栗疫病菌营养体不亲和性的遗传学
Genetics of vegetative incompatibility in cryphonectria parasitica.
作者信息
Cortesi P, Milgroom MG
机构信息
Istituto di Patologia Vegetale, Universita degli Studi di Milano, Milan, Italy.
出版信息
Appl Environ Microbiol. 1998 Aug;64(8):2988-94. doi: 10.1128/AEM.64.8.2988-2994.1998.
Abstract
Vegetative incompatibility in the chestnut blight fungus, Cryphonectria parasitica, in Europe is controlled by six unlinked vic loci, each with two alleles. Four previously identified vic loci (vic1, vic2, vic3, and vic4) were polymorphic in European vegetative compatibility (vc) types. Two new loci, vic6 and vic7, also were identified among European vc types. In one cross, vic genes segregated independently at five loci, and 194 progeny were assigned to 32 vc types; none of these loci were linked. A total of 64 vc types were identified from all crosses. All 64 genotypes possible from six vic loci, each with two alleles (2(6) = 64), were identified and assigned to vc types. Based on our model, vc types v-c 5 and v-c 10, which had been used in previous genetic studies, differ by only five vic genes. Future studies of vc types in C. parasitica can use knowledge of vic genotypes for analysis of population genetic structure based on vic allele frequencies and to determine the effect of each vic gene on virus transmission between vc types.
摘要
在欧洲，栗疫病菌（Cryphonectria parasitica）的营养体不亲和性由六个不连锁的vic位点控制，每个位点有两个等位基因。四个先前鉴定出的vic位点（vic1、vic2、vic3和vic4）在欧洲营养体亲和性（vc）类型中具有多态性。在欧洲vc类型中还鉴定出了两个新的位点，vic6和vic7。在一次杂交中，vic基因在五个位点上独立分离，194个子代被归为32种vc类型；这些位点均不连锁。从所有杂交组合中总共鉴定出64种vc类型。鉴定出了六个vic位点（每个位点有两个等位基因，2(6) = 64）可能产生的所有64种基因型，并将其归为vc类型。根据我们的模型，先前遗传研究中使用的vc类型v-c 5和v-c 10仅相差五个vic基因。未来对栗疫病菌vc类型的研究可以利用vic基因型的知识，基于vic等位基因频率分析群体遗传结构，并确定每个vic基因对病毒在vc类型间传播的影响。
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