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Acta Horticulturae Sinica ›› 2023, Vol. 50 ›› Issue (5): 933-946.doi: 10.16420/j.issn.0513-353x.2022-0159

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

Construction of cDNA Library of Apple Rootstock‘Qingzhen 1’Leaf and Screen of MdMLO Genes’ Upstream Regulator

ZHANG Kun, SI Binbin, ZHOU Jun, REN Yufeng, ZHANG Xin, XU Wendi(), WANG Jiawei, QIAO Shuai, WANG Huiran   

  1. Laboratory of Genetic Developmental Biology,School of Biological Science and Engineering,North Minzu University, Yinchuan 750021,China
  • Received:2022-11-04 Revised:2023-01-18 Online:2023-05-25 Published:2023-05-31
  • Contact: XU Wendi E-mail:xuwendi2018@nmu.edu.cn

Abstract:

MLO is a plant specific recessive resistance gene family. It is widely believed that it has a negative regulatory effect on powdery mildew. Many powdery mildew resistance MLO genes have been found in both monocotyledon and dicotyledon. However,there are few studies on the mechanism of upstream regulator of MLO genes. In this study,a cDNA library of apple rootstock‘Qingzhen 1’leaf was constructed with a titer of about 4 × 109 cfu · mL-1,and the recombination rate was 100%. Bioinformatics analysis of apple MLO gene family promoter region showed that there were 38 kinds of cis-acting elements,including hormone,stress defense response as well as growth and development response elements,etc. TCA and TC-rich repeats cis-acting elements were selected as bait sequences and constructed bait vectors named Bait-TCA and Bait-TC for yeast one-hybrid,respectively. The results showed that the Bait-TCA had self-activation and could not be used for screening. Among the Bait-TC obtained 30 sequences,six sequences were involved in plant anti-stress defense response. It suggested that they might be involved in the response of apple to powdery mildew through regulating the expression of MLO genes.

Key words: apple, MLO gene, cDNA library, yeast one-hybrid, cis-acting element

CLC Number: