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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic diversity in Bambara groundnut (Vigna subterranea (L.) Verdc.) as revealed by phenotypic descriptors and DArT marker analysis
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Genetic diversity in Bambara groundnut (Vigna subterranea (L.) Verdc.) as revealed by phenotypic descriptors and DArT marker analysis

机译：表型描述符和DArT标记分析揭示了班巴拉花生（Vigna subterranea（L.）Verdc。）的遗传多样性

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摘要

Genetic diversity of a Bambara groundnut germplasm representing accessions from 25 African countries, maintained at the International Institute of Tropical Agriculture (IITA; Nigeria) was evaluated based on seed patterns, qualitative characters, quantitative traits and Diversity Arrays Technique (DArT) markers. The study aimed at identifying important descriptors for germplasm conservation, validating the crop’s geographical centre of origin and facilitating the utilization of existing genetic resources. Frequencies and diversity indices of seven types of seed patterns, 12 qualitative and 28 quantitative traits were evaluated for 124 representative accessions and were analyzed by region to elucidate the geographic distribution of descriptor states. In addition, individual plant samples from a subset of 40 landrace accessions were analyzed by assessing 554 DArT markers. Both the phenetic tree constructed from the qualitative and quantitative descriptors and the population structure derived from DArT marker analysis suggested a relatively high genetic diversity among accessions. Higher genetic diversity was observed for the Cameroon/Nigeria region relative to other regions, in agreement with the hypothesis that this region is the centre of origin for Bambara groundnut. Use of an extensive and diverse range of germplasm and an approach that integrated morphological and quantitative descriptors with DNA markers that represent wide genomic coverage offered a powerful way to make inferences about crop germplasm, in support of crop-improvement programs.
机译：根据种子模式，定性特征，数量性状和多样性阵列技术（DArT）标记，评估了国际热带农业研究所（IITA；尼日利亚）维护的代表来自25个非洲国家的登录号的班巴拉花生的种质的遗传多样性。这项研究旨在确定重要的种质保护指标，验证作物的地理起源中心，并促进对现有遗传资源的利用。评估了124种代表性种的7种种子模式，12种定性和28种数量性状的频率和多样性指数，并按区域进行了分析，以阐明描述符状态的地理分布。此外，通过评估554个DArT标记，分析了40个地方品种的子集中的单个植物样品。从定性和定量描述符构建的物候树和从DArT标记分析得出的种群结构都表明，种质之间的遗传多样性相对较高。相对于其他区域，喀麦隆/尼日利亚地区的遗传多样性更高，这一假设与该地区是班巴拉花生的起源中心有关。广泛多样的种质资源的使用以及将形态学和定量描述符与代表广泛基因组覆盖范围的DNA标记相结合的方法，为推断作物种质资源提供了一种有力的方法，以支持作物改良计划。

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