Journal
FRONTIERS IN PLANT SCIENCE
Volume 13, Issue -, Pages -Publisher
FRONTIERS MEDIA SA
DOI: 10.3389/fpls.2022.1064685
Keywords
legume; mungbean; plant architecture; MIB1; MATE; DTX family; RNA-Seq
Categories
Funding
- Science Foundation of Jiangsu Province, China
- Jiangsu Seed Industry Revitalization Project
- Jiangsu Agricultural Science and Technology Innovation Fund of China
- Students' innovation and entrepreneurship training program of National experimental Teaching Center for Plant Production
- [BE2021718]
- [JBGS[2021]004]
- [CX(20)3030]
- [ZKF202212]
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The MIB1 gene in mungbean, which encodes a MATE/DTX family protein, was found to be involved in the control of plant architecture establishment. Overexpression of MIB1 partially rescued the shortened pod phenotype in Arabidopsis, and transcriptomic analysis revealed altered expression levels of genes related to phytohormone pathways and developmental regulation in the mib1 mutants, indicating the crucial role of MIB1 in mungbean.
It has been shown that multidrug and toxic compound extrusion/detoxification (MATE/DTX) family transporters are involved in the regulation of plant development and stress response. Here, we characterized the mini body1 (mib1) mutants in mungbean, which gave rise to increased branches, pentafoliate compound leaves, and shortened pods. Map-based cloning revealed that MIB1 encoded a MATE/DTX family protein in mungbean. qRT-PCR analysis showed that MIB1 was expressed in all tissues of mungbean, with the highest expression level in the young inflorescence. Complementation assays in Escherichia coli revealed that MIB1 potentially acted as a MATE/DTX transporter in mungbean. It was found that overexpression of the MIB1 gene partially rescued the shortened pod phenotype of the Arabidopsis dtx54 mutant. Transcriptomic analysis of the shoot buds and young pods revealed that the expression levels of several genes involved in the phytohormone pathway and developmental regulators were altered in the mib1 mutants. Our results suggested that MIB1 plays a key role in the control of plant architecture establishment in mungbean.
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