Genomic architecture of heterosis for yield traits in rice
Genomic architecture of heterosis for yield traits in rice
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DOI：
10.1038/nature19760
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发表时间：
2016-09-29
期刊：
影响因子：
64.8
通讯作者：
Han, Bin
中科院分区：
文献类型：
--
作者：
Huang, Xuehui;Yang, Shihua;Han, Bin
提高粮食产量是作物育种的长期目标，以满足全球粮食安全的需求。当杂种在某一性状上表现出比双亲更高的表现时，杂种优势为作物育种提供了重要的策略。为了研究水稻产量杂种优势的遗传基础，我们在这里生成、测序并记录了来自 17 个代表性杂交水稻杂交的 10,074 个 F-2 品系的表型。我们将现代杂交水稻品种分为三组，代表不同的杂交育种系统。尽管我们没有发现所有品系之间共享任何杂种优势相关基因座，但在每个组内，来自母本的少量基因组基因座解释了杂种相对于其父本的产量优势的大部分。对于其中一些基因座，当所有谷物产量性状一起考虑时，我们发现支持产量相关性状的杂合基因座的部分显性和总体性能的更好亲本杂种优势。这些结果为杂种优势和水稻杂交育种的基因组结构提供了信息。
Increasing grain yield is a long-term goal in crop breeding to meet the demand for global food security. Heterosis, when a hybrid shows higher performance for a trait than both parents, offers an important strategy for crop breeding. To examine the genetic basis of heterosis for yield in rice, here we generate, sequence and record the phenotypes of 10,074 F-2 lines from 17 representative hybrid rice crosses. We classify modern hybrid rice varieties into three groups, representing different hybrid breeding systems. Although we do not find any heterosis-associated loci shared across all lines, within each group, a small number of genomic loci from female parents explain a large proportion of the yield advantage of hybrids over their male parents. For some of these loci, we find support for partial dominance of heterozygous locus for yield-related traits and better-parent heterosis for overall performance when all of the grain-yield traits are considered together. These results inform on the genomic architecture of heterosis and rice hybrid breeding.