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OsBZR4 regulates temperature-dependent embryogenesis in rice
Zhenyu Wang1, Min Xu1,2, Yingxiang Liu1,2
1Northeast Institute of Geography and Agroecology, State Key Laboratory of Black Soils Conservation and Utilization, Key Laboratory of Soybean Molecular Design Breeding, Chinese Academy of Sciences, Harbin, China.
Mutations in OsBZR4 cause embryoless rice, a trait valuable for seed development studies and breeding. Manipulating OsBZR4 offers potential for novel rice production technologies.
Area of Science:
- Plant Biology
- Genetics
- Agricultural Science
Background:
- Embryoless rice offers significant potential for studying early seed development and crop improvement.
- Research on the genetic basis and manipulation of embryoless rice remains limited.
Purpose of the Study:
- To investigate the genetic factors controlling embryoless seed formation in rice.
- To explore the potential of manipulating embryoless traits for agricultural applications.
Main Methods:
- Genetic analysis of OsBZR4 mutations in rice (Oryza sativa).
- Investigated OsBZR4 expression patterns and its role in regulating auxin homeostasis.
- Assessed the impact of exogenous auxin, gene overexpression, and temperature on embryoless seed development.
Main Results:
- Mutations in OsBZR4 resulted in 60-100% embryoless seeds across various rice cultivars.
- OsBZR4 regulates auxin levels at the scutellum-endosperm interface by repressing YUC4 and PIN5b.
- High temperatures and OsPIL13 overexpression exacerbated the embryoless phenotype in bzr4 mutants.
Conclusions:
- OsBZR4 is a key regulator of embryoless seed development in rice, influencing auxin distribution.
- Manipulation of OsBZR4 can create thermosensitive embryoless rice varieties with enhanced storability.
- This research opens avenues for developing novel rice production technologies and improving grain yield.
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