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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (3): 655-670.doi: 10.16420/j.issn.0513-353x.2024-0378

• Genetic & Breeding·Germplasm Resources·Molecular Biology • Previous Articles     Next Articles

Response of Ubiquitin-ligase Gene CsPUB21 to Different Abiotic Stress in Camellia sinensis

DENG Shuqin, GAO Yingrui, LI Yutong, WANG Ying, GONG Chunmei, BAI Juan*()   

  1. College of Horticulture,Northwest A & F University,Yangling,Shaanxi 712100,China
  • Received:2024-07-09 Revised:2025-01-12 Online:2025-03-25 Published:2025-03-25
  • Contact: BAI Juan

Abstract:

The U-box ubiquitin E3 ligase gene CsPUB21 were cloned and functionally analyzed in Camellia sinensis‘Shaancha 1’. The length of the coding sequence of CsPUB21 is 1 242 bp,encoding a total of 413 amino acids with a conserved U-box domain at the N terminus and an ARM domain at the C terminus. The encoded protein,an unstable hydrophilic protein. The promoter region contains multiple cis-acting elements in response to drought,high salt and low temperature. The subcellular localization results indicated that CsPUB21 is localized on the cell membrane and cytoplasm. Gene expression pattern analysis showed that CsPUB21 was up-regulated by drought and salt stress treatments,and down-regulated by low temperature in different cultivars of C. sinensis. Overexpression of CsPUB21 gene in Arabidopsis significantly enhanced plants resistance to drought and salt stress. The qRT-PCR results showed that the expression level of CsPUB21 was up-regulated after drought and salt stress. Compared with the wild type,overexpression of CsPUB21 in Arabidopsis resulted in higher chlorophyll content and soluble sugar content under drought and salt stress,enhanced activities of antioxidant enzymes SOD,POD,and CAT,and decreased relative conductivity and MDA content. The research results indicated that the CsPUB21 plays a positive regulatory role in tea plant response to drought and salt stress.

Key words: Camellia sinensis, CsPUB21, gene cloning, abiotic stress, expression analysis, heterologous function verification