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Acta Horticulturae Sinica ›› 2021, Vol. 48 ›› Issue (2): 265-275.doi: 10.16420/j.issn.0513-353x.2020-0343

• Research Papers • Previous Articles     Next Articles

Cloning and Functional Analysis of the CDS and Promoter of VpPR4b Gene Response to Downy Mildew in Chinese Wild Grape

LIU Bing*, LI Mengyuan*, ZHANG Na, SHANG Boxing, LIU Guotian**(), XU Yan**()   

  1. College of Horticulture,Northwest A & F University,Key Laboratory of Horticultural Plant Biology and Germplasm Innovation in Northwest China,Ministry of Agriculture and Rural Affairs,Yangling,Shaanxi 712100,China
  • Received:2020-10-15 Revised:2021-01-09 Online:2021-02-25 Published:2021-03-09
  • Contact: LIU Guotian,XU Yan E-mail:liuguotian555@163.com;yan.xu@nwsuaf.edu.cn

Abstract:

VpPR4b and VvPR4b were cloned form Vitis piasezkii‘Liuba-8’(resistant to downy mildew)and V. vinifera‘Pinot Noir’(susceptible to downy mildew). Sequence analysis showed that the identity between VpPR4b and VvPR4b nucleotide was 98.61%. The coding region of VpPR4b is 432 bp,which encodes 143 amino acids and contains the BARWIN conserved domain,indicating it is a typical typeⅡPR4 protein. Both VpPR4b and VvPR4b are highly expressed after inoculation with Plasmopara viticola. Subcellular localization analysis indicated that VpPR4b was localized in the membrane. The promoters of VpPR4b and VvPR4b were cloned from‘Liuba-8’and‘Pinot Noir’,respectively. It showed that VpPR4b and VvPR4b promoter sequence similarity is as high as 95.65%,and contains similar cis-acting elements. It has been verified that the transcription factors WRKY40 and WRKY75 can bind the VpPR4b promoter in yeast. This study showed that PR4b may play a role in the resistance to downy mildew in grape.

Key words: grape, downy mildew, PR4b, promoter

CLC Number: