A Rice Diversity Panel Evaluated for Genetic and Agro-Morphological Diversity between Subpopulations and its Geographic Distribution
A Rice Diversity Panel Evaluated for Genetic and Agro-Morphological Diversity between Subpopulations and its Geographic Distribution
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DOI：
10.2135/cropsci2010.11.0641
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发表时间：
2011-09-01
期刊：
影响因子：
2.3
通讯作者：
Eizenga, Georgia C.
中科院分区：
文献类型：
--
作者：
Ali, M. Liakat;McClung, Anna M.;Eizenga, Georgia C.
对409份亚洲稻（Oryza sativa L.）利用36个SSR标记对来自79个国家的100份大豆种质资源进行了指纹分析，并对18个农艺性状进行了评价。遗传上，加入聚成5个祖先组（亚群），籼稻，澳大利亚，芳香族（组V），热带粳稻，温带粳稻，基于模型的结构分析。来自任何单一组的血统低于60%的33个加入物被鉴定为混合物。典型判别分析确定了8个农业形态性状（单株穗数、穗长、株高、剑叶宽、粒长、粒宽、长宽比和体积）为水稻种质间和亚群体间的主要判别性状。基于SSR等位基因和表型性状的分析均表明，粳稻与籼稻的亲缘关系较近，温带粳稻与热带粳稻的亲缘关系也较近。香米（第V组）代表了一个独特的小群体，根据SSR等位基因与热带粳稻更密切相关，但根据表型与Aus和Indica更密切相关。观察到亚群和地理分布之间有很强的关系。该水稻多样性面板与伴随的遗传和表型信息提供了一个有价值的基础关联映射，了解亚群内和亚群之间的基因型和表型差异的基础，和水稻改良计划。
A diverse collection of 409 Asian rice (Oryza sativa L.) accessions originating from 79 countries was fingerprinted with 36 simple sequence repeat (SSR) markers and evaluated for 18 agro-morphological traits. Genetically, the accessions clustered into five ancestral groups (subpopulations), indica, aus, aromatic (Group V), tropical japonica, and temperate japonica, based on model-based structure analysis. Thirty-three accessions with less than 60% ancestry from any single group were identified as admixtures. Canonical discriminant analysis identified eight agro-morphological traits (panicle number per plant, panicle length, plant height, flag leaf width, grain length, width, length: width ratio, and volume) as the main discriminatory characters among the rice accessions and between the subpopulations. Both SSR allele- and phenotypic trait-based analyses indicated a close relationship between aus and indica and similarly between temperate japonica and tropical japonica. The aromatic (Group V) rice represents a distinct small group that is more closely related to tropical japonica based on SSR alleles but to aus and indica based on phenotype. A strong relationship between subpopulations and geographical distribution was observed. This rice diversity panel with the accompanying genetic and phenotypic information provides a valuable foundation for association mapping, understanding the basis of both genotypic and phenotypic differences within and between subpopulations, and rice improvement programs.