The origin of the legumes is a complex paleopolyploid phylogenomic tangle closely associated with the Cretaceous-Paleogene (K-Pg) mass extinction event

The consequences of the Cretaceous-Paleogene (K-Pg) boundary (KPB) mass extinction for the evolution of plant diversity remain poorly understood, even though evolutionary turnover of plant lineages at the KPB is central to understanding assembly of the Cenozoic biota. The apparent concentration of whole genome duplication (WGD) events around the KPB may have played a role in survival and subsequent diversification of plant lineages. To gain new insights into the origins of Cenozoic biodiversity, we examine the origin and early evolution of the globally diverse legume family (Leguminosae or Fabaceae). Legumes are ecologically (co-)dominant across many vegetation types, and the fossil record suggests that they rose to such prominence after the KPB in parallel with several well-studied animal clades including Placentalia and Neoaves. Furthermore, multiple WGD events are hypothesized to have occurred early in legume evolution. Using a recently inferred phylogenomic framework, we investigate...

白垩纪-古近纪（K-Pg）界线（KPB）大灭绝事件对植物多样性演化的影响迄今仍不甚明晰，尽管该界线处植物支系的演化更替是理解新生代生物群组成的核心议题。此前学界推测，全基因组复制（whole genome duplication, WGD）事件在KPB界线前后的集中发生，可能在植物支系的存活及后续辐射分化中发挥了作用。为深入解析新生代生物多样性的起源，本研究针对全球广布的豆科（Leguminosae或称Fabaceae）类群的起源与早期演化展开探讨。豆科植物在诸多植被类型中均占据生态主导（或协同主导）地位，化石记录显示，其生态优势地位正是在KPB界线之后逐步确立，与胎盘类（Placentalia）、新鸟类（Neoaves）等多个被广泛研究的动物支系的辐射演化过程平行发生。此外，多项研究推测豆科演化早期曾发生多次全基因组复制事件。本研究借助新近构建的系统基因组学框架，对……展开探究