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Acta Horticulturae Sinica ›› 2025, Vol. 52 ›› Issue (10): 2625-2641.doi: 10.16420/j.issn.0513-353x.2024-0833

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

Construction of Yeast Library and Identification of the BrrCDPK Gene Family of PSY Potential Interacting Proteins in Turnip

BIAN Shuanling1, DENG Changrong1, FAN Luze2, WU Yanxun1, REN Yanjing1,3,*()   

  1. 1 Qinghai University,Institute of Horticulture,Qinghai Academy of Agricultural and Forestry Sciences,Xining 810016,China
    2 College of Agriculture and Animal Husbandry,Qinghai University,Xining 810016,Chian
    3 Key Laboratory of Germplasm Resources Protection and Genetic Improvement of Tibetan Plateau,Ministry of Agriculture and Rural Affairs,Xining 810016,China
  • Received:2025-03-18 Revised:2025-06-16 Online:2025-10-25 Published:2025-10-28
  • Contact: REN Yanjing

Abstract:

Different tissues of yellow turnip W25 and white turnip W21 were used as plant materials to construct cDNA yeast library of turnip,whose library capacity was 1.5 × 107 CFU and average length of insert frangment was greater than 1 000 bp. A total of 18 positive interacting proteins were obtained by hybridizing the constructed bait vector pGBKT7-PSY with the cDNA library. Then,a robust interaction between the candidate protein CDPK8 and PSY was confirmed by rigorous yeast two-hybrid and bimolecular fluorescence complementation(BiFC)experiments. The interacting protein CDPK was selected for gene family analysis,and a total of 50 CDPK genes(named BrrCDPK1-BrrCDPK50)members with STKc_CAMK protein kinase and 2 domains of EF-hand were identified. Structural analysis revealed that the number of amino acids encoded by CDPK genes ranged from 411 to 660,with an averagetheoretical pI of 8.79. No number and structural differences of conserved motifs among each CDPK proteins were found,and all proteins contained motif 1,motif 2,motif 3 and motif 6. Chromosome location showed that the distribution of BrrCDPKs on each chromosome was nonrandom. Phylogenetic analysis revealed that BrrCDPKs and AtCDPKs were clustered into different groups,indicating that CDPK gene duplication during evolution existed some species specificity. Gene expression profiling identified that 14 CDPK genes were highly expressed in yellow turnips than that in white turnip.

Key words: Brassica rapa ssp. rapifera, carotenoid, yeast two-hybrid, interactive protein, calcium-dependent protein kinase(CDPK), gene family identification