Accumulation of additive effects generates a strong photoperiod sensitivity in the extremely late-heading rice cultivar 'Nona Bokra'
Accumulation of additive effects generates a strong photoperiod sensitivity in the extremely late-heading rice cultivar 'Nona Bokra'
复制标题
DOI：
10.1007/s00122-007-0534-0
复制
发表时间：
2007-05-01
影响因子：
5.4
通讯作者：
Yano, M.
中科院分区：
文献类型：
--
作者：
Uga, Y.;Nonoue, Y.;Yano, M.
许多起源于低纬度地区的水稻品种表现出很强的光周期敏感性，在长日照条件下抽穗极晚。在日本种植季节的自然日长条件下，来自印度的籼稻品种'Nona Bokra'与来自日本的粳稻品种'Koshihikari'（105天）相比，显示出极晚的抽穗（抽穗202天）。为了阐明与这种极端晚抽穗相关的遗传因素，我们进行了抽穗期的数量性状位点（QTL）分析使用F-2群体和7个先进的回交后代（BC 1F 2和BC 2F 2）之间的“Nona Bokra”和“越光”的杂交。共检测到7条染色体上的12个QTL。所有QTL的“Nona Bokra”等位基因均对抽穗期的增加有贡献。QTL间很少观察到双基因互作。基于QTL的遗传参数，如加性效应和解释的表型方差的百分比，这12个QTL可能产生了很大比例的表型变异观察到的抽穗期之间的'Nona Bokra'和'Koshihikari'。将本研究中检测到的抽穗期QTL与以前在‘日本晴’和‘Kasalath’群体中检测到的QTL进行染色体定位比较，发现其中8个QTL位于Hd 1、Hd2、Hd 3a、Hd 4、Hd 5、Hd 6、Hd 9和Hd 13附近。这些结果表明，“Nona Bokra”的强PS主要是由先前确定的QTL上特定等位基因的加性效应积累而产生的。
Many rice cultivars that originated from lower-latitude regions exhibit a strong photoperiod sensitivity (PS) and show extremely late heading under long-day conditions. Under natural day-length conditions during the cropping season in Japan, the indica rice cultivar 'Nona Bokra' from India showed extremely late heading (202 days to heading) compared to the japonica cultivar 'Koshihikari' (105 days), from Japan. To elucidate the genetic factors associated with such extremely late heading, we performed quantitative trait locus (QTL) analyses of heading date using an F-2 population and seven advanced backcross progeny (one BC1F2 and six BC2F2) derived from a cross between 'Nona Bokra' and 'Koshihikari'. The analyses revealed 12 QTLs on seven chromosomes. The 'Nona Bokra' alleles of all QTLs contributed to an increase in heading date. Digenic interactions were rarely observed between QTLs. Based on the genetic parameters of the QTLs, such as additive effects and percentage of phenotypic variance explained, these 12 QTLs are likely generate a large proportion of the phenotypic variation observed in the heading dates between 'Nona Bokra' and 'Koshihikari'. Comparison of chromosomal locations between heading date QTLs detected in this study and QTLs previously identified in 'Nipponbare' 'Kasalath' populations revealed that eight of the heading date QTLs were recognized nearby the Hd1, Hd2, Hd3a, Hd4, Hd5, Hd6, Hd9, and Hd13. These results suggest that the strong PS in 'Nona Bokra' was generated mainly by the accumulation of additive effects of particular alleles at previously identified QTLs.