Geographic distribution and multilocus organization of isozyme variation of rice (Oryza sativa L.)
Geographic distribution and multilocus organization of isozyme variation of rice (Oryza sativa L.)
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DOI：
10.1007/s001220051494
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发表时间：
2000-08-01
影响因子：
5.4
通讯作者：
Rutger, JN
中科院分区：
文献类型：
--
作者：
Li, Z;Rutger, JN
水稻同工酶变异的遗传组织利用17个多态性同工酶位点对511份世界各地的植物材料进行了分析。与大多数自交系植物相比，该物种的遗传多样性非常高（H=0.36，每个位点4.82个等位基因）。结果表明，供试材料在南亚、中国和东南亚存在3个同工酶多样性中心，可分为3个分化较好的品种群和1个新的未定名品种群，品种群内的变异占总变异的80%。国内变异占总变异的58%，而品种群内的跨区域和跨国家变异仅占总变异的14%和8%。使用对数线性模型的分析表明，显着的非随机协会之间的等位基因在许多未连锁的同工酶位点的组织在一个非层次的模式，和亚种和宏观地理分化更明显的多位点表型频率比在单个位点的等位基因频率。这些结果表明，对多位点基因复合体的选择是保持物种内广泛的同工酶变异和籼粳分化的主要原因。我们的研究结果进一步表明，独立驯化的籼稻和粳稻，双起源的籼稻从中国和南亚（印度），和分化的生态型“爪哇”和“温带粳稻”的粳稻亚种。
Genetic organization of isozyme variation in rice (Oryza sativa L.) was investigated based on 17 polymorphic isozyme loci using a sample of 511 accessions of worldwide origin, The genetic diversity within the species was very high (H=0.36 with 4.82 alleles per locus), as compared with most selfing plant species. Three diversity centers were detected for isozyme variation including South Asia, China and Southeast Asia, The accessions were classified into three well-differentiated cultivar groups corresponding to the indica and japonica subspecies, and a new unnamed group, Variation within the cultivar groups accounted for 80% of the total isozyme variation. Within-country variation accounted for 58% of the total variation while among-region and among-country variation within the cultivar groups accounted for only 14% and 8% of the total variation. Analyses using log-linear models revealed that pronounced non-random associations between and among alleles at many unlinked isozyme loci were organized in a non-hierarchical pattern, and subspecific and macrogeographic differentiation was much more pronounced in multilocus phenotype frequencies than in allelic frequencies at individual loci. These results suggest that selection on multilocus gene complexes was largely responsible for the maintenance of the extensive isozyme variation within the species and the indica-japonica differentiation. Our results further suggest the independent domestication of indica and japonica, the dual origins of the indica rice from China and South Asia (India), and the differentiation of the ecotypes 'javanica' and the 'temperate japonica' within the japonica subspecies.