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首页> 美国卫生研究院文献>Annales de G n ;tique et de S lection Animale >Diversité génétique et dynamique des formes adventices de riz de camargue
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Diversité génétique et dynamique des formes adventices de riz de camargue

机译：不定型大米的遗传和动态多样性

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Weedy rice have long been known, particularly in tropical areas, as the result of introgressions between wild and cultivated forms. More recently, rice fields have been frequently invaded by new weedy forms in temperate regions where wild forms were never reported. These plants show many traits similar to true wild O. rufipogon (shattering, dormancy, awning, organ pigmentation). Their occurrence concerns many parts of the world practicing intensive rice-growing with direct seeding. Samples of weeds from Camargue have been analyzed with 15 microsatellite markers in comparison to a representative collection of 145 Asian rice varieties. Diversity of weedy rice is in agreement with the genetic structure of O. sativa mainly organized in two main groups of varieties, indica and japonica. Weeds from Camargue showed a greater diversity than Mediterranean varieties (temperate japonica) as well as the presence of original alleles or alleles more typical of indica varieties. Genetic structure of weed stands appeared more probably the consequence of a predominantly autonomous dynamics allowed by seed conservation and dissemination than the result of gene flow with varieties from which they are isolated by a much greater precocity. These results suggested that distant crosses between indica and japonica varieties and their effect on genome structure and expression could be a relevant explanation to this “weediness” process.
机译：由于野生型和栽培型之间的互渗，杂草稻早就广为人知，特别是在热带地区。最近，在从未报道过野生形式的温带地区，稻田经常被新的杂草形式入侵。这些植物显示出许多与真正的野生红景天相似的特性（破碎，休眠，遮篷，器官色素沉着）。它们的发生与世界许多地方的直接播种稻米集约化有关。与代表的145个亚洲水稻品种相比，使用15种微卫星标记对来自Camargue的杂草样品进行了分析。杂草稻的多样性与稻的遗传结构相符，稻的稻稻的遗传结构主要分为两大类，即d稻和粳稻。来自Camargue的杂草显示出比地中海变种（温带粳稻）更大的多样性，以及原始等位基因或more型更典型的等位基因的存在。杂草林的遗传结构似乎更可能是种子保存和传播所允许的主要自主动力的结果，而不是基因流与通过更早熟将其分离出来的变种所产生的结果。这些结果表明，in稻和粳稻品种之间的远缘杂交及其对基因组结构和表达的影响可能是这种“杂草”过程的相关解释。

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