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5 results for “Oryza nivara”
SNP data for F2 population derived from Oryza rufipogon and O. nivara
<p>To elucidate the genetic architecture underlying phenotypic divergence is essential to the understanding of ecological adaptation and speciation. Two wild rice species (<em>O. rufipogon</em> and <em>O. nivara</em>) are a progenitor-daughter species pair with ecological divergence and provide a unique system for studying ecological adaptation/speciation. Here, we constructed a high-resolved linkage map and conducted a quantitative trait locus (QTL) analysis of 19 phenotypic traits using an F<sub>2</sub> population generated from a cross between the perennial <em>O. rufipogon</em> and annual <em>O. nivara</em>. We identified 113 QTLs associated with interspecific divergence of 16 quantitative traits, with effect sizes ranging from 1.61% to 34.1% in terms of the percentage of variation explained (PVE). The distribution of effect sizes of QTLs followed a negative exponential, suggesting that a few genes of large effect and many genes of small effect were responsible for the phenotypic divergence. We observed 18 clusters of QTLs (QTL hotspots), with each involving multiple adaptive traits, demonstrating the importance of coinheritance of loci/genes in ecological adaptation/speciation. Analysis of effect direction and <em>v</em>-test statistics revealed that interspecific differentiation of most traits was driven by divergent natural selection, supporting the argument that ecological adaptation/speciation would proceed rapidly under coordinated selection on multiple traits.</p>
Study on the mating systems of wild rice Oryza rufipogon and O. nivara and their effects on population genetic variation
<p>As the wild ancestors of Asian cultivated rice,<em> Oryza rufipogon</em> Griff. and <em>O. nivara</em> Sharma et Shastry serve as valuable germplasms for rice breeding. Mating systems are important in shaping the level and pattern of population genetic variation, and are crucial for germplasm conservation. We genotyped 12 simple sequence repeats (SSR) markers for a large number of maternal plants and seeds collected from <em>O</em>.<em> rufipogon</em> and <em>O. nivara</em> populations distributed in Southeast Aisa and South China. Based on the 12 SSR markers, we estimated the outcrossing rates and other parameters of the mixed-mating model for the two wild rice species. We also assessed the level of genetic diversity and population structure for parental populations of <em>O</em>.<em> rufipogon</em> and <em>O. nivara</em>. Our study could facilitate <em>in situ</em> and <em>ex situ</em> conservation, and the utilization of these valuable germplasm resources.</p>
SNP data for F2 population derived from Oryza rufipogon and O. nivara
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Study on the mating systems of wild rice Oryza rufipogon and O. nivara and their effects on population genetic variation
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Data from: Population genetic structure of Oryza rufipogon and O. nivara: implications for the origin of O. nivara
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