Evaluation of yield performance in rice near-isogenic lines with increased spikelet number
Evaluation of yield performance in rice near-isogenic lines with increased spikelet number
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DOI：
10.1016/j.fcr.2010.08.013
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发表时间：
2011-01-14
影响因子：
5.8
通讯作者：
Kondo, Motohiko
中科院分区：
文献类型：
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作者：
Ohsumi, Akihiro;Takai, Toshiyuki;Kondo, Motohiko
水稻产量潜力取决于库大小和源容量之间的平衡。为了阐明限制温带粳稻品种产量的因素，我们比较了温带粳稻品种 Sasanishiki 的产量表现与 Sasanishiki 的三个近等基因系 (NIL) 的产量表现，其中来自高产籼稻品种 Habataki 的数量性状位点 (QTL) 基因渗入：qSBN1，该基因座增加了次生轴分枝的数量； qPBN6，增加初级轴分支的数量；以及结合这两个 QTL 的金字塔系。 NIL (SBN1)、NIL (PBN6) 和 NIL (SBN1 + PBN6) 每穗的小穗数分别比 Sasanishiki 多 28-37%、9-16% 和 62-65%。然而，每穗粒数增加的NIL并没有显着提高籽粒产量，因为不同产量组成之间发生了补偿。然而，由于碳水化合物从茎到穗的转移较多，金字塔系的产量比 Sasanishiki 高 4-12%。 Sasanishiki 和三个 NIL 之间抽穗前碳水化合物积累或生物量生产没有差异。结果表明，增加库大小并不能显着提高 Sasanishiki 的产量，因为 Sasanishiki 缺乏足够的底物供应来完全满足小穗数量 QTL 导致的库需求的增加。 (C) 2010 Elsevier B.V. 保留所有权利。
Rice yield potential is determined by the balance between sink size and source capacity. To clarify the factors that limit yield in temperate japonica cultivars, we compared the yield performance of Sasanishiki, a temperate japonica cultivar, with those of three near-isogenic lines (NILs) of Sasanishiki with introgression of quantitative trait loci (QTL) derived from a high-yielding indica cultivar, Habataki: qSBN1, which increases the number of secondary rachis branches; qPBN6, which increases the number of primary rachis branches; and a pyramid line that combines these two QTLs. NIL (SBN1), NIL (PBN6), and NIL (SBN1 + PBN6) produced 28-37%, 9-16%, and 62-65% more spikelets per panicle than Sasanishiki, respectively. However, the NILs with increased spikelet number per panicle did not increase grain yield significantly, because compensation is taken place among different yield components. The pyramid line nevertheless had 4-12% higher yield than Sasanishiki due to greater translocation of carbohydrates from stem to panicle. There was no difference in carbohydrate accumulation before heading or in biomass production among Sasanishiki and the three NILs. The results indicate that increasing sink size does not substantially improve yield in Sasanishiki, which lacks sufficient substrate supply to fully satisfy the increased sink demand that results from the spikelet-number QTLs. (C) 2010 Elsevier B.V. All rights reserved.