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Crosstalk between cytokinin and ethylene signaling pathways regulates leaf abscission in cotton in response to chemical defoliants

文献类型： 外文期刊

作者： Xu, Jiao 1 ; Chen, Lin 1 ; Sun, Heng 1 ; Wusiman, Nusireti 2 ; Sun, Weinan 1 ; Li, Baoqi 1 ; Gao, Yu 1 ; Kong, Jie 2 ; Zhang 1 ;

作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Natl Ctr Plant Gene Res Wuhan, Natl Key Lab Crop Genet Improvement, Wuhan, Hubei, Peoples R China

2.Xinjiang Acad Agr Sci, Inst Econ Crops, Urumqi 830091, Xinjiang, Peoples R China

关键词： Cotton; cytokinin signaling; defoliant; ethylene signaling; GhCKX3; leaf abscission

期刊名称：JOURNAL OF EXPERIMENTAL BOTANY （ 影响因子：6.992； 五年影响因子：7.86 ）

ISSN： 0022-0957

年卷期： 2019 年 70 卷 5 期

页码：

收录情况： SCI

摘要： Abscission is a process that allows plants to shed tissues or organs via cell separation, and occurs throughout the life cycle. Removal of leaves through the use of chemical defoliants is very important for mechanical harvesting of cotton (Gossypium hirsutum). However, our knowledge of the molecular mechanisms of the defoliation response involved is limited. In this study, RNA-seq was conducted in order to profile the differentially expressed genes (DEGs) between cultivars X50 (sensitive to chemical defoliants) and X33 (relatively insensitive) at different time points after treatment with thidiazuron and ethephon (TE). A total of 2434 DEGs were identified between the two cultivars across the different time-points. Functional categories according to GO and KEGG analyses revealed that plant hormone signal transduction and zeatin biosynthesis were involved in the response to TE. Cytokinin oxidase/dehydrogenase (CKX) genes and ethylene-related genes were up-regulated following TE treatment, and were associated with increased level of ethylene, especially in cultivar X50. Down-regulation of GhCKX3 resulted in delayed defoliation and a reduced ethylene response. The results show that crosstalk between cytokinin and ethylene regulates cotton defoliation, and provide new insights into the molecular mechanisms underlying the mode of action of defoliants in cotton.

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