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首页> 外文期刊>Genetic Resources and Crop Evolution >Genetic diversity of taro (Colocasia esculenta (L.) Schott) in Vanuatu (Oceania): an appraisal of the distribution of allelic diversity (DAD) with SSR markers
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Genetic diversity of taro (Colocasia esculenta (L.) Schott) in Vanuatu (Oceania): an appraisal of the distribution of allelic diversity (DAD) with SSR markers

机译：瓦努阿图（大洋洲）芋头（Colocasia esculenta（L.）Schott）的遗传多样性：利用SSR标记评估等位基因多样性（DAD）的分布

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摘要

In Vanuatu, an oceanic archipelago located in south-west Pacific, taro (Colocasia esculenta (L.) Schott) is one of the staple crops. An eco-geographical survey of its genetic resources was conducted in ten villages, each located on a different island. A sample of 344 landraces referred as the National Sample (NS) was collected. Its genetic diversity was assessed using nine microsatellites markers and then was compared with an International Core Sample (ICS) that was previously distributed in the ten villages of the study in order to test the geographical distribution of allelic diversity as an effective mean for the on-farm conservation of root crops. The ICS was composed of 41 accessions, including 23 originating from South-East Asia. The molecular dataset revealed in the NS (1) 324 distinct multilocus genotypes, (2) six genetic clusters mainly differentiated by rare alleles, (3) a geographical structure of the genetic resources of taro based, within each village, on the dominance of one or two of these clusters rather that their exclusivity, and (4) an analogy between the patterns of dominant clusters between villages and the past and present social networks. In addition, accessions from the ICS revealed 52 new alleles. Based on these findings, we formulate hypotheses regarding the processes involved in the genetic diversification of taro in Vanuatu. We also discuss the use of this set of microsatellite markers along with the molecular dataset obtained from this study as effective tools to monitor the diversity and evolution of taro in the future.
机译：在西南太平洋的海洋群岛瓦努阿图，芋头（Colocasia esculenta（L.）Schott）是主要农作物之一。在十个村庄中进行了对其遗传资源的生态地理调查，每个村庄都位于不同的岛上。收集了344个地方品种的样品，称为国家样品（NS）。使用9个微卫星标记评估了其遗传多样性，然后与先前在研究的10个村庄中分发的国际核心样本（ICS）进行了比较，以测试等位基因多样性的地理分布，以此作为开展活动的有效手段。农场保护根茎作物。 ICS由41个种质组成，其中23种来自东南亚。 NS中揭示的分子数据集（1）324个不同的多基因座基因型，（2）主要由稀有等位基因区分的六个遗传簇，（3）每个村庄内基于一个优势的芋头遗传资源的地理结构或其中两个集群，而不是它们的排他性；和（4）在村庄与过去和现在的社会网络之间的主导集群模式之间进行类比。此外，ICS的入种揭示了52个新等位基因。基于这些发现，我们就瓦努阿图芋头的遗传多样化所涉及的过程提出了假设。我们还将讨论使用这套微卫星标记以及从本研究中获得的分子数据集，作为将来监控芋头多样性和进化的有效工具。

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