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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic differentiation of watermelon landrace types in Mali revealed by microsatellite (SSR) markers
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Genetic differentiation of watermelon landrace types in Mali revealed by microsatellite (SSR) markers

机译：微卫星（SSR）标记揭示马里西瓜地方品种的遗传分化

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This study describes the genetic differentiation of a collection of 134 watermelon landrace accessions from Mali, representing red fleshed dessert and white fleshed seed and cooking type watermelons from five regions, plus three commercial dessert type cultivars with red flesh. The material was represented by in total 397 plants and was analysed using 24 microsatellite primer sets, which differentiated 129 alleles across all loci. Analyses of molecular variance ascribed 51 % of the variation among the landrace accessions, and 14 % of the variation could be ascribed to the regions. Partitioning the accessions into use groups (dessert, cooking, seed processing) explained 25 % of the variation. When categorising the accessions further into 10 landrace types, differentiated on the basis of use groups, local accession name, flesh colour and seed phenotype, these landrace types explained 26 % of the variation. Analysis with the software Structure revealed that the accessions with confidence could be separated into two major genetic groups, related to flesh colour (red and white) of the watermelon fruits. The same analysis further indicated that the material may be differentiated into eight genetic sub-groups. One group included again the red fleshed dessert types with local and commercial origin, while the remaining seven genetic sub-groups comprised the white fleshed landrace types used for seed processing and cooking, as well as white fleshed types of one dessert type. Some of the seed and cooking types were to a large extent different and assigned to one genetic sub-group each. A Mantel test, based on geographical and genetic distance matrices showed a positive correlation, indicating that seed exchange has not overcome local adaptation.
机译：这项研究描述了来自马里的134种西瓜地方品种的遗传分化，这些品种代表来自五个地区的红色果肉和白色果肉种子和烹饪型西瓜，以及三个带有红色果肉的商业甜点型品种。该材料以总共397株植物为代表，并使用24个微卫星引物组进行了分析，该引物组在所有基因座上区分了129个等位基因。分子变异的分析归因于地方种质中51％的变异，而14％的变异可归因于这些区域。将种质分为使用组（甜点，烹饪，种子加工）可解释25％的变化。将这些种进一步分类为10个地方品种类型时，根据用途组，本地种名，果肉颜色和种子表型进行了区分，这些地方品种类型解释了26％的变异。使用软件结构进行的分析表明，可以将置信度较高的种质分为两个主要的遗传组，它们与西瓜果实的肤色（红色和白色）有关。相同的分析进一步表明，该材料可分为八个遗传亚组。一组再次包括具有本地和商业来源的红色果肉甜点类型，而其余七个遗传亚组包括用于种子加工和烹饪的白色果肉地方品种类型，以及一种甜点类型的白色果肉类型。一些种子和蒸煮类型在很大程度上不同，并且每个都归为一个遗传亚组。基于地理和遗传距离矩阵的Mantel测试显示出正相关，表明种子交换尚未克服局部适应性。

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