COG2 Negatively Regulates Chilling Tolerance Through Cell Wall Components Altered in Rice

Overview

Journal Theor Appl Genet

Publisher Springer

Specialty Genetics

Date 2023 Jan 21

PMID 36680595

Authors

Jinglei Feng

Zhitao Li

Wei Luo

Guohua Liang

Yunyuan Xu

Kang Chong

Affiliations

Soon will be listed here.

Abstract

Chilling-tolerant QTL gene COG2 encoded an extensin and repressed chilling tolerance by affecting the compositions of cell wall. Rice as a major crop is susceptible to chilling stress. Chilling tolerance is a complex trait controlled by multiple quantitative trait loci (QTLs). Here, we identify a QTL gene, COG2, that negatively regulates cold tolerance at seedling stage in rice. COG2 overexpression transgenic plants are sensitive to cold, whereas knockout transgenic lines enhance chilling tolerance. Natural variation analysis shows that Hap1 is a specific haplotype in japonica/Geng rice and correlates with chilling tolerance. The SNP1 in COG2 promoter is a specific divergency and leads to the difference in the expression level of COG2 between japonica/Geng and indica/Xian cultivars. COG2 encodes a cell wall-localized extensin and affects the compositions of cell wall, including pectin and cellulose, to defense the chilling stress. The results extend the understanding of the adaptation to the environment and provide an editing target for molecular design breeding of cold tolerance in rice.

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