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首页> 外文期刊>Genetic Resources and Crop Evolution >Molecular and cytogenetic characterization of a collection of bahiagrass (Paspalum notatum Flügge) native to Uruguay
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Molecular and cytogenetic characterization of a collection of bahiagrass (Paspalum notatum Flügge) native to Uruguay

机译：乌拉圭原生的Bahiagrass（Paspalum notatumFlügge）的分子和细胞遗传学特征

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摘要

Paspalum notatum is a subtropical grass present throughout America, and one of the main constituents of the natural grasslands in Uruguay. An apomictic autotetraploid (2n = 4x = 40) is the most frequent cytotype. The occurrence of sexual diploids (2n = 2x = 20) has also been reported as well as the occasional presence of apomictic triploids and pentaploids in Argentina. In this study, ISSR (inter simple sequence repeats) molecular markers were used to analyze the genetic variability of 210 P. notatum individuals from a collection from Uruguay. Cytometric analyses and chromosome counts were used to assess the ploidy level of the individuals. All plants from Uruguay analyzed were tetraploid. Intra- and inter-population variability was found both in genomic DNA content and at the genotypic level. Several multilocus genotypes were shared among individuals within populations and among populations over moderate geographical ranges, at the same time, very dissimilar genotypes were found within the same population. Part of the genetic variance among populations can be explained by a broader scale geographic structure which is partly coincident with the traditionally recognized grassland management regions. In spite of the apparently high degree of genetic admixture within populations, groups of related genotypes seem to follow a broader geographical structure in the area under study. These results suggest that an efficient collection strategy for this apomictically reproducing species should include carefully planned intra- and inter-population sampling. A broader scale regional sampling strategy should also be considered although further studies will be required to define genetic structure at this level.
机译：Paspalum notatum是遍布美国的亚热带草，是乌拉圭天然草原的主要成分之一。无融合生殖的四倍体（2n = 4x = 40）是最常见的细胞类型。也已经报道了性二倍体的发生（2n = 2x = 20）以及在阿根廷偶尔出现的无融合生殖三倍体和五倍体。在这项研究中，ISSR（简单序列间重复）分子标记被用于分析来自乌拉圭的210个Notatum个体的遗传变异。细胞计数分析和染色体计数用于评估个体的倍性水平。分析的来自乌拉圭的所有植物均为四倍体。在基因组DNA含量和基因型水平上都发现了种群内和种群间的变异性。人群中的个体以及中等地理范围的人群之间共享几种多基因型基因型，同时，在同一人群中发现了非常不同的基因型。种群间遗传变异的部分原因可以通过更广泛的地理结构来解释，这与传统上公认的草地管理区部分重合。尽管人群中遗传混合的程度很高，但相关基因型的组似乎在研究区域内遵循更广泛的地理结构。这些结果表明，针对这种无融合生殖生殖物种的有效收集策略应包括精心计划的种群内和种群间采样。尽管还需要进一步的研究来确定这一水平的遗传结构，但也应考虑采用更大范围的区域抽样策略。

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  • 来源
    《Genetic Resources and Crop Evolution》 |2012年第8期|p.1823-1832|共10页
  • 作者

    Rafael Reyno; Rafael Narancio; Pablo Speranza; Javier Do Canto; Beatriz López-Carro; Pablo Hernández; Juan Burgueño; Daniel Real; Marco Dalla Rizza;

  • 作者单位

    National Institute of Agricultural Research, INIA Tacuarembó, Route 5, km 386, Tacuarembó, Uruguay;

    National Institute of Agricultural Research, INIA Las Brujas, Route 48, km 10, Canelones, Uruguay;

    Plant Biology Department, School of Agronomy, University of the Republic, Montevideo, Uruguay;

    National Institute of Agricultural Research, INIA Tacuarembó, Route 5, km 386, Tacuarembó, Uruguay;

    Plant Biology Department, School of Agronomy, University of the Republic, Montevideo, Uruguay;

    Colegio de Postgraduados, Campus Montecillo, Km. 36.5 Carr. México-Texcoco, Montecillo, Edo. de México, Mexico;

    National Institute of Agricultural Research, INIA Tacuarembó, Route 5, km 386, Tacuarembó, Uruguay;

    National Institute of Agricultural Research, INIA Las Brujas, Route 48, km 10, Canelones, Uruguay;

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  • 正文语种 eng
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  • 关键词

    Apomixis; Genetic variability; ISSR markers; Paspalum notatum;

    机译：无融合生殖;遗传变异;ISSR标记;Paspalum notatum;

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