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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (7): 1745-1757.doi: 10.16420/j.issn.0513-353x.2024-0723

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

Functional Analysis of StHY5 Associated with Low-Temperature Stress in Potato

DOU Xueting1, ZHU Xi2,3, ZHANG Ning1,*(), and SI Huaijun1   

  1. 1 State Key Laboratory of Aridland Crop Science,College of Life Science and Technology,Gansu Agricultural University,Lanzhou 730070,China
    2 Key Laboratory of Tropical Fruit Biology,Ministry of Agriculture and Rural Affairs/Hainan Provincial Key Laboratory of Tropical Horticulture Postharvest Treatment and Preservation,Institute of South Subtropical Crops,Chinese Academy of Tropical Agricultural Sciences,Zhanjiang,Guangdong 524091,China
    3 National Key Laboratory of Biological Breeding of Tropical Crops,Sanya Research Institute,Chinese Academy of Tropical Agricultural Sciences,Sanya,Hainan 572024,China
  • Received:2024-11-12 Revised:2025-04-22 Online:2025-07-23 Published:2025-07-23
  • Contact: ZHANG Ning

Abstract:

HY5 is a class of bZIP transcription factor. HY5 is involved in regulating plant light response and abiotic stress. In this study,the functions of the StHY5 and its encoded protein were analyzed,and the subcellular localization was observed using potato cultivar‘Atlantic’as the experimental material. The expression pattern of StHY5 gene was analyzed under 4 ℃ low-temperature stress by qRT-PCR method. The overexpression and interference expression vectors of StHY5 gene were constructed,and obtained transgenic potato plants through genetic transformation technology. The changes of reactive oxygen species under 4 ℃ low-temperature treatment. The results showed that the coding sequence of StHY5 gene was 477 bp,encoding 158 amino acids. StHY5 protein was located in the nucleus,and it belonged to unstable hydrophilic proteins,without signal peptide and transmembrane structure. It had conserved evolutionary among different species,and had the highest evolutionary relationship with wild tomato and Solanum stenotomum. StHY5 protein was closely related to 10 proteins interaction,including 1 photosensitive pigment A,2 B-box proteins,and 3 histone deacetylases. There were cis-acting elements involved in light-responsive and hormone-responsive in the promoter region of StHY5 gene. The qRT-PCR results showed that StHY5 gene was consistently up-regulated in expression during low-temperature. The superoxide dismutase(SOD),peroxidase(POD),catalase(CAT)activities and proline(Pro)content of StHY5 gene overexpression plants were significantly higher and the malondialdehyde(MDA)content was significantly lower than wild type plants under low-temperature treatment. However,StHY5 gene interference expression plants was reversed under low-temperature treatment.

Key words: potato, StHY5, low temperature, bioinformatics analysis, genetic transformation