A mitochondrial pentatricopeptide repeat protein enhances cold tolerance by modulating mitochondrial superoxide in rice

Xiaofeng Zu, Lilan Luo (), Zhen Wang, Jie Gong, Chao Yang, Yong Wang, Chunhui Xu, Xinhua Qiao, Xian Deng, Xianwei Song, Chang Chen, Bao-Cai Tan and Xiaofeng Cao ()
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Xiaofeng Zu: Chinese Academy of Sciences
Lilan Luo: Chinese Academy of Sciences
Zhen Wang: Chinese Academy of Sciences
Jie Gong: Chinese Academy of Sciences
Chao Yang: Chinese Academy of Sciences
Yong Wang: Shandong University
Chunhui Xu: Shandong University
Xinhua Qiao: Chinese Academy of Sciences
Xian Deng: Chinese Academy of Sciences
Xianwei Song: Chinese Academy of Sciences
Chang Chen: Chinese Academy of Sciences
Bao-Cai Tan: Shandong University
Xiaofeng Cao: Chinese Academy of Sciences

Nature Communications, 2023, vol. 14, issue 1, 1-12

Abstract: Abstract Cold stress affects rice growth and productivity. Defects in the plastid-localized pseudouridine synthase OsPUS1 affect chloroplast ribosome biogenesis, leading to low-temperature albino seedlings and accumulation of reactive oxygen species (ROS). Here, we report an ospus1-1 suppressor, sop10. SOP10 encodes a mitochondria-localized pentatricopeptide repeat protein. Mutations in SOP10 impair intron splicing of the nad4 and nad5 transcripts and decrease RNA editing efficiency of the nad2, nad6, and rps4 transcripts, resulting in deficiencies in mitochondrial complex I, thus decrease ROS generation and rescuing the albino phenotype. Overexpression of different compartment-localized superoxide dismutases (SOD) genes in ospus1-1 reverses the ROS over-accumulation and albino phenotypes to various degrees, with Mn-SOD reversing the best. Mutation of SOP10 in indica rice varieties enhances cold tolerance with lower ROS levels. We find that the mitochondrial superoxide plays a key role in rice cold responses, and identify a mitochondrial superoxide modulating factor, informing efforts to improve rice cold tolerance.

Date: 2023
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DOI: 10.1038/s41467-023-42269-4

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