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首页> 外文期刊>Journal of genetics >Genetic variation and population structure in Oryza malampuzhaensis Krish. et Chand. endemic to Western Ghats, South India
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Genetic variation and population structure in Oryza malampuzhaensis Krish. et Chand. endemic to Western Ghats, South India

机译：斑节稻的遗传变异和种群结构。等。印度南部西高止山脉特有

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Oryza malampuzhaensis Krish. et Chand. ($2n = 4x = 48$; Poaceae, Oryza) is endemic to Western Ghats, South India, and shows a highly localized distribution over a small geographical area in this region. This is the most poorly understood taxon in genus Oryza and is often misidentified as O. officinalis owing to their close morphology. We assessed the nature and distribution of genetic variation among 11 populations of O. malampuzhaensis using random amplified polymorphic DNA markers. The analysis revealed low genetic variation in O. malampuzhaensis. Cluster analysis of pairwise genetic distances of populations revealed three distinct clusters and the grouping of populations largely corresponded to their geographical proximity. Restricted gene flow and a geography-dependent differentiation were evident among populations. The altitude-influenced differences in ecological factors among the natural habitats of the populations seem to be the cause of the geography-dependent differentiation. Genetically isolated smaller populations and a narrow genetic base in O. malampuzhaensis point to its vulnerability to genetic drift and genetic depauperation. Thus O. malampuzhaensis appears to be under the threat of extinction and needs to be conserved by use of suitable methods. The present study also identified molecular markers diagnostic for O. malampuzhaensis.
机译：Oryza malampuzhaensis克里希。等。 （20万美元= 4倍= 48美元;禾本科，稻米）是印度南部西高止山脉的特有种，在该地区的一个较小地理区域内显示出高度局部化的分布。这是Oryza属中最难理解的分类单元，由于其紧密的形态，经常被误认为O. officinalis。我们使用随机扩增的多态性DNA标记评估了O. malampuzhaensis的11个种群之间遗传变异的性质和分布。该分析表明，在O. malampuzhaensis中遗传变异低。种群成对遗传距离的聚类分析揭示了三个不同的聚类，并且种群的分组在很大程度上与它们的地理接近度相对应。人群之间明显的基因流受限和地理依赖性的分化。人口自然栖息地之间受海拔高度影响的生态因子差异似乎是地理依赖性分化的原因。 O. malampuzhaensis的遗传上孤立的较小种群和狭窄的遗传基础表明其易受遗传漂移和遗传退化的影响。因此，malampuzhaensis O.似乎已濒临灭绝，需要通过使用适当的方法进行保护。本研究还鉴定了可诊断O. malampuzhaensis的分子标记。

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