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Heterosis: revisiting the magic

机译:杂种:重温魔术

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Heterosis results in the phenotypic superiority of a hybrid over its parents with respect to traits such as growth rate, reproductive success and yield. This hybrid vigor is determined by non-mutually exclusive mechanisms, including dominance complementation, overdominance and epistasis. Heterotic genes responsible for elevating crop yields are now being sought using genomics, particularly transcriptomics, but with contradictory results. Because heterosis is an environmentally modified quantitative phenotype, genomic analyses alone will not suffice. Future research should focus on integrating genomic tools in a framework of comprehensive quantitative trait locus (QTL)-based phenotyping, followed by map-based cloning. This 'phenomics' approach should identify loci controlling heterotic phenotypes, and improve understanding of the role of heterosis in evolution and the domestication of crop plants.
机译:杂种优势导致杂种在生长速度,生殖成功和产量等方面在表型方面优于其亲本。这种混合活力是由非互斥机制决定的,包括优势互补,优势和上位性。现在正在寻求使用基因组学,特别是转录组学来提高作物产量的异质基因,但结果却矛盾。因为杂种优势是一种环境修饰的定量表型,所以仅靠基因组分析是不够的。未来的研究应着重于将基因组工具整合到基于全面数量性状基因座(QTL)的表型分析框架中,然后进行基于图的克隆。这种“基因组学”方法应确定控制杂种表型的基因座,并增进对杂种优势在作物植物进化和驯化中的作用的了解。

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