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Comparative Transcriptomic Analysis Reveals the Involvement of Auxin Signaling in the Heat Tolerance of Pakchoi under High-Temperature Stress

文献类型： 外文期刊

作者： Yang, Bing 1 ; Chen, Yaosong 1 ; Li, Xiaofeng 1 ; Gao, Lu 1 ; Miao, Liming 1 ; Song, Yishan 2 ; Zhang, Dingyu 1 ; Zhu, Hongfang 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Hort Res Inst, Shanghai Key Lab Protected Hort Technol, Shanghai 201403, Peoples R China

2.Shanghai Ocean Univ, Coll Food Sci & Technol, Shanghai 201306, Peoples R China

关键词： pakchoi; heat stress; auxin signal; heat shock protein; heat shock factor

期刊名称：AGRONOMY-BASEL （ 影响因子：3.4； 五年影响因子：3.8 ）

ISSN：

年卷期： 2024 年 14 卷 8 期

页码：

收录情况： SCI

摘要： Pakchoi is a kind of nonheading Chinese cabbage being widely cultivated not only in China but also all over Asia. High temperature is a major limiting factor influencing the yield and quality of pakchoi, while the mechanism of pakchoi dealing with high-temperature challenges remains largely elusive. In the present study, we conducted a comparative transcriptomic analysis, which was also validated by qPCR, of the heat-tolerant Xinxiaqing (XXQ) variant and Suzhouqing (SZQ) variant, which are heat-sensitive under high-temperature treatment. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses suggest that high-temperature-induced phytohormones signal transduction, especially auxin signal transduction, regulates the heat responses of pakchoi. Our further investigations imply that high-temperature-activated auxin signal plays a positive role in helping pakchoi deal with high-temperature challenge; IAA-pretreated pakchoi plants exhibited greater resistance to the high-temperature treatment, probably due to the induction of antioxidant activity. In addition, our study also identified six heat shock proteins/factors (HSPs/HSFs) whose up-regulation correlates with the elevated heat tolerance of pakchoi. Notably, among these high-temperature-induced heat-responsive factors, HSP20 and HSP26.5 are under the regulation of auxin signal, and this signal cascade contributes to enhancing the thermostability of pakchoi. In the present study, we identified crucial high-temperature-responsive factors and signaling pathways in pakchoi, which help in understanding the mechanism of pakchoi coping with high-temperature challenge.

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