https://scholars.lib.ntu.edu.tw/handle/123456789/627562
標題: | Involvement of microRNA164 in responses to heat stress in Arabidopsis | 作者: | Tsai, Wei-An Sung, Po-Han Kuo, Yun-Wei Chen, Ming-Cheng SHIH-TONG JENG Lin, Jeng-Shane |
關鍵字: | Chlorophyll; H(2)O(2); HSPs; MiR164; MiRNA; Thermotolerance | 公開日期: | 16-一月-2023 | 出版社: | Elsevier Ireland Ltd | 卷: | 329 | 期: | 111598 | 來源出版物: | Plant science : an international journal of experimental plant biology | 摘要: | MicroRNAs (miRNAs) are considered to be integral parts of plant stress regulatory networks. Under long-term heat stress, miR164 is induced. Conversely, its targets are repressed. Transgenic overexpressors (164OE) and mutants of MIR164 (mir164) were used to study miR164's functions during heat responses. Target gene expression decreased in 164OE transgenic plants and increased in mir164a-4 and mir164b mutants. Under heat stress, the mir164 mutants presented heat-sensitive phenotypes, while 164OE transgenic plants showed better thermotolerance than wild-type (WT) plants. Overexpression of miR164 decreased heat-inhibition of hypocotyl lengths. Under heat stress, miR164 target genes modulated the expression of chlorophyll b reductase and chlorophyll catabolic genes, reducing the chlorophyll a/b ratio. More H2O2 accumulated in the mir164 mutants under heat stress, which may have caused oxidative damage. In addition, expression of HSPs was altered in the experimental plants compared to that of the WT. Overall, miR164 influenced target gene expression, altering development, chlorophyll a/b ratio, H2O2-caused damage, and HSPs expression under long-term heat stress. These phenomena, in turn, likely influence the thermotolerance of plants. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/627562 | ISSN: | 01689452 | DOI: | 10.1016/j.plantsci.2023.111598 |
顯示於: | 植物科學研究所 |
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