮泳运动(swim motility)和群集运动(swarm motility)两种方式[40]。运动性检测结果如图4所示,无论是浮泳运动还是群集运动,cbrB缺失后菌株的运动能力急剧降低(Pf5274 vs. Pf-5),而过表达cbrB则显著提高菌株的运动能力(Pf-5/Pf5274 pAm-cbrB vs. Pf-5/Pf5274 pBBR1Am),Pf-5和Pf5274中包含空载质粒pBBR1Am不会干扰CbrB对菌株运动性的影响,Pf5274较Pf-5的运动能力显著性降低。以上结果表明,CbrB显著促进菌株Pf-5的运动性。
Pf-5及其衍生菌株对终极腐霉的抑制效果显著,平板对峙培养结果如图5所示。cbrB缺失菌株Pf5274的抑菌带宽度为18 mm,较野生型菌株Pf-5显著性增加了18.7%,而过表达cbrB则导致菌株的抑菌带宽度显著性缩小26.7% (Pf-5 pAm-cbrB vs. Pf-5 pBBR1Am)或18.3% (Pf5274 pAm-cbrB vs. Pf5274 pBBR1Am),Pf-5和Pf5274中包含空载质粒pBBR1Am不会干扰CbrB对菌株生防活性的影响,Pf5274较Pf-5的抑菌带宽度显著性增加了10.8%。以上结果表明,CbrB显著抑制菌株Pf-5的抗真菌活性。
通过检测pltL'-'lacZ融合报告菌株的β-半乳糖苷酶活力,可以反映CbrB对Plt合成操纵子pltL-G表达的影响。如图6所示,cbrB缺失突变菌株Pf5274的β-半乳糖苷酶活力显著高于野生型菌株Pf-5,而过表达cbrB则显著降低报告菌株的β-半乳糖苷酶活力(Pf-5/Pf5274 pAm-cbrB vs. Pf-5/Pf5274 pBBR1Am),Pf-5和Pf5274中包含空载质粒pBBR1Am不会干扰CbrB对报告菌株β-半乳糖苷酶活力的影响,Pf5274较Pf-5的β-半乳糖苷酶活力显著提高。以上结果表明,CbrB通过直接或间接途径显著抑制Plt合成操纵子pltL-G的表达。
作为碳分解代谢阻遏调控系统CbrA/B- CrcY/Z-Crc中的关键调控因子,CbrB在假单胞菌属的不同菌株中发挥着多种生物学功能,主要涉及碳氮代谢的调控、生物膜形成、运动性以及对环境适应性的基因表达调控。在铜绿假单胞菌中,CbrB显著影响着菌体的碳氮代谢,cbrB缺失突变体表现出对多种氨基酸和糖类的利用障碍[19];此外,CbrB还参与调控细菌的毒力相关过程,如生物膜形成、细胞毒性和对抗生素的耐药性,cbrB的缺失会增强细菌毒性并提高对抗生素的耐药性[21]。在恶臭假单胞菌中,CbrB作为RpoN依赖型启动子的激活剂,直接调控sRNA CrcY和CrcZ的转录,并抑制生物膜形成[25]。在瓦恩兰德固氮菌中,CbrB通过调节葡萄糖转运蛋白GluP的表达影响菌体的碳源利用和能量代谢[26]。在荧光假单胞菌中,CbrB与局部转录因子HutC相互作用,通过与hut启动子处的双组分系统NtrB/C相互作用,共同维持菌体碳氮代谢的稳态[27]
碳分解代谢阻遏调控级联系统能保证细菌处于混合碳源时优先利用速效碳源中的单碳化合物[41]。我们的结果表明,在天然培养基LB条件下CbrB显著负调控菌株Pf-5的生长,而在基础培养基M9-葡萄糖条件下CbrB对菌株Pf-5的生长具有显著正调控作用,这一发现与同属假单胞菌科的固氮杆菌瓦恩兰德固氮菌的报道相一致,当葡萄糖是唯一碳源时,Crc蛋白的过表达会抑制细胞生长[26]。研究报道,在碳分解代谢阻遏调控级联系统中CbrA/B双组分系统会激活CrcY/Z sRNAs的表达,这反过来隔离翻译抑制因子Crc蛋白并消除其对靶标mRNA的抑制[17]。本研究结果和以上报道联系起来,暗示了CbrB是通过碳分解代谢阻遏调控级联系统抑制Crc蛋白,从而解除Crc蛋白对生长的抑制,进而正调控防御假单胞菌生长。
生防菌株在固体表面形成坚固的生物膜使其便于定殖在植物根际,在定殖早期菌株的运动性也发挥着重要作用,众所周知定殖能力强的生防菌株往往运动性并不突出。本研究结果表明,CbrB负调控菌株Pf-5生物膜形成的同时正调控其运动性,这与恶臭假单胞菌的报道相一致[25, 42]。杨国环等[43]认为假单胞菌属细菌在藤黄绿脓菌素生物合成与转运基因簇上有包括防御假单胞菌(Pf-5、CHA0和H78)和铜绿假单胞菌(M18和LESB58)在内的两种不同进化起源,它们虽然在合成及转运基因簇上具有共同的基因组成和布局,然而其在核苷酸序列上以及合成与转运基因簇之间包含多个顺式作用元件的非编码区上有很大差异。本研究结果和以上报道联系起来,提示了CbrB在防御假单胞菌和恶臭假单胞菌中生物膜形成和运动性的调控模式具有相似性,暗示这2种假单胞菌在进化方向上的高同源性。
Howell等[44]发现菌株Pf-5的主要次级代谢产物藤黄绿脓菌素在抑制终极腐霉等植物病原菌中起着较大作用。本研究结果表明,CbrB负调控菌株Pf-5的拮抗终极腐霉活性。Gu等[9]通过HPLC分析鉴定出菌株Pf-5抑制玉米叶褐腐病的菠萝泛菌(Pantoea ananatis) DZ-12的主要抑菌成分为藤黄绿脓菌素、2, 4-二乙酰基间三苯酚(2, 4-diacetylphloroglucinol, 2, 4-DAPG)和脂肽A这3种主要成分,其中藤黄绿脓菌素表现出最强烈的抗生素特性,可有效抑制DZ-12生长。通过pltL′-′lacZ融合报告菌株,发现CbrB负调控Plt的表达,进一步证明CbrB是通过抑制Plt的合成从而降低拮抗终极腐霉的活性。
综上所述,本研究首次揭示了CbrB在防御假单胞菌Pf-5中调控生物膜形成、运动性、抗真菌活性和藤黄绿脓菌素合成方面的作用,并提供了CbrB通过碳代谢调控细菌生长的新见解。这为利用基因工程技术提高生防菌株生物防治能力提供理论依据,并为深度发掘藤黄绿脓菌素生物合成奠定基础。
  • 国家自然科学基金(31760534)
  • 江西省自然科学基金(20202BAB213022)
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2024年第64卷第9期
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doi: 10.13343/j.cnki.wsxb.20240168
  • 接收时间:2024-03-19
  • 首发时间:2026-03-20
  • 出版时间:2024-06-05
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  • 收稿日期:2024-03-19
  • 录用日期:2024-06-03
基金
National Natural Science Foundation of China(31760534)
国家自然科学基金(31760534)
Natural Science Foundation of Jiangxi Province(20202BAB213022)
江西省自然科学基金(20202BAB213022)
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    1 长江大学 农学院, 农业农村部长江中游作物绿色高效生产重点实验室(部省共建), 湖北 荆州 434025
    2 九江学院 药学与生命科学学院, 江西 九江 332005

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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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