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首页> 外文期刊>Genetic Resources and Crop Evolution >Classification of elite cassava varieties (Manihot esculenta Crantz) cultivated in Benin Republic using farmers' knowledge, morphological traits and simple sequence repeat (SSR) markers
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Classification of elite cassava varieties (Manihot esculenta Crantz) cultivated in Benin Republic using farmers' knowledge, morphological traits and simple sequence repeat (SSR) markers

机译：利用农民知识，形态特征和简单序列重复（SSR）标记，在贝宁共和国培养精英木薯品种（Manihot Esculenta Crantz）的分类

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Cassava (Manihot esculenta Crantz) is an important food security crop or resource for poor rural communities particularly in Africa. The crop's ability to produce high yields even under poor conditions and storability of its roots underground for longer periods or until needed makes it a model 'food security crop'. In Benin Republic, cassava has been recognized as one of the major crop contributing towards dynamic value chains generating incomes for small-holder farmers. The crop is grown all over the country, however, the increased production are mainly recorded from far south and central parts of the country. Genetic improvement of cassava in Benin Republic is limited because of poor knowledge of genetic diversity present within the country. The main objective of this study was to assess the genetic diversity and relationships among elite cassava varieties collected from different regions of Benin using fluorescently labelled simple sequence repeat (SSR) markers and to compare the results with farmer's knowledge and morphological traits. A total of 96 cultivars collected from major cassava growing areas such as Southern and Central Benin were classified into 24 different groups using farmers' knowledge, while classification based on 18 morphological traits resulted in five groups. In total, sixteen SSR markers were tested for molecular analysis of the ninety-six cassava varieties. Among the sixteen, twelve SSR markers gave good banding pattern and were used to genotype the varieties. An average of 3.58 and 0.47 for number of alleles and polymorphism information content respectively was observed. The observed heterozygosity (H-o) ranged from 0.23 to 1.0 with an average of 0.66 indicating moderate level of diversity among the cultivars. Based on the proportion of shared alleles and hierarchical clustering, the 96 elite cassava varieties were classified as 74 unique varieties. Principal component analysis and analysis of molecular variance revealed no significant variation between the regions thus, explaining regular exchange of planting materials among cassava farmers across various regions. The moderate level of genetic diversity in famer's field, revealed in the present study, is a good indication of the need for broadening the genetic base of cassava in Benin Republic and establishing a formal breeding program in the country.
机译：木薯（Manihot Esculenta Crantz）是一个重要的粮食安全作物，特别是在非洲贫困农村社区的资源。即使在较长的时间内或直到所需的情况下，甚至在地下的差的条件和可储存性下，作物也能够在其根的情况下产生高收益率的能力，这使其成为模型“食品安全作物”。在贝宁共和国，木薯被认为是有助于动态价值链的主要作物之一，为小持有人农民产生收入。该作物在全国各地种植，然而，产量增加主要从该国的南部和中部地区记录。由于国内遗传多样性知识差，贝宁共和国木薯的遗传改善是有限的。本研究的主要目的是评估由荧光标记的简单序列重复（SSR）标记的BenIn不同地区收集的Elite Cassava品种之间的遗传多样性和关系，并将结果与​​农民的知识和形态特征进行比较。共有96种从南部和中央贝宁等主要的木薯生长区域收集的品种，使用农民的知识分为24种不同的群体，而基于18次形态特征的分类导致五组。总共有九十六个木薯品种的分子分析测试了16个SSR标记。在十六个中，十二个SSR标记产生了良好的条纹模式，并用于基因型品种。分别平均为3.58和0.47分别被观察到的等位基因和多态性信息含量。所观察到的杂合性（H-O）的范围为0.23-1.0，平均值为0.66，表明品种之间的中等多样性。基于共享等位基因和分层聚类的比例，96个精英木薯品种被归类为74个独特的品种。主要成分分析和分子方差分析显示，该地区之间没有显着的变化，从而解释了各地区的木薯农民中种植材料的正常交换。本研究中揭示了名人领域中度遗传多样性的遗传多样性，是展现在贝宁共和国拓展木薯遗传基础并在该国建立正式育种计划的良好迹象。

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