Early selection of bZIP73 facilitated adaptation of japonica rice to cold climates

Citao Liu, Shujun Ou, Bigang Mao, Jiuyou Tang, Wei Wang, Hongru Wang, Shouyun Cao, Michael R. Schläppi, Bingran Zhao, Guoying Xiao, Xiping Wang () and Chengcai Chu ()
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Citao Liu: Chinese Academy of Sciences
Shujun Ou: Chinese Academy of Sciences
Bigang Mao: China National Hybrid Rice Research and Development Center
Jiuyou Tang: Chinese Academy of Sciences
Wei Wang: Chinese Academy of Sciences
Hongru Wang: Chinese Academy of Sciences
Shouyun Cao: Chinese Academy of Sciences
Michael R. Schläppi: Marquette University
Bingran Zhao: China National Hybrid Rice Research and Development Center
Guoying Xiao: Institute of Subtropical Agriculture Chinese Academy of Sciences
Xiping Wang: Beijing Normal University
Chengcai Chu: Chinese Academy of Sciences

Nature Communications, 2018, vol. 9, issue 1, 1-12

Abstract: Abstract Cold stress is a major factor limiting production and geographic distribution of rice (Oryza sativa). Although the growth range of japonica subspecies has expanded northward compared to modern wild rice (O. rufipogon), the molecular basis of the adaptation remains unclear. Here we report bZIP73, a bZIP transcription factor-coding gene with only one functional polymorphism (+511 G>A) between the two subspecies japonica and indica, may have facilitated japonica adaptation to cold climates. We show the japonica version of bZIP73 (bZIP73Jap) interacts with bZIP71 and modulates ABA levels and ROS homeostasis. Evolutionary and population genetic analyses suggest bZIP73 has undergone balancing selection; the bZIP73Jap allele has firstly selected from standing variations in wild rice and likely facilitated cold climate adaptation during initial japonica domestication, while the indica allele bZIP73Ind was subsequently selected for reasons that remain unclear. Our findings reveal early selection of bZIP73Jap may have facilitated climate adaptation of primitive rice germplasms.

Date: 2018
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DOI: 10.1038/s41467-018-05753-w

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