Biotechnology Bulletin ›› 2025, Vol. 41 ›› Issue (4): 188-197.doi: 10.13560/j.cnki.biotech.bull.1985.2024-0964

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Screening the Interacting Protein of Abscisic Acid Receptor VvPYL4 and the Gene Expression of the Interacting Protein in Grape

LIU Li(), WANG Hui, GUAN Tian-shu, LI Bai-hong, YU Shu-yi()   

  1. Institute of Plant Protection, Liaoning Academy of Agricultural Sciences, Shenyang 110161
  • Received:2024-09-30 Online:2025-04-26 Published:2025-04-25
  • Contact: YU Shu-yi E-mail:ll2006lx@163.com;crea0115@163.com

Abstract:

Objective The ABA receptors PYRl/PYLs/RCARs play an important role in the ABA signal transduction pathway. The interaction proteins of VvPYL4 were screened by yeast two-hybrid technique to explore signaling pathway of the VvPYL4 responding to Plasmopara viticola infection in grape. Method The cDNA library was constructed using the Beta grape leaves infected with P. viticola. The bait expression vector pGBKT7-VvPYL4 was constructed to facilitate the identification of proteins that interact with VvPYL4 from the cDNA library by yeast two-hybrid technology. The expression patterns of candidate interacting protein genes induced by P. viticola were analyzed using real-time PCR and the interactions of the proteins were verified using bimolecular fluorescence complementation technology. Result The results titer of the cDNA library was 7.16×107 CFU/mL, the recombination rate was 100%, and the average length encoded by the inserted cDNA was around 1 000 bp. The bait expression vector pGBKT7-VvPYL4 was successfully constructed. Result showed that there was no autoactivation activity in the yeast cells. The cDNA library plasmid and bait vector pGBKT7-VvPYL4 were co-transformed into yeast AH109 strain. After several screening, sequencing, BLAST alignment and rotation verification, 53 candidate proteins were obtained, which were involved in signal transduction, plant growth and development, and environmental stress response, respectively. Based on real-time PCR analysis, the expressions of genes encoding four proteins were induced by P. viticola. During a bimolecular fluorescence complementation assay, the robust yellow fluorescence signals were detected in the leaves of T. benthamiana that were co-transformed with the pSPYCE-PP2C24 and pSPYNE-PYL4 expression vectors, suggesting an interaction between the PYL4 and PP2C24 proteins. Conclusion A cDNA library is constructed from grapevine leaves infected with P. viticola, leading to the identification of 53 candidate proteins that interact with VvPYL4. Among these, the genes encoding four proteins are found to respond to stress induced by P. viticola. Furthermore, the interaction between VvPYL4 and the PP2C24 protein is confirmed.

Key words: grape downy mildew, abscisic acid receptor PYL4, screening of cDNA library, yeast two-hybrid system, bimolecular fluorescence complementation, interaction protein, PP2C