1. Genome-wide association study identifies variants of GhSAD1 conferring cold tolerance in cotton.
- Author
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Ge, Changwei, Wang, Li, Yang, Yongfei, Liu, Ruihua, Liu, Shaodong, Chen, Jing, Shen, Qian, Ma, Huijuan, Li, Yang, Zhang, Siping, and Pang, Chaoyou
- Subjects
GENOME-wide association studies ,PHYSIOLOGICAL effects of cold temperatures ,ALCOHOL dehydrogenase ,GENETIC overexpression ,ABSCISIC acid ,GENE silencing ,COTTON - Abstract
Cold stress is a major environmental factor affecting plant growth and development. Although some plants have developed resistance to cold stress, the molecular mechanisms underlying this process are poorly understood. Using genome-wide association mapping with 200 cotton accessions collected from different regions, we identified variations in the short chain alcohol dehydrogenase gene, GhSAD1 , that responds to cold stress. Virus-induced gene silencing and overexpression in Arabidopsis revealed that GhSAD1 fulfils important roles in cold stress responses. Ectopic expression of a haploid genotype of GhSAD1 (GhSAD1
HapB ) in Arabidopsis increased cold tolerance. Silencing of GhSAD1HapB resulted in a decrease in abscisic acid (ABA) content. Conversely, overexpression of GhSAD1HapB increased ABA content. GhSAD1HapB regulates cold stress responses in cotton through modulation of C-repeat binding factor activity, which regulates ABA signalling. GhSAD1HapB induces the expression of COLD - REGULATED (COR) genes and increases the amount of metabolites associated with cold stress tolerance. Overexpression of GhSAD1HapB partially complements the phenotype of the Arabidopsis ABA2 mutant, aba2-1. Collectively, these findings increase our understanding of the mechanisms underlying GhSAD1 -mediated cold stress responses in cotton. [ABSTRACT FROM AUTHOR]- Published
- 2022
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