Article(id=1236286114101785311, tenantId=1146029695717560320, journalId=1235980609244409860, issueId=1236286111962690215, articleNumber=null, orderNo=null, doi=10.3969/j.issn.1000-2561.2023.01.011, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1643040000000, receivedDateStr=2022-01-25, revisedDate=1652198400000, revisedDateStr=2022-05-11, acceptedDate=null, acceptedDateStr=null, onlineDate=1772683178686, onlineDateStr=2026-03-05, pubDate=1674576000000, pubDateStr=2023-01-25, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1772683178686, onlineIssueDateStr=2026-03-05, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1772683178686, creator=13701087609, updateTime=1772683178686, updator=13701087609, issue=Issue{id=1236286111962690215, tenantId=1146029695717560320, journalId=1235980609244409860, year='2023', volume='44', issue='1', pageStart='1', pageEnd='223', issueExtLink='null', onlineDate='null', pubDate='null', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1772683178177, creator=13701087609, updateTime=1772683343075, updator=13701087609, preIssue=null, nextIssue=null, ext={EN=IssueExt(id=1236286803662139491, tenantId=1146029695717560320, journalId=1235980609244409860, issueId=1236286111962690215, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1236286803662139492, tenantId=1146029695717560320, journalId=1235980609244409860, issueId=1236286111962690215, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null}, startPage=103, endPage=112, ext={EN=ArticleExt(id=1236286114517021426, articleId=1236286114101785311, tenantId=1146029695717560320, journalId=1235980609244409860, language=EN, title=Effects of Exogenous EBR on Antioxidant System and Fatty Acid Unsaturation of Pitaya Seedling under Low Temperature Stress, columnId=1236286112986100399, journalTitle=Chinese Journal of Tropical Crops, columnName=Plant Cultivetion, Physiology & Biochemistry, runingTitle=null, highlight=null, articleAbstract=

Low temperature is an important factor limiting the growth, development and yield of pitaya. 2,4-Epibrassinolide (EBR) can enhance the resistance of plants to various stresses such as low temperature. In order to improve the cold resistance of pitaya and alleviate the damage caused by low temperature, the cutting seedlings of red pulp pitaya 'Taiwan No. 6' was sprayed with 0.5 mg/L EBR, and treated under low temperature stress (4℃/0℃, 12 h/12 h) for 7 days. Reactive oxygen species (ROS) content, antioxidant enzyme activity, relative conductivity (REC), malondialdehyde (MDA) content, fatty acid composition and content were determined to clarify the regulatory effect of EBR on the cold tolerance of pitaya seedlings. Furthermore, the relationship between antioxidant system and fatty acid unsaturation of membrane lipids under low temperature stress was studied. Low temperature stress (4℃/0℃, 12 h/12 h) increased the content of reactive oxygen species (ROS), significantly decreased the content of unsaturated fatty acids. The fatty acids unsaturation (UFA/SFA) and double bond index (DBI) reduced by 32.1% and 32.4% respectively, and significantly increased the content of malondialdehyde (MDA) and relative conductivity (REC), resulting in decreased membrane stability and increased membrane permeability. The plants showed obvious watery stains and slight wilting, and the index of chilling injury reached 0.60. Under low temperature, exogenous EBR treatment increased the activities of superoxide dismutase, peroxidase and catalase, effectively removed the excessive accumulated ROS, significantly reduced the production rate of superoxide anion and the content of hydrogen peroxide, alleviated the oxidation reaction between ROS and unsaturated fatty acids in membrane lipids, and increased the relative content of unsaturated fatty acids in pitaya seedlings. The proportion of saturated fatty acids decreased significantly, UFA/SFA and DBI increased significantly, EBR maintained the stability of cell membrane, reduced REC and the content of membrane lipid peroxidation products MDA, greatly reduced watery stains of plants, and the index of chilling injury was reduced to 0.25. It is becouse EBR can activate the antioxidant enzyme system and effectively remove a large number of accumulated ROS under stress, leading to reduce the double-bond fracture of unsaturated fatty acids in membrane lipids, alleviate the degree of membrane lipid peroxidation, maintain the stability and function of membrane membrane. In conclusion, under low temperature stress, exogenous EBR can effectively improve the cold tolerance of pitaya seedlings. Its mechanism is by increasing the activity of antioxidant enzymes in pitaya seedlings, remove excess accumulated ROS, and significantly increase the unsaturation of cell membrane fatty acids, so as to reduce the degree of membrane lipid peroxidation and electrolyte leakage, maintain the stability and function of cell membranes.

, correspAuthors=Xian LUO, authorNote=null, correspAuthorsNote=, copyrightStatement=null, copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, authorCompany=null, fund=null, authors=null, authorsList=Chuqiao WANG, Lan LUO, Xian LUO, Yongxia JIA, Yimei HUANG), CN=ArticleExt(id=1236286115251024665, articleId=1236286114101785311, tenantId=1146029695717560320, journalId=1235980609244409860, language=CN, title=外源EBR对低温胁迫下火龙果苗抗氧化系统及脂肪酸不饱和度的影响, columnId=1236256434313286224, journalTitle=热带作物学报, columnName=作物栽培与生理生化, runingTitle=null, highlight=null, articleAbstract=

低温是限制火龙果生长发育和产量的重要因素。2,4-表油菜素内酯（2,4-epibrassinolide, EBR）能够增强植物对低温等多种逆境的抗性。为提高火龙果的耐寒性，缓解低温对其造成的伤害，以‘台湾6号’红心火龙果扦插苗为材料，外源喷施0.5 mg/L的EBR，在低温胁迫下（4℃/0℃，12 h/12 h）处理7 d，测定火龙果苗活性氧（ROS）含量、抗氧化酶活性、相对电导率（REC）、丙二醛（MDA）含量、脂肪酸组分及含量等，明确EBR对火龙果苗耐寒性的调控作用，进一步研究低温胁迫下抗氧化系统与膜脂脂肪酸不饱和度之间的关系，阐明EBR的作用机理。结果表明：（1）低温胁迫使火龙果苗ROS含量增加，不饱和脂肪酸含量显著下降，脂肪酸不饱和度（UFA/SFA）和双键指数（DBI）分别降低了32.1%和32.4%，导致膜稳定性降低，膜透性增大，MDA含量及REC显著升高，植株出现明显的水渍状斑点与轻微萎焉，寒害指数达0.60。（2）低温下，外源EBR处理提高了火龙果苗超氧化物歧化酶、过氧化物酶、过氧化氢酶活性，有效清除了过量积累的ROS，超氧阴离子产生速率、过氧化氢含量显著降低，从而缓解了ROS与膜脂中不饱和脂肪酸的氧化反应，提高了火龙果苗不饱和脂肪酸相对含量，饱和脂肪酸的比例显著降低，UFA/SFA和DBI均显著增加，维持了细胞膜稳定性，减少了膜脂过氧化产物MDA含量和REC，植株水渍状斑点大量减少，寒害指数降低至0.25。综上，低温胁迫下，外源EBR有效提高了火龙果苗的耐寒性，其作用机理为通过增加火龙果苗抗氧化酶活性，清除过量积累的ROS，显著提高细胞膜脂肪酸不饱和度，从而减轻膜脂过氧化程度和电解质外渗，维持细胞膜稳定性和功能。

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王楚侨（1998—），女，硕士研究生，研究方向：果树逆境生物学。

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王楚侨（1998—），女，硕士研究生，研究方向：果树逆境生物学。

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