Department of Horticulture, Michigan State University, East Lansing, MI 48824, USA; Ecology, Evolutionary Biology and Behavior, Michigan State University, East Lansing, MI 48824, USA.
Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL 35487, USA.
Curr Opin Plant Biol. 2018 Apr;42:76-80. doi: 10.1016/j.pbi.2018.03.006. Epub 2018 Apr 9.
Whole genome duplications (WGDs), also known as polyploid events, have played a crucial role in the evolutionary success of angiosperms across recent and ancient timescales. A recurrent observation from the analysis of allopolyploids is that one of the parental subgenomes is generally more dominant, referred to as 'subgenome dominance', based on higher gene content and expression patterns. Subgenome dominance has far reaching implications to research areas ranging from crop improvement efforts to evolutionary and ecological studies. However, the analysis of subgenome dominance in more ancient polyploids is complicated by a long history of homoeologous exchanges among subgenomes. Here, we will discuss how resulting homoeolog rearrangements and replacements have been ignored in previous studies and urge future studies to integrate phylogenetic approaches to assign homoeologs to parental subgenomes.
全基因组加倍（WGDs），也称为多倍体事件，在被子植物的近期和远古时间尺度的进化成功中发挥了关键作用。从分析异源多倍体中反复观察到的一个现象是，两个亲本亚基因组中的一个通常更为占主导地位，称为“亚基因组优势”，这是基于更高的基因含量和表达模式。亚基因组优势对从作物改良到进化和生态研究的各个研究领域都有着深远的影响。然而，在更远古的多倍体中分析亚基因组优势时，由于亚基因组之间存在同源重组的悠久历史，情况变得更加复杂。在这里，我们将讨论在先前的研究中如何忽略了同源重组的重排和替换，并敦促未来的研究整合系统发育方法，将同源基因分配到亲本亚基因组中。
