AI Article Synopsis
- The hybrid rice derived from indica and japonica subspecies has the potential for higher yields compared to the common indica-indica hybrids, but differences in flowering times pose a challenge.
- Researchers identified OsMYB8 as a crucial gene regulating the timing of floret opening in rice, which influences flowering synchronization between the indica and japonica lines.
- The study suggests that modifying the OsMYB8 gene from indica into japonica can enhance floret opening timing, providing a promising strategy for breeding improved indica-japonica hybrid rice.
Article Abstract
The inter-subspecific indica-japonica hybrid rice confer potential higher yield than the widely used indica-indica intra-subspecific hybrid rice. Nevertheless, the utilization of this strong heterosis is currently hindered by asynchronous diurnal floret opening time (DFOT) of indica and japonica parental lines. Here, we identify OsMYB8 as a key regulator of rice DFOT. OsMYB8 induces the transcription of JA-Ile synthetase OsJAR1, thereby regulating the expression of genes related to cell osmolality and cell wall remodeling in lodicules to promote floret opening. Natural variations of OsMYB8 promoter contribute to its differential expression, thus differential transcription of OsJAR1 and accumulation of JA-Ile in lodicules of indica and japonica subspecies. Furthermore, introgression of the indica haplotype of OsMYB8 into japonica effectively promotes DFOT in japonica. Our findings reveal an OsMYB8-OsJAR1 module that regulates differential DFOT in indica and japonica, and provide a strategy for breeding early DFOT japonica to facilitate breeding of indica-japonica hybrids.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10937712 | PMC |
| http://dx.doi.org/10.1038/s41467-024-46579-z | DOI Listing |
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