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首页> 外文期刊>Plant Genetic Resources Characterization and Utilization >Genetic variation in lowland sorghum (Sorghum bicolor (L.) Moench) landraces assessed by simple sequence repeats
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Genetic variation in lowland sorghum (Sorghum bicolor (L.) Moench) landraces assessed by simple sequence repeats

机译：通过简单的序列重复评估低地高粱（高粱双色（L.）Moench）的地方品种的遗传变异

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The regions of north-eastern Ethiopia are known for their high levels of sorghum genetic diversity, and for being drought prone. For centuries, sorghum has been developed and maintained by farmers for its adaptation to the marginal and heterogeneous environment of these regions. The objective of this study was to examine the genetic diversity and population structure of 200 sorghum landraces collected from seven lowland districts, using 30 microsatellite markers sampled from all linkage groups of the sorghum genome. Both distance-based and model-based analytical approaches were used to analyse the data. The data analysis revealed that there was a large variation among all the markers under study. The values of polymorphic information content ranged from 0.26 to 0.88, with a mean value of 0.61, reflecting the high discriminating ability of the markers studied. The mean value of total gene diversity was 0.69, which partitioned 86% among the landraces and 14% within the landraces. Gene diversity among the landraces was largely due to the variation among the genotypes within the geographic origins. Landraces sampled from different collection sites appeared to cluster together, indicating the existence of a high level of gene flow among the sites of collection. This indicates that a relatively small, random collection of landraces would capture the bulk of genetic diversity in the target area. A moderately high level of genetic differentiation and a relatively low level of gene flow were observed between sorghum races and maturity groups. Given that the target area is marginal, drought prone and heterogeneous, the study of genetic diversity among sorghum landraces could serve as an important indicator of valuable alleles for drought tolerance in future sorghum improvement programmes.
机译：埃塞俄比亚东北部地区以高粱遗传多样性高和干旱易发着称。几个世纪以来，农民一直在开发和维护高粱，以适应这些地区的边缘和异质环境。这项研究的目的是使用从高粱基因组所有连锁组中采集的30个微卫星标记，检查从七个低地地区收集的200个高粱地方品种的遗传多样性和种群结构。基于距离的分析方法和基于模型的分析方法均用于分析数据。数据分析表明，所研究的所有标记之间存在很大差异。多态信息含量的值在0.26至0.88的范围内，平均值为0.61，反映了所研究标记的高识别能力。总基因多样性的平均值为0.69，在地方品种中占86％，在地方品种中占14％。地方物种之间的基因多样性主要是由于地理起源内基因型之间的差异。从不同收集地点采样的地方品种似乎聚集在一起，表明收集地点之间存在高水平的基因流动。这表明相对较小的随机收集的地方品种将捕获目标地区的大部分遗传多样性。在高粱种族和成熟群体之间观察到中等程度的遗传分化和相对较低水平的基因流动。鉴于目标区域是边缘地区，容易干旱且异质的，研究高粱地方品种之间的遗传多样性可以作为重要的等位基因的重要指标，可用于未来的高粱改良计划。

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