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GRAIN LENGTH AND AWN 1 negatively regulates grain size in rice
Tao Wang1,2, Ting Zou1,2,3, Zhiyuan He1,2
1State Key Laboratory of Hybrid Rice, Sichuan Agricultural University, Chengdu 611130, China.
Abstract:
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.
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