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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (11): 2133-2145.doi: 10.16420/j.issn.0513-353x.2021-0060

• Original article • Previous Articles     Next Articles

Studies on the Resistance of Apple MdMYB116 to Powdery Mildew

JI Miaomiao1, WAN Ye1, ZHANG Yiping1, MA Hai1, WANG Xiping1,2,*(), GAO Hua1,2,*()   

  1. 1College of Horticulture,State Key Laboratory of Crop Stress Biology in Arid Areas,Northwest A & F University,Yangling,Shaanxi 712100,China
    2Key Laboratory of Horticultural Crop Biology and Germplasm Development in Northwest China,Ministry of Agriculture and Rural Affairs,Yangling,Shaanxi 712100,China
  • Received:2021-05-21 Revised:2021-07-20 Published:2021-12-02
  • Contact: WANG Xiping,GAO Hua E-mail:wangxiping@nwsuaf.edu.cn;gaohua2378@163.com

Abstract:

The full-length cDNA sequence of MdMYB116 was cloned from the powdery mildew resistant‘Gala’apple. The open reading frame of this gene was 900 bp,encoded 299 amino acids and contained two conserved domains. The phylogenetic tree results showed that MdMYB116 shared close relationship with PbMYB108-like in pear,with a identity of 93.38%. Subcellular localization assay evidenced that MdMYB116 was targeted to the nucleus. The expression level of MdMYB116 increased gradually from 6 h to 12 h and it was induced to a peak at 12 h after inoculation with powdery mildew. Yeast transcriptional activation verification revealed that the full length of MdMYB116 exhibited self-activating activity. MdMYB116 was transformed into Arabidopsis thaliana heterologously,and transgenic plant was obtained. After being inoculated with powdery mildew,it was found that the resistance of the transgenic lines was significantly higher than that of the wild type and pad4 mutant plants. Histochemical staining assays displayed that compared with wild type and pad4 mutant plants,the transgenic lines had a higher level of reactive oxygen species(ROS)burst,and more dead cells and calluses accumulation,indicating that the transgenic lines had a serious allergic lethal situation,which proved that MdMYB116 participated in the plants powdery mildew immunomodulatory response. Expression analysis of some disease related genes speculated that MdMYB116 may enhanced defense responses though SA and/or MeJA signal pathways.

Key words: apple, MdMYB116, powdery mildew, functional analysis

CLC Number: