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过表达紫花含笑McMYB52基因增强拟南芥耐热性

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本文以紫花含笑花被为材料，克隆得到一个受热胁迫诱导显著上调的R2R3-MYB转录因子Mc-MYB52，全长717 bp，蛋白分子量为27。95 kDa，等电点为8。86。亚细胞定位结果显示其编码蛋白定位在细胞核中。构建35S∷McMYB52过表达载体并利用花序浸染法转化拟南芥，通过潮霉素抗性筛选以及PCR检测得到T3代纯合转基因拟南芥株系，用于研究McMYB52耐热性的功能。结果表明:与野生型相比，转基因拟南芥株系幼苗基础抗热及获得性抗热存活率分别高达78。57％、95。65％，成苗经高温胁迫后能够复绿。叶片解剖结构说明过表达McMYB52促进维管束横截面面积增大，特别是木质部面积占比，高温后叶片增厚从而调节细胞内渗透平衡。生理指标测定表明，转基因植株内游离脯氨酸含量增高、SOD和POD活性增强以清除热胁迫活性氧的积累从而维持细胞膜的完整。实时荧光定量PCR表明，过量表达McMYB52基因显著提高AtHSFA2及其靶基因AtHSFB2a、HSPs及AtAPX2上调表达，推测过表达McMYB52可能促进高温下AtHSFA2转录调控，协同抗氧化途径，利用维管系统疏导来提高拟南芥耐热性。综上说明，McMYB52可能作为正调控因子参与植物的高温响应。
Overexpression of Michelia crassipes McMYB52 gene in Arabidposis thaliana enhances its heat tolerance
A R2R3-MYB transcription factor gene McMYB52 was cloned from Michelia crassipes,which was significantly up-regulated under heat stress.The gene had 717 bp,encoding 239 amino acids with 27.95 kDa and 8.86 pl.Subcellular localization analysis revealed that McMYB52 protein is localized in nucleus.The ex-pression vector 35S∷McMYB52 was constructed and transformed into wild-type(WT)Arabidposis thaliana plants by the floral dip method.T3 transformed plants were confirmed and selected to study the function of McMYB52 on the heat resistance.The results showed that compared to WT plants,the ectopic expression of McMYB52 in transgenic Arabidposis plants exhibited the survival rates of 78.57％and 95.65％in basal and ac-quired heat resistance,respectively.The adult transgenic plants could successfully regreen after the high tem-perature treatment.Leaf anatomy indicated that overexpression of McMYB52 promoted the increase of vascu-lar bundle cross-sectional area,especially the xylem area ratio,and leaf thickening after high temperature regulated the intracellular osmotic balance.The free proline content,SOD and POD activities were enhanced to remove the accumulation of reactive oxygen and maintain the integrity of cell membrane.Quantitative real-time PCR analysis indicated that overexpression of McMYB52 gene significantly increased the up-regulated expres-sion of AtHSFA2 and its target genes AtHSFB2a,AtAPX2 and the heat shock proteins AtHSP70,AtHSP90,AtHSP101.Taken together,these results demonstrated that McMYB52 played an important role in improving heat tolerance,possibly by promoting vascular tissue development,working on the antioxidant pathway and targeting on the regulation of AtHSFA2 to enhance the expression of some stress-associated genes.

Michelia crassipesMcMYB52Arabidopsis thalianaheat stressleaf anatomy

余秋岫、孙佳慧、张画、张哲、刘彩贤、金晓玲

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中南林业科技大学风景园林学院,湖南省自然保护地风景资源大数据工程技术研究中心,岳麓山实验室碳汇林品种创制中心,长沙 410004

紫花含笑 McMYB52 拟南芥 高温 叶片解剖

湖南省自然科学基金面上项目国家自然科学基金青年基金项目湖南省教育厅优秀青年项目湖南省研究生科研创新项目中南林业科技大学研究生创新基金国家林业局重点学科湖南省"双一流"培育学科广西南宁青秀山风景园林国家长期科研基地

2024JJ56273170195420B599CX20220740CX202201026林人发[2016]21号湘教通[2018]469号林科发[2021]96号

2024

10.13592/j.cnki.ppj.100965

植物生理学报
中国植物生理学会，中国科学院上海生命科学研究院植物生理生态研究所

植物生理学报

CSTPCD北大核心
影响因子：1.532
ISSN：2095-1108
年,卷(期)：2024.60(9)