GRAIN LENGTH AND AWN 1 negatively regulates grain size in rice

作者：Tao Wang, Ting Zou, Zhiyuan He, Guoqiang Yuan, Tao Luo, Jun Zhu, Yueyang Liang, Qiming Deng, Shiquan Wang, Aiping Zheng, Huainian Liu, Lingxia Wang, Ping Li, Shuangcheng Li · 发表于：Journal of Integrative Plant Biology · 年份：2018 · DOI：10.1111/jipb.12736 · 被引用次数：43 · 研究领域：Genetic Mapping and Diversity in Plants and Animals、Plant nutrient uptake and metabolism、GABA and Rice Research

Grain size is an important factor determining yield in rice. Here, we identified a recessive mutant gene, grain length and awn 1 (gla1), which caused a significant increase in grain length and weight, and was associated with long awns. The gla1 mutation was mapped to a single-nucleotide polymorphism in a gene encoding a cytoplasmically-localized mitogen-activated protein kinase (MAPK) phosphatase. Overexpression of GLA1 caused a decrease in grain length, and the GLA1 protein interacted with OsMAPK6. These results suggest that GLA1 may serve as a negative regulator of the OsMAPKK4-OsMAPK6 cascade, controlling grain size via the dephosphorylation of OsMAPK6.