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

Bibliographische Detailangaben
Veröffentlicht in:	Journal of experimental botany. - 1985. - 70(2019), 5 vom: 11. März, Seite 1525-1538
1. Verfasser:	Xu, Jiao (VerfasserIn)
Weitere Verfasser:	Chen, Lin, Sun, Heng, Wusiman, Nusireti, Sun, Weinan, Li, Baoqi, Gao, Yu, Kong, Jie, Zhang, Dawei, Zhang, Xianlong, Xu, Haijiang, Yang, Xiyan
Format:	Online-Aufsatz
Sprache:	English
Veröffentlicht:	2019
Zugriff auf das übergeordnete Werk:	Journal of experimental botany
Schlagworte:	Journal Article Research Support, Non-U.S. Gov't Cotton GhCKX3 cytokinin signaling defoliant ethylene signaling leaf abscission Cytokinins Defoliants, Chemical mehr... Ethylenes Organophosphorus Compounds Phenylurea Compounds Plant Growth Regulators Thiadiazoles thidiazuron 0091WH7STF ethephon XU5R5VQ87S

Beschreibung
Zusammenfassung:	© The Author(s) 2019. Published by Oxford University Press on behalf of the Society for Experimental Biology. 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
Beschreibung:	Date Completed 18.05.2020 Date Revised 18.05.2020 published: Print Citation Status MEDLINE
ISSN:	1460-2431
DOI:	10.1093/jxb/erz036