Effects of a major gene Ur1 characterized by undulation of rachis branches on yield and its related traits in rice
Effects of a major gene Ur1 characterized by undulation of rachis branches on yield and its related traits in rice
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DOI：
10.1270/jsbbs.52.299
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发表时间：
2002-12-01
期刊：
影响因子：
2.4
通讯作者：
Ihashi, S
中科院分区：
文献类型：
--
作者：
Murai, M;Sato, S;Ihashi, S
不完全显性基因Ur1的特征是初级和次级轴分支的波动。由于次生分枝的增加，该基因增加了每穗的小穗数量。在粳稻品种台中65的共同遗传背景下产生了带sd1的Ur1/Ur1、Ur1/+和+/+基因型（分别表示为u、h和d，即三个矮秆）和不带sd1的基因型（分别为U、H和T，即三个高）。这6个基因型于2000年种植。产量及其相关性状为测量。产量方差分析表明，Ur1 的影响显着，而 sd1 和 Ur1 x sd1 交互作用的影响不显着。基因型u和h的产量显着高于d； h 显示所有基因型的最高产量。三个塔的产量顺序为 H 大于或等于 U 大于或等于 T (H > T)。对于每穗的小穗数，基因型的顺序为 u = U > h 大于或等于 H > T > d，反映了 Url 的主效应。对于每 m(2) 的穗数，Url 的影响并不显着。 6个基因型的成熟粒率与每穗粒数几乎呈倒序。各基因型的千粒重顺序为：U一致，u小于或等于h小于或等于H小于或等于d<T。库大小2（单粒重×每m（2）受精小穗数）与产量呈高度正相关。至于LAI，六种基因型之间没有显着差异。三种矮化基因型成熟时每 m(2) 的总重量按 h >= u >= d (h > d) 的顺序排列。收获指数u、h均高于d。 1998 年，在三种肥料水平下，三种矮化基因型也获得了类似的结果。因此，Ur1 通过增加每 m(2) 的小穗数量扩大了库面积，从而提高了产量。因此，Ur1可用于开发Ur1/+基因型的高产自交品种和F-1品种。
An incompletely dominant gene Ur1 is characterized by undulation of primary and secondary rachis branches. The gene increases spikelet number per panicle owing to increase of secondary branches. The Ur1/Ur1, Ur1/+ and +/+ genotypes with sd1 (denoted by u, h and d, respectively, viz. three dwarfs) and those without sd1 (U, H and T, respectively, viz. three talls) were produced under the common genetic background of a japonica variety Taichung 65. The six genotypes were grown in 2000. Yield and its related traits were measured. Analysis of variance on yield indicated that the effect of Ur1 was significant whereas the effects of sd1 and the Ur1 x sd1 interaction were nonsignificant. Genotypes u and h had significantly higher yields than d; h showed the highest yield of all genotypes. The three talls had yields in the order of H greater than or equal to U greater than or equal to T (H > T). Regarding spikelet number per panicle, the genotypes were in the order of u = U > h greater than or equal to H > T > d, reflecting the principal effect of Url. Regarding panicle number per m(2), the effect of Url was not significant. The ripened-grain percentages of the six genotypes were almost in the reverse order of spikelet number per panicle. The 1000 grain weight of the genotypes was in the order of U congruent to u less than or equal to h less than or equal to H less than or equal to d < T. Sink size-2 (single grain weight x fertilized-spikelet number per m(2)) showed a high positive correlation with yield. As for LAI, there were no significant differences among the six genotypes. The total weight per m(2) at maturity for the three dwarf genotypes were in the order of h >= u >= d (h > d). As for harvest index, u and h were higher than d. Similar results were obtained for the three dwarf genotypes under three fertilizer levels in 1998. Thus, Ur1 enlarged sink size through increase of spikelet number per m(2) resulting in higher yield. Consequently, Ur1 may be utilized for developing high yielding inbred varieties and F-1 varieties at the Ur1/+ genotype.