AI Article Synopsis
- * Researchers discovered that a rare variation in the qRBG1 promoter leads to increased expression, resulting in larger rice grains, while its overexpression leads to smaller grains.
- * The qRBG1 gene encodes a protein called OsBZR5, which interacts with other proteins to form a regulatory network that influences grain size, providing insights for enhancing rice production.
Article Abstract
Seed size, a key determinant of rice yield, is regulated by brassinosteroid (BR); however, the BR pathway in rice has not been fully elucidated. Here, we report the cloning and characterization of the quantitative trait locus Rice Big Grain 1 (qRBG1) from single-segment substitution line Z499. Our data show that qRBG1 is an unselected rare promoter variation that reduces qRBG1 expression to increase cell number and size, resulting in larger grains, whereas qRBG1 overexpression causes smaller grains in recipient Nipponbare. We demonstrate that qRBG1 encodes a non-canonical BES1 (Bri1-EMS-Suppressor1)/BZR1(Brassinazole-Resistant1) family member, OsBZR5, that regulates grain size upon phosphorylation by OsGSK2 (GSK3-like Kinase2) and binding to D2 (DWARF2) and OFP1 (Ovate-Family-Protein1) promoters. qRBG1 interacts with OsBZR1 to synergistically repress D2, and to antagonistically mediate OFP1 for grain size. Our results reveal a regulatory network controlling grain size via OsGSK2-qRBG1-OsBZR1-D2-OFP1 module, providing a target for improving rice yield.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11449933 | PMC |
| http://dx.doi.org/10.1038/s41467-024-52928-9 | DOI Listing |
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