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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (11): 2499-2508.doi: 10.16420/j.issn.0513-353x.2022-0922

• Plant Protection • Previous Articles     Next Articles

The Apple Receptor Like Kinase Gene MdLYK1 Positively Regulates Valsa Canker Resistance

LI Yanyan1, GUO Shoujun2, CAI Minrui1, SUN E1, YU Hongqiang1, JIANG Daji1, ZUO Cunwu1,3,*(), WANG Hai1,*()   

  1. 1 College of Horticulture,Gansu Agricultural University,Lanzhou 730070,China
    2 Gansu Yasheng Industrial(Group) Co.,Ltd. Tiaoshan Agricultural and Industrial Development Branch,Jingtai,Gansu 730400,China
    3 State Key Laboratory of Aridland Crop Science,Lanzhou 730070,China
  • Received:2023-04-23 Revised:2023-08-17 Online:2023-11-25 Published:2023-11-28
  • Contact: ZUO Cunwu, WANG Hai

Abstract:

The effect and potential mechanism of receptor like kinase gene MdLYK1(MD09G1111800)on the resistance to Valsa canker were investigated by bioinformatics analysis,functional verification and expression analysis. The results showed that MdLYK1 was homologous to Arabidopsis receptor kinase gene AtLYK1,with 68.1% amino acid sequence similarity. The transient expression of this gene in‘Yanfu 6’fruit significantly improved the fruit Valsa canker resistance. Three overexpressed cell lines were obtained by introducing them into the suspension cells of Pyrus betulifolia Bunge. After inoculation with Valsa pyri,the growth rate of colonies on all overexpressing cell lines was significantly lower than that of wild-type cells. All overexpression cell lines were significantly less sensitive to Valsa pyri metabolites compared to the wild type. In addition,MdLYK1 overexpression significantly enhanced the up-regulated expression of key genes related to signaling such as pathogen-associated molecular patterns triggered immunity,reactive oxygen species,jasmonic acid and other signal-related key genes were up-regulated in the suspension cells of Pyrus betulifolia Bunge. In conclusion,MdLYK1 positively regulates the resistance to apple and pear Valsa canker,and pathogen-associated molecular pattern-triggered immunity,reactive oxygen species and jasmonic acid signals are involved in the regulation of resistance.

Key words: apple, Valsa canker, receptor-like kinase gene, LysM-RLK, pattern recognition receptor