J Integr Plant Biol. ›› 2019, Vol. 61 ›› Issue (10): 1036-1042.DOI: 10.1111/jipb.12736

Special Issue: Crop yield

• Letter to the Editor • Previous Articles     Next Articles

GRAIN LENGTH AND AWN 1 negatively regulates grain size in rice

Tao Wang1,2†, Ting Zou1,2,3†, Zhiyuan He1,2, Guoqiang Yuan1,2, Tao Luo1,2, Jun Zhu1,2, Yueyang Liang1,2, Qiming Deng1,2, Shiquan Wang1,2, Aiping Zheng1,2, Huainian Liu1,2, Lingxia Wang1,2, Ping Li1,2,4* and Shuangcheng Li1,2,4*   

  1. 1State Key Laboratory of Hybrid Rice, Sichuan Agricultural University, Chengdu 611130, China
    2Rice Research Institute, Sichuan Agricultural University, 211 Huimin Road, Wenjiang 611130, China
    3Rice Research Institute, Southwest University of Science and Technology, Mianyang 621010, China
    4State Key Laboratory of Hybrid Rice, Hunan Hybrid Rice Research Center, Changsha 410125, China

    These authors contributed equally to this work.
    Email: Ping Li (liping6575@163.com); Shuangcheng Li (lisc926105@163.com, Dr. Li is fully responsible for the distribution of all materials associated with this article)
  • Received:2018-08-09 Accepted:2018-11-06 Online:2018-11-10 Published:2019-10-01

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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