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UV-B预处理诱导拟南芥耐旱性的提高
林莉梅, 吕桂珍, 李韶山
华南师范大学生命科学学院, 广州 510631
摘要:  为了解UV-B提高拟南芥(Arabidopsis thaliana)耐旱性的生理机制,将2周龄的野生型拟南芥(WT)和sto突变体幼苗用不同剂量UV-B预处理1周,再用30% PEG模拟干旱处理24 h,对植株的表型进行统计,并测定类黄酮、脯氨酸和MDA含量。结果表明,低剂量UV-B预处理能够提高拟南芥的耐旱性,植株的类黄酮与脯氨酸含量分别提高了20%~40%和50%~65%,细胞膜受损程度降低,从而提高了保水性。低剂量UV-B提高拟南芥耐旱性的效应在sto突变体中消失,证明这种效应在分子机制上可能与STO蛋白相关。
关键词:  拟南芥  PEG  UV-B辐射  sto突变体  交叉抗性
DOI:10.11926/jtsb.4104
分类号:
基金项目:国家自然科学基金项目(31670266);广东省自然科学基金项目(2017A030313115)资助
UV-B-induced Drought Tolerance Improvement in Arabidopsis thaliana
LIN Li-mei, Lü Gui-zhen, LI Shao-shan
School of Life Sciences, South China Normal University, Guangzhou 510631, China
Abstract:  In order to understand the physiological mechanism of UV-B to improve drought resistance of Arabidopsis thaliana, the wild type (Columbia-0, WT) and sto mutant seedlings at 2-week-old were treated with UV-B for one week, and then the seedlings were treated with 30%PEG for 24 hours, the phenotypes of the plants were counted, and the contents of flavonoids, proline and MDA were determined. The results showed that low doses of UV-B pretreatment could enhance drought resistance of A. thaliana, the contents of proline and flavonoids increased for 20%-40% and 50%-65%, respectively, and the cell membrane damage reduced, the water retention was improved. The effect of low dose UV-B in enhancing A. thaliana drought tolerance disappeared in sto mutants, indicating the effect might be related to STO protein in the molecular mechanism.
Key words:  Arabidopsis thaliana  PEG  UV-B radiation  sto mutant  Cross-tolerance

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