Institute of Biodiversity and Ecosystem Dynamics, University of Amsterdam, 1090 GE Amsterdam, The Netherlands.
Curr Opin Plant Biol. 2012 Apr;15(2):147-53. doi: 10.1016/j.pbi.2012.03.011. Epub 2012 Apr 3.
Many large and economically important plant groups (e.g. Brassicaceae, Poaceae, Asteraceae, Fabaceae and Solanaceae) have had ancient whole genome duplications (WGDs) occurring near or at the time of their origins, suggesting that WGD contributed to the origin of novel key traits and drove species diversification. However, these large clades show phylogenetic asymmetries with a species-rich crown group and a species-poor sister clade, suggesting significant 'lag-times' between WGDs and radiations. The species-poor sister groups share many key traits, but are often restricted to the hypothesized center of origin for the larger clade. Thus, the ultimate success of the crown group does not only involve the WGD and novel key traits, but largely subsequent evolutionary phenomena including later migration events, changing environmental conditions and/or differential extinction rates.
许多大型且经济重要的植物类群（例如：十字花科、禾本科、菊科、豆科和茄科）在起源附近或起源时发生了古老的全基因组加倍（WGD），这表明 WGD 促进了新的关键特征的出现，并推动了物种多样化。然而，这些大的分支在系统发育上存在不对称性，表现为一个物种丰富的冠群和一个物种贫乏的姊妹分支，这表明 WGD 与辐射之间存在显著的“滞后时间”。物种贫乏的姊妹分支共享许多关键特征，但通常局限于较大分支的假设起源中心。因此，冠群的最终成功不仅涉及 WGD 和新的关键特征，而且还涉及后来的进化现象，包括后来的迁移事件、环境条件的变化和/或不同的灭绝率。
