The INFLORESCENCE DEFICIENT IN ABSCISSION-LIKE6 Peptide Functions as a Positive Modulator of Leaf Senescence in Arabidopsis thaliana

• Published in: Frontiers in plant science Vol. 13; p. 909378
• Main Authors: Guo, Cun, Li, Xiaoxu, Zhang, Zenglin, Wang, Qi, Zhang, Zhenbiao, Wen, Lichao, Liu, Cheng, Deng, Zhichao, Chu, Yumeng, Liu, Tao, Guo, Yongfeng
• Format: Journal Article
• Language: English
• Published: Switzerland Frontiers Media S.A 30.06.2022
• Subjects: Arabidopsis; IDL6; leaf senescence; phytohormone; plant peptide; Plant Science; transcriptome analysis; plant peptide; transcriptome analysis; Arabidopsis; IDL6; leaf senescence; phytohormone
• ISSN: 1664-462X; 1664-462X
• DOI: 10.3389/fpls.2022.909378

Leaf senescence is a highly coordinated process and has a significant impact on agriculture. Plant peptides are known to act as important cell-to-cell communication signals that are involved in multiple biological processes such as development and stress responses. However, very limited number of peptides has been reported to be associated with leaf senescence. Here, we report the characterization of the INFLORESCENCE DEFICIENT IN ABSCISSION-LIKE6 (IDL6) peptide as a regulator of leaf senescence. The expression of was up-regulated in senescing leaves. Exogenous application of synthetic IDL6 peptides accelerated the process of leaf senescence. The mutant plants showed delayed natural leaf senescence as well as senescence included by darkness, indicating a regulatory role of IDL6 peptides in leaf senescence. The role of IDL6 as a positive regulator of leaf senescence was further supported by the results of overexpression analysis and complementation test. Transcriptome analysis revealed differential expression of phytohormone-responsive genes in mutant plants. Further analysis indicated that altered expression of IDL6 led to changes in leaf senescence phenotypes induced by ABA and ethylene treatments. The results from this study suggest that the IDL6 peptide positively regulates leaf senescence in .