Genetic erosion from modern varieties into traditional upland rice cultivars (Oryza sativa L.) in northern Thailand
Genetic erosion from modern varieties into traditional upland rice cultivars (Oryza sativa L.) in northern Thailand
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DOI：
10.1007/s10722-004-6132-y
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发表时间：
2006-03-01
影响因子：
2
通讯作者：
Sato, YI
中科院分区：
文献类型：
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作者：
Ishikawa, R;Yamanaka, S;Sato, YI
本研究的目的是评估泰国北方传统高地种质的遗传侵蚀的程度，作为一个结果，从不同的菌株携带不同的基因型的基因流。即使现代品种特异性标记尚未开发，老挝也有一个比较群体。因此，这两个群体进行了比较，各种字符，以评估基因流从现代品种的地方品种。粘性和无毛菌株在老挝占主导地位。然而，在泰国东北部，这种菌株急剧减少。基因多样性较高，在泰国相比，老挝在7个同工酶位点。这是由于在泰国的籼稻品系和杂合子的频率较高。质体类型也通过使用INDEL标记来确定。近一半的籼稻菌株携带粳稻质体。杂合子也倾向于携带粳稻细胞质。这种核质替代株系和杂合子可能是自然杂交产生的。粳稻比籼稻更倾向于母源供体。或者籼稻品种很容易释放花粉，而花粉生长在高地以外的地方。
The purpose of this study was to assess the extent of genetic erosion of traditional upland germplasm in northern Thailand as a result of gene-flow from distinct strains carrying different genotypes. Even modern variety specific markers have not been developed, there is a comparative population in Laos. Thus, both populations were compared with various characters to evaluate gene-flow from modern variety to landraces. Glutinous and glabrous strains are predominated in Laos. However, such strains were drastically decreased in north-east Thailand. Gene diversity is higher in Thailand, compared to Laos at seven isozyme loci. This was a result of the higher frequencies of Indica strains and heterozygotes in Thailand. Plastid type was also determined by using an INDEL marker. Nearly half of Indica strains carried the Japonica plastid. Heterozygotes also tended to carry Japonica cytoplasm. Such nuclear-cytoplasm substituted strains and heterozygotes were probably generated by natural hybridization. Japonica strains tended to be a maternal donor rather than Indica ones. Or Indica strains would easily release pollens, which grow outside of upland fields.