苹果种间杂种对苹果腐烂病感病性的遗传分析

Inheritance of susceptibility to valsa canker in Malus interspecific hybrids

【目的】为分析苹果实生树对苹果腐烂病抗病性的遗传规律,【方法】2010—2011年连续2 a用2个苹果腐烂病菌株对‘紫塞明珠’ב富士’的杂种实生树1 150株进行离体接种鉴定,采用次数分布分析法研究了苹果腐烂病抗病性遗传。【结果】结果表明,连续2 a接种2菌株主基因遗传率均在78.5%～85.5%。该实生群体对菌株03-8的感病性的变异由5个主基因位点分离所致,而对菌株xc56的感病性分离与4个主基因位点有关,且年份间表现稳定。【结论】离体枝条接种病原后,发病/不发病表现为质量性状遗传,发病对不发病为显性。感病的实生树接种后发病的病斑长度表现为多基因数量性状遗传。

[ seedlings Objective]To study the inheritance of Valsa canker resistance. [Method] 1 150 apple hybrid asiatica ‘Zisai Pear＇ ×M. domestica ＇Fuji＇） were inoculated with the germinated conidia suspension of two pathogenic strains [Valsa mall Miyabe et Yamada] on excised twigs for two years （2010 and 2011）. Inoculation results were analyzed using frequency distribution analysis. [Result]The joined heritability of these major genes was estimated to be 78.5% to 85.5% in this hybrid group when inoculated by the two strains in the year of 2010 and 2011 respectively. The variation in susceptibility to the strain 03-8 of this hybrid seedlings group was attributed to the segregation of 5 major alleles genes, whereas the susceptibility variation to the strain xc56 within this population was attributed to the segregation of 4 major alleles genes. The regularity of resistance within the adopted population to both of the two strains was respectively stable during two years. [Conclusion]The incidence and non-incidence were qualitatively segregated, and incidence was dominant to non-incidence. The lesion length of diseased seedlings was a quantitative trait.