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The basic helix-loop-helix transcription factor OsBLR1 regulates leaf angle in rice via brassinosteroid signalling
Kun Wang1, Meng-Qi Li1, Yan-Peng Chang2
1College of Agronomy, Henan Agricultural University, Zhengzhou, 450002, Henan, China.
Plant Molecular Biology
|February 7, 2020
Summary
Oryza sativa BRASSINOSTEROID-RESPONSIVE LEAF ANGLE REGULATOR 1 (OsBLR1) positively regulates brassinosteroid signaling in rice, increasing leaf angle and grain length. OsBLR1 acts in BR signal transduction, influencing cell wall composition and plant development.
Area of Science:
- Plant Biology
- Molecular Genetics
- Agricultural Science
Background:
- Leaf angle is crucial for plant architecture and crop yield in rice (Oryza sativa L.).
- Brassinosteroids (BRs) are key regulators of plant development, particularly leaf angle in monocots.
- The BR signaling pathway involves complex interactions with several uncharacterized components.
Purpose of the Study:
- To investigate the role of Oryza sativa BRASSINOSTEROID-RESPONSIVE LEAF ANGLE REGULATOR 1 (OsBLR1) in rice development.
- To determine OsBLR1's function in brassinosteroid (BR) signaling and its impact on leaf angle and grain length.
- To elucidate the molecular mechanisms by which OsBLR1 influences plant architecture.
Main Methods:
- Gene expression analysis of OsBLR1 in overexpression and knockout mutant lines.
- Phenotypic characterization of transgenic rice lines, including leaf angle, grain length, and organ elongation.
- Biochemical assays to assess BR sensitivity, endogenous BR content, cell wall composition (cellulose, protopectin), and protein interactions (yeast two-hybrid, GST pull-down).
Main Results:
- Overexpression of OsBLR1 increased leaf angle and grain length, while knockout mutants exhibited erect leaves and shorter grains.
- OsBLR1-overexpressing lines showed increased sensitivity to BR, whereas knockout mutants displayed reduced sensitivity.
- OsBLR1 affects cell wall composition, reducing cellulose and protopectin, leading to altered leaf angle. OsRLI1 was identified as a potential downstream target, and OsRACK1A as an interaction protein.
Conclusions:
- OsBLR1, a bHLH transcription factor, positively regulates BR signaling in rice.
- OsBLR1 plays a significant role in controlling leaf angle and grain length by modulating BR signal transduction and cell wall properties.
- OsBLR1 is a key component in the BR pathway influencing rice plant architecture and potentially crop yield.
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