Natural variations in grain length 10 (GL10) regulate rice grain size
Penglin Zhan1, Shuaipeng Ma2, Zhili Xiao2
1Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, Guangdong 510642, China; State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangdong Provincial Key Laboratory of Plant Molecular Breeding, South China Agricultural University, Guangzhou, Guangdong 510642, China.
Journal of Genetics and Genomics = Yi Chuan Xue Bao
|February 13, 2022
Summary
A newly identified gene, MADS56 (GL10), positively controls rice grain size. Natural variations in GL10, including a deletion, significantly impact grain length, weight, and flowering time, offering breeding potential.
Area of Science:
- Plant genetics and breeding
- Molecular biology of crop development
Background:
- Grain size is crucial for rice yield, but natural variations in related genes are understudied.
- Understanding genetic factors influencing grain size is key to improving rice cultivars.
Purpose of the Study:
- To identify and characterize natural variations in genes controlling rice grain length and weight.
- To elucidate the molecular mechanism by which GL10 (MADS56) regulates grain size.
Main Methods:
- Quantitative Trait Locus (QTL) analysis to identify the GL10 gene.
- Gene knockout and overexpression studies in rice to assess phenotypic effects.
- Analysis of gene expression and hormone signaling pathways.
Main Results:
- The MADS56 gene (GL10) was identified as a positive regulator of rice grain length and weight.
- A natural deletion in GL10 causes reduced grain size and delayed flowering.
- Overexpression of GL10 increases grain length and weight and advances flowering.
- GL10 promotes longitudinal cell growth in the glume and influences gibberellic acid (GA) signaling.
Conclusions:
- Allelic variation in GL10 (MADS56) contributes to differences in rice grain size among cultivars.
- GL10 is a valuable target for breeding rice varieties with improved grain characteristics.
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