The Genetic Mechanism of Resistance to Powdery Mildew in Cucumber

ACTA HORTICULTURAE SINICA ›› 2005, Vol. 32 ›› Issue (5): 899-901.

• 研究报告 • Previous Articles Next Articles

The Genetic Mechanism of Resistance to Powdery Mildew in Cucumber

Zhang Suqin1, 2;Gu Xingfang2;Zhang Shengping2;Zou Zhirong1

(¹College of Horticulture, Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, China; ² Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, Beijing 100081, China)

Received:2004-12-08 Revised:2005-04-13 Online:2005-10-25 Published:2005-10-25

Abstract

Abstract: The cucumber powdery mildew resistance was studied with joint analysis of multip le generations. The best fitted model of three resistant suscep tible crosses was two major genes plus polygenes mixed inheritance model ( E2120 model) without excep tion. In cross I, heritabilities ofmajor geneswere 64.26% -95.47%. Formajor genes, susceptibilitywas the dominant partly. The additive effects of the two major genes and the dominant effect of the second major gene were higher. The ep istatic effect of additive ×dominant of two major genes was higher too. The heritabilities ofmajor genes in the crossⅡ and cross Ⅲ were 96.04% and 95.35% , respectively. The additive effect, dominant effect and dominance degree of two major genes were similar in this two crosses.

Key words: Cucumber, Powdery mildew, Resistance, Inheritance

CLC Number:

S 642.2

Zhang Suqin;;Gu Xingfang;Zhang Shengping;Zou Zhirong. The Genetic Mechanism of Resistance to Powdery Mildew in Cucumber[J]. ACTA HORTICULTURAE SINICA, 2005, 32(5): 899-901.

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The Genetic Mechanism of Resistance to Powdery Mildew in Cucumber

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