Genetic variations in ARE1 mediate grain yield by modulating nitrogen utilization in rice

Qing Wang, Jinqiang Nian, Xianzhi Xie, Hong Yu, Jian Zhang, Jiaoteng Bai, Guojun Dong, Jiang Hu, Bo Bai, Lichao Chen, Qingjun Xie, Jian Feng, Xiaolu Yang, Juli Peng, Fan Chen, Qian Qian (), Jiayang Li () and Jianru Zuo ()
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Qing Wang: Chinese Academy of Sciences
Jinqiang Nian: Chinese Academy of Sciences
Xianzhi Xie: Shandong Academy of Agricultural Sciences
Hong Yu: Chinese Academy of Sciences
Jian Zhang: Chinese Academy of Sciences
Jiaoteng Bai: Chinese Academy of Sciences
Guojun Dong: Chinese Academy of Agricultural Sciences
Jiang Hu: Chinese Academy of Agricultural Sciences
Bo Bai: Shandong Academy of Agricultural Sciences
Lichao Chen: Chinese Academy of Sciences
Qingjun Xie: Chinese Academy of Sciences
Jian Feng: Chinese Academy of Sciences
Xiaolu Yang: Chinese Academy of Sciences
Juli Peng: Chinese Academy of Sciences
Fan Chen: University of Chinese Academy of Sciences
Qian Qian: Chinese Academy of Agricultural Sciences
Jiayang Li: Chinese Academy of Sciences
Jianru Zuo: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-10

Abstract: Abstract In crops, nitrogen directly determines productivity and biomass. However, the improvement of nitrogen utilization efficiency (NUE) is still a major challenge in modern agriculture. Here, we report the characterization of are1, a genetic suppressor of a rice fd-gogat mutant defective in nitrogen assimilation. ARE1 is a highly conserved gene, encoding a chloroplast-localized protein. Loss-of-function mutations in ARE1 cause delayed senescence and result in 10–20% grain yield increases, hence enhance NUE under nitrogen-limiting conditions. Analysis of a panel of 2155 rice varieties reveals that 18% indica and 48% aus accessions carry small insertions in the ARE1 promoter, which result in a reduction in ARE1 expression and an increase in grain yield under nitrogen-limiting conditions. We propose that ARE1 is a key mediator of NUE and represents a promising target for breeding high-yield cultivars under nitrogen-limiting condition.

Date: 2018
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DOI: 10.1038/s41467-017-02781-w

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