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光周期应激反应在 中取决于生长素作为保护细胞分裂素的拮抗剂。

The Photoperiod Stress Response in Depends on Auxin Acting as an Antagonist to the Protectant Cytokinin.

机构信息

Institute of Biology/Applied Genetics, Dahlem Centre of Plant Sciences (DCPS), Freie Universität Berlin, D-14195 Berlin, Germany.

Laboratory of Growth Regulators, Faculty of Science, Palacký University & Institute of Experimental Botany, The Czech Academy of Sciences, Šlechtitelů 27, CZ-783 71 Olomouc, Czech Republic.

出版信息

Int J Mol Sci. 2022 Mar 8;23(6):2936. doi: 10.3390/ijms23062936.

DOI:10.3390/ijms23062936
PMID:35328357
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8955046/
Abstract

Fluctuating environmental conditions trigger adaptive responses in plants, which are regulated by phytohormones. During photoperiod stress caused by a prolongation of the light period, cytokinin (CK) has a protective function. Auxin often acts as an antagonist of CK in developmental processes and stress responses. Here, we investigated the regulation of the photoperiod stress response in by auxin and its interaction with CK. Transcriptome analysis revealed an altered transcript abundance of numerous auxin metabolism and signaling genes after photoperiod stress treatment. The changes appeared earlier and were stronger in the photoperiod-stress-sensitive CK receptor mutant (), compared to wild-type plants. The concentrations of indole-3-acetic acid (IAA), IAA-Glc and IAA-Asp increased in both genotypes, but the increases were more pronounced in . Genetic analysis revealed that the gain-of-function () mutant, , displayed an increased photoperiod stress sensitivity. In contrast, a loss of the auxin receptors TRANSPORT-INHIBITOR-RESISTANT 1 (TIR1), AUXIN SIGNALING F-BOX 2 (AFB2) and AFB3 in wild-type and background caused a reduced photoperiod stress response. Overall, this study revealed that auxin promotes response to photoperiod stress antagonizing the protective CK.

摘要

环境条件的波动会引发植物的适应性反应，这些反应受植物激素调节。在由光照时间延长引起的光周期胁迫期间，细胞分裂素（CK）具有保护作用。生长素在发育过程和应激反应中通常作为 CK 的拮抗剂。在这里，我们研究了生长素及其与 CK 的相互作用对光周期胁迫反应的调节。转录组分析显示，光周期胁迫处理后，大量生长素代谢和信号基因的转录丰度发生改变。与野生型植物相比，光周期胁迫敏感的 CK 受体突变体 （）中的变化出现得更早且更强。两种基因型的吲哚-3-乙酸（IAA）、IAA-Glc 和 IAA-Asp 浓度均增加，但 中的增加更为明显。遗传分析表明，功能获得型 （）突变体 ，表现出增强的光周期胁迫敏感性。相比之下，在野生型和 背景中，生长素受体 TRANSPORT-INHIBITOR-RESISTANT 1（TIR1）、AUXIN SIGNALING F-BOX 2（AFB2）和 AFB3 的缺失导致光周期胁迫反应减弱。总的来说，这项研究表明，生长素通过拮抗保护型 CK 来促进对光周期胁迫的响应。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/3ee0af50ed65/ijms-23-02936-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/c1371348338c/ijms-23-02936-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/6604f0948f2e/ijms-23-02936-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/a72b6cf4c66d/ijms-23-02936-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/6a3a90fd7e1b/ijms-23-02936-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/5dc259fa2740/ijms-23-02936-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/3ee0af50ed65/ijms-23-02936-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/c1371348338c/ijms-23-02936-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/6604f0948f2e/ijms-23-02936-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/a72b6cf4c66d/ijms-23-02936-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5824/8955046/6a3a90fd7e1b/ijms-23-02936-g004.jpg
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