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Plant function and evolutionary biology
RESEARCH ARTICLE

The molecular events underpinning cultivar differences in melatonin counteracting salt damage in Phaseolus vulgaris

Yiqiang Han https://orcid.org/0000-0002-2002-2851 A B , Yamei Gao A C , Ming Li D , Yanli Du D , Yuxian Zhang B D , Wenhui Zhang D and Jidao Du B D *
+ Author Affiliations
- Author Affiliations

A College of Life Science and Technology, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang Province, P. R. China.

B National Coarse Cereals Engineering Research Center, Daqing 163319, Heilongjiang Province, P. R. China.

C Heilongjiang Provincial Key Laboratory of Environmental Microbiology and Recycling of Argo-Waste in the Cold Region, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang Province, P. R. China.

D College of Agriculture, Heilongjiang Bayi Agricultural University, Daqing 163319, Heilongjiang Province, P. R. China.

* Correspondence to: djdbynd@163.com

Handling Editor: Honghong Wu

Functional Plant Biology 49(2) 201-217 https://doi.org/10.1071/FP21126
Submitted: 27 April 2021  Accepted: 13 November 2021   Published: 7 December 2021

© 2022 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Melatonin (N-acetyl-5-methoxytryptamine) plays important roles in multiple stress responses, especially under salt stress. However, cultivar differences in melatonin mediated salt stress tolerance are unclear. Phaseolus vulgaris L. (common bean) cultivars Jiyin 1 (JY, salt-tolerant) and Xuliyabai (XL, salt-sensitive) were used in this study. Exogenous melatonin significantly improved root growth under salt stress in JY, but had little effect on XL. Physiology analysis showed significant differences in activities of antioxidant enzymes (superoxide, SOD; and catalase, CAT) and malondialdehyde content between JY and XL. Meanwhile, the change of ABA content in JY and XL root was opposite in salt plus melatonin treatment. Comparative root transcriptomes of JY and XL revealed 3505 and 668 differentially expressed genes (DEGs) regulated by salt stress and melatonin. The most enriched melatonin-responsive genes under salt stress are mainly involved in regulation of transcription, oxidation–reduction process, transcription factor activity, oxidoreductase activity. In addition, melatonin induced more obvious changes of DEGs in JY than that in XL under salt condition. Melatonin also significantly induced 41 DEGs only in JY, including signal transduction genes, transcription factors, ubiquitin protein ligases, ion homeostasis and osmotic adjustment genes etc. This study uncovered the molecular mechanism of cultivar difference of melatonin response under salt stress in common bean.

Keywords: ABA, antioxidant enzyme, cultivar difference, melatonin, Phaseolus vulgaris, root, salt stress, transcriptome.


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