Physiological and Comparative Transcriptome Analysis Reveals the Mechanism by Which Exogenous 24-Epibrassinolide Application Enhances Drought Resistance in Potato (Solanum tuberosum L.)
文献类型： 外文期刊
作者： Zheng, Hao 1 ; Ma, Jie 2 ; Huang, Wenli 1 ; Di, Hongmei 1 ; Xia, Xue 1 ; Ma, Wei 2 ; Ma, Jun 2 ; Yang, Jiao 2 ; Li, Xiaomei 3 ; Lian, Huashan 5 ; Huang, Zhi 1 ; Tang, Yi 1 ; Zheng, Yangxia 1 ; Li, Huanxiu 1 ; Zhang, Fen 1 ; Sun, Bo 1 ;
作者机构： 1.Sichuan Agr Univ, Coll Hort, Chengdu 611130, Peoples R China
2.Bijie Inst Agr Sci, Bijie 551700, Peoples R China
3.Sichuan Acad Agr Sci, Rice & Sorghum Res Institue, Deyang 618000, Peoples R China
4.Vegetable Germplasm Innovat & Variety Improvement, Chengdu 610300, Peoples R China
5.Chengdu Agr Coll, Sch Agr & Hort, Chengdu 611130, Peoples R China
关键词： brassinosteroids; drought stress; photosynthesis; antioxidant system; abscisic acid; drought-responsive gene; potato
期刊名称：ANTIOXIDANTS （ 影响因子：7.675； 五年影响因子：7.886 ）
ISSN：
年卷期： 2022 年 11 卷 9 期
页码：
收录情况： SCI
摘要： Drought stress is a key factor limiting the growth and tuber yield of potatoes (Solanum tuberosum L.). Brassinosteroids (BRs) have been shown to alleviate drought stress in several plant species; however, little is known about the physiological and molecular mechanisms by which BRs enhance drought resistance in potatoes. Here, we characterized changes in the physiology and transcriptome of the tetraploid potato variety 'Xuanshu-2 ' in response to drought stress after 24-epibrassinolide (EBR) pretreatment. The abscisic acid (ABA) content, photosynthetic capacity, and the activities of antioxidant enzymes were increased; the intercellular CO2 concentration, relative conductivity, reactive oxygen species, malondialdehyde, proline, and soluble sugar content were decreased after EBR pretreatment compared with plants under drought stress. Transcriptome analysis revealed 1330 differently expressed genes (DEGs) involved in the response to drought stress after EBR pretreatment. DEGs were enriched in plant hormone signal transduction, starch and sucrose metabolism, circadian rhythm, flavonoid biosynthesis, and carotenoid biosynthesis. DEGs associated with the BR signaling and biosynthesis pathways, as well as ABA metabolic pathways were identified. Our findings provide new insights into the mechanisms by which BRs enhance the drought resistance of potatoes.
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