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Interactions between Brassinosteroids and Strigolactones in Alleviating Salt Stress in Maize
Xinqi Wang1,2,3, Xue Qi1,2,3, Zelong Zhuang1,2,3
1College of Agronomy, Gansu Agricultural University, Lanzhou 730070, China.
International Journal of Molecular Sciences
|October 16, 2024
Summary
Exogenous brassinolide (BR) and strigolactones (SLs) mitigate salt stress in maize by improving root physiology and regulating key gene expression pathways. This hormonal interaction enhances plant resilience to salinity.
Area of Science:
- Plant Physiology
- Molecular Biology
- Agricultural Science
Background:
- Salt stress severely impacts maize growth and development.
- Brassinosteroids (BR) and strigolactones (SLs) are known to play roles in plant stress responses.
- Understanding their combined effect under salinity is crucial for crop improvement.
Purpose of the Study:
- To investigate the morphological and physiological effects of exogenous BR and SL, individually and in combination, on maize under salt stress.
- To elucidate the molecular mechanisms, including gene expression changes, underlying salt tolerance induced by BR and SL.
- To identify candidate genes involved in regulating maize seedling length under salt stress.
Main Methods:
- Phenotypic analysis of maize seedlings under salt stress with hormone treatments.
- Measurement of physiological parameters like Na+ content and oxidase activity in roots.
- Transcriptome analysis to identify differentially expressed genes and pathways.
- Weighted Gene Co-expression Network Analysis (WGCNA) to screen for candidate genes.
Main Results:
- Salt stress inhibited maize growth and increased root Na+ content.
- Exogenous BR and SL treatments enhanced oxidase activity, reduced Na+ content, and mitigated salt stress effects.
- Transcriptome analysis revealed BR-SL interaction impacts photosynthesis, TCA cycle, and hormone signaling pathways.
- Hormonal treatments modulated expression of genes related to CK, GA, IAA, BR, ABA, JA signaling and inhibited AKT2/3 genes.
Conclusions:
- BR and SL act synergistically to alleviate salt stress in maize.
- The combined application of BR and SL influences critical metabolic and signaling pathways, enhancing salt tolerance.
- Candidate genes identified through WGCNA provide insights into the genetic regulation of salt tolerance and seedling growth in maize.
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