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首页> 外文期刊>African Journal of Biotechnology >Genetic diversity and population structure of sweet cassava using simple sequence repeat (SSR) molecular markers
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Genetic diversity and population structure of sweet cassava using simple sequence repeat (SSR) molecular markers

机译：简单序列重复（SSR）分子标记对甜木薯的遗传多样性和种群结构

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摘要

The objective of this study was to evaluate the population structure and genetic diversity among 66 sweet cassava (Manihot esculenta?Crantz) traditional accessions collected in Maringa, Parana, Brazil, using microsatellite molecular markers. Population structure was analyzed by means of genetic distances and probabilistic models; allelic frequencies were used in order to assess the genetic diversity indexes (Ht, Ho, PIC, % polymorphism and number of alleles) for each locus studied. All evaluated loci were polymorphic and the average was highly heterozygote. The number of alleles per locus was low, suggesting that restrict genetic base is a consequence of accession exchange and a reduced number of ancestors in the population. The polymorphic information content (PIC) values showed considerable genetic diversity with a mean value of 0.5076 and peak of 0.5707 for locus GA140. The microsatellites markers revealed a wide genetic variability among the traditional accessions evaluated. Moreover, the sweet cassava populations were separated in two groups using two analytical methods (probabilistic and genetic distances). The most divergent accessions were BGM 17, BGM 20, BGM 51 and BGM 95. On the other hand, the most similar accessions were BGM 25, BGM 33, BGM 37, BGM 59 and BGM 214. Hybrid combinations formed by the most divergent combinations, especially between BGM 51 × BGM 296, BGM 95 × BGM 222 and BGM 20 × BGM 12, are the most promising ones for future sweet cassava breeding programs.
机译：这项研究的目的是使用微卫星分子标记评估在巴西巴拉那州马林加采集的66种甜木薯（Manihot esculenta？Crantz）传统种的种群结构和遗传多样性。通过遗传距离和概率模型分析了人口结构;使用等位基因频率来评估每个研究基因座的遗传多样性指数（Ht，Ho，PIC，％多态性和等位基因数量）。所有评估的基因座均为多态性，平均为高度杂合子。每个基因座的等位基因数量很少，这表明遗传基础受到限制是种质交换和种群中祖先数量减少的结果。多态信息含量（PIC）值显示出相当大的遗传多样性，基因座GA140的平均值为0.5076，峰值为0.5707。微卫星标记揭示了所评估的传统登录品之间的广泛遗传变异。此外，使用两种分析方法（概率和遗传距离）将甜木薯种群分为两组。最分歧的种质是BGM 17，BGM 20，BGM 51和BGM95。另一方面，最相似的种质是BGM 25，BGM 33，BGM 37，BGM 59和BGM 214。特别是在BGM 51×BGM 296，BGM 95×BGM 222和BGM 20×BGM 12之间，是未来甜木薯育种计划中最有前途的品种。

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