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噻苯隆与环丙酰菌胺组合可调节棉花中的激素途径和活性氧系统，在低温下增加落叶。

Thidiazuron combined with cyclanilide modulates hormone pathways and ROS systems in cotton, increasing defoliation at low temperatures.

作者信息

Shu Hongmei, Sun Shangwen, Wang Xiaojing, Chen Jian, Yang Changqin, Zhang Guowei, Han Huanyong, Li Zhikang, Liang Ting, Liu Ruixian

机构信息

Institute of Industrial Crops, Jiangsu Academy of Agricultural Sciences/Key Laboratory of Cotton and Rapeseed, Ministry of Agriculture and Rural Affairs, Nanjing, China.

Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, China.

出版信息

Front Plant Sci. 2024 Apr 3;15:1333816. doi: 10.3389/fpls.2024.1333816. eCollection 2024.

DOI:10.3389/fpls.2024.1333816
PMID:38633458
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11021790/
Abstract

Low temperatures decrease the thidiazuron (TDZ) defoliation efficiency in cotton, while cyclanilide (CYC) combined with TDZ can improve the defoliation efficiency at low temperatures, but the mechanism is unknown. This study analyzed the effect of exogenous TDZ and CYC application on cotton leaf abscissions at low temperatures (daily mean temperature: 15°C) using physiology and transcriptomic analysis. The results showed that compared with the TDZ treatment, TDZ combined with CYC accelerated cotton leaf abscission and increased the defoliation rate at low temperatures. The differentially expressed genes (DEGs) in cotton abscission zones (AZs) were subjected to Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses to compare the enriched GO terms and KEGG pathways between the TDZ treatment and TDZ combined with CYC treatment. TDZ combined with CYC could induce more DEGs in cotton leaf AZs at low temperatures, and these DEGs were related to plant hormone and reactive oxygen species (ROS) pathways. CYC is an auxin transport inhibitor. TDZ combined with CYC not only downregulated more auxin response related genes but also upregulated more ethylene and jasmonic acid (JA) response related genes at low temperatures, and it decreased the indole-3-acetic acid (IAA) content and increased the JA and 1-aminocyclopropane-1-carboxylic acid (ACC) contents, which enhanced cotton defoliation. In addition, compared with the TDZ treatment alone, TDZ combined with CYC upregulated the expression of () genes and the hydrogen peroxide content in cotton AZs at low temperatures, which accelerated cotton defoliation. These results indicated that CYC enhanced the TDZ defoliation efficiency in cotton by adjusting hormone synthesis and response related pathways (including auxin, ethylene, and JA) and ROS production at low temperatures.

摘要

低温会降低棉花中噻苯隆（TDZ）的脱叶效率，而环丙酰草胺（CYC）与TDZ联合使用可提高低温下的脱叶效率，但其作用机制尚不清楚。本研究通过生理学和转录组分析，探讨了外源施用TDZ和CYC对低温（日平均温度：15°C）下棉花叶片脱落的影响。结果表明，与TDZ处理相比，TDZ与CYC联合使用可加速棉花叶片脱落，并提高低温下的脱叶率。对棉花脱落区（AZs）中的差异表达基因（DEGs）进行基因本体论（GO）和京都基因与基因组百科全书（KEGG）分析，以比较TDZ处理与TDZ联合CYC处理之间富集的GO术语和KEGG途径。TDZ与CYC联合使用可在低温下诱导棉花叶片AZs中更多的DEGs，这些DEGs与植物激素和活性氧（ROS）途径有关。CYC是一种生长素运输抑制剂。TDZ与CYC联合使用不仅在低温下下调了更多与生长素反应相关的基因，还上调了更多与乙烯和茉莉酸（JA）反应相关的基因，并且降低了吲哚-3-乙酸（IAA）含量，增加了JA和1-氨基环丙烷-1-羧酸（ACC）含量，从而增强了棉花脱叶效果。此外，与单独使用TDZ处理相比，TDZ与CYC联合使用在低温下上调了棉花AZs中（）基因的表达和过氧化氢含量，加速了棉花脱叶。这些结果表明，CYC通过在低温下调节激素合成和反应相关途径（包括生长素、乙烯和JA）以及ROS产生，提高了棉花中TDZ的脱叶效率。

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本文引用的文献

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2
Jasmonic Acid Activates the Fruit-Pedicel Abscission Zone of 'Thompson Seedless' Grapes, Especially with Co-Application of 1-Aminocyclopropane-1-carboxylic Acid.茉莉酸可激活‘汤普森无核’葡萄的果梗离层区，尤其是与1-氨基环丙烷-1-羧酸共同施用时。
Plants (Basel). 2022 May 5;11(9):1245. doi: 10.3390/plants11091245.
3
The HD-Zip transcription factor SlHB15A regulates abscission by modulating jasmonoyl-isoleucine biosynthesis.
HD-Zip 转录因子 SlHB15A 通过调节茉莉酸异亮氨酸生物合成来调控细胞分离。
Plant Physiol. 2022 Aug 1;189(4):2396-2412. doi: 10.1093/plphys/kiac212.
4
Thidiazuron Promotes Leaf Abscission by Regulating the Crosstalk Complexities between Ethylene, Auxin, and Cytokinin in Cotton.噻苯隆通过调控棉花中乙烯、生长素和细胞分裂素的交叉通讯复杂性促进叶片脱落。
Int J Mol Sci. 2022 Feb 28;23(5):2696. doi: 10.3390/ijms23052696.
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