Identification of QTLs conferring genetic variation for heading date among rice varieties at the northern-limit of rice cultivation
Identification of QTLs conferring genetic variation for heading date among rice varieties at the northern-limit of rice cultivation
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DOI：
10.1270/jsbbs.55.141
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发表时间：
2005-06-01
期刊：
影响因子：
2.4
通讯作者：
Sekiguchi, H
中科院分区：
文献类型：
--
作者：
Fujino, K;Sekiguchi, H
在特定地区的最佳范围内适当地改变抽穗日期是水稻育种计划的一个重要目标。在水稻栽培的北海道（日本）、葡萄牙、匈牙利和意大利的水稻品种中鉴定出了抽穗日期遗传变异的数量性状位点。根据抽穗期的分离分析，将这些品种分为北海道品种和欧洲品种两类。利用Hayamasari（北海道）与Italica Livorno（意大利）的回交自交系（BILs）在6号和7号染色体上检测到两个控制抽穗日期的qtl。最有效的QTL是7号染色体上的qDTH-7，占总表型变异的64.5%。此外，在北海道Hoshinoyume与葡萄牙Arroz Da Terra或匈牙利Dunghung Shali杂交的两个BIL群体中，观察到抽穗天数与qDTH-7区域的标记基因型之间存在明显的关系。对这些品种的光周期敏感性分析表明，qDTH-7参与了这些品种的光周期敏感性。这些结果表明，qDTH-7负责将水稻栽培的北界品种分为两类。
Appropriate variation of heading date within the optimum range in a particular region is an important objective in rice breeding programs. Quantitative trait loci (QTLs) conferring genetic variation for heading date were identified among the rice varieties in the northern-limits of rice cultivation, Hokkaido (Japan), Portugal, Hungary and Italy. Based on segregation analyses of heading date, these varieties were categorized into two groups: one included the Hokkaido varieties and the other included the European varieties. Two QTLs controlling heading date were detected on chromosomes 6 and 7 using backcross inbred lines (BILs) derived from a cross between Hayamasari (Hokkaido) and Italica Livorno (Italy). The most effective QTL, qDTH-7 on chromosome 7, accounted for 64.5% of total phenotypic variation. Also, clear relationships between days to heading and the marker genotypes that were located in the region of qDTH-7 were observed in the two BIL populations from the crosses of Hoshinoyume (Hokkaido) with Arroz Da Terra (Portugal) or Dunghung Shali (Hungary). Estimation of the photoperiod sensitivity for these varieties indicated that qDTH-7 is involved in photoperiod sensitivity. These results indicate that qDTH-7 was responsible for distinguishing the varieties in the northern-limits of rice cultivation into the two groups.