6‐Benzyladenine increasing subsequent waterlogging‐induced waterlogging tolerance of summer maize by increasing hormone signal transduction. Issue 1 (11th November 2021)

• Record Type: Journal Article
• Authors: Hu, Juan; Ren, Baizhao; Dong, Shuting; Liu, Peng; Zhao, Bin; Zhang, Jiwang
• Is Part Of: Annals of the New York Academy of Sciences. Volume 1509:Issue 1(2022)
• Page Start: 89
• Page End: 112
• Publication Date: 2021-11-11
• Subjects: 6‐benzyladenine -- hormone -- mitogen‐activated protein kinase -- summer maize -- waterlogging; Medical sciences -- Periodicals; Medicine -- Periodicals; Science -- Periodicals; 610
• DOI: 10.1111/nyas.14708
• Languages: English
• ISSNs: 0077-8923

Abstract

Abstract: Summer maize is frequently subjected to waterlogging damage because of increased and variable rainfall during the growing season. The application of 6‐benzyladenine (6‐BA) can effectively mitigate the waterlogging effects on plant growth and increase the grain yield of waterlogged summer maize. However, the mechanisms underlying this process and the involvement of 6‐BA in relevant signal transduction pathways remain unclear. In this study, we explored the effects of 6‐BA on waterlogged summer maize using a phosphoproteomic technique to better understand the mechanism by which summer maize growth improves following waterlogging. Application of 6‐BA inhibited the waterlogging‐induced increase in abscisic acid (ABA) content and increased the phosphorylation levels of proteins involved in ABA signaling; accordingly, stomatal responsiveness to exogenous ABA increased. In addition, the application of 6‐BA had a long‐term effect on signal transduction pathways and contributed to rapid responses to subsequent stresses. Plants primed with 6‐BA accumulated more ethylene and jasmonic acid in response to subsequent waterlogging; accordingly, leaf SPAD, antioxidase activity, and root traits improved by 6‐BA priming. These results suggest that the effects of 6‐BA on hormone signal transduction pathways are anamnestic, which enables plants to show faster or stronger defense responses to stress. Abstract : Our results suggest that the application of exogenous 6‐BA effectively decreases the ABA content of waterlogged summer maize. However, ABA signal transduction in response to stressed conditions was increased by application of 6‐BA, giving rise to water‐saving and antitranspirant activity. This may contribute to improving ABA‐promoted growth under stressed conditions and mitigating ABA inhibition of plant growth under nonstressed conditions.