Hagen Eric R, Beaulieu Jeremy M
Department of Biological Sciences, University of Arkansas, Fayetteville, AR 72701, USA.
Department of Ecology & Evolutionary Biology, University of Toronto, Toronto, ON M5S 3B2, Canada.
Ann Bot. 2024 Dec 31;134(6):923-932. doi: 10.1093/aob/mcae143.
Since the mid-20th century, it has been argued by some that the transition from diploidy to polyploidy is an 'evolutionary dead end' in plants. Although this point has been debated ever since, multiple definitions of 'dead end' have been used in the polyploidy literature, without sufficient differentiation between alternative uses.
Here, we focus on the two most common conceptions of the dead-end hypothesis currently discussed: the 'lowering diversification' hypothesis and the 'rarely successful' hypothesis. We discuss the evidence for both hypotheses, and we use a recently developed method of inferring tip diversification rates to demonstrate tests for the effect of ploidy on diversification in Solanaceae.
We find that diversification rates in the family are not strongly correlated with ploidy or with the closely related trait of breeding system. We also outline recent work in the field that moves beyond the relatively simple question of whether polyploidy increases, decreases or does not significantly affect diversification rates in plants.
自20世纪中叶以来，一些人认为植物从二倍体到多倍体的转变是一个“进化死胡同”。尽管从那时起这一观点就一直存在争议，但在多倍体文献中对“死胡同”有多种定义，且不同用法之间没有得到充分区分。
在这里，我们关注当前讨论的死胡同假说的两种最常见概念：“降低多样化”假说和“极少成功”假说。我们讨论了这两种假说的证据，并使用一种最近开发的推断末端多样化速率的方法来展示对茄科中倍性对多样化影响的测试。
我们发现该科的多样化速率与倍性或与密切相关的繁殖系统性状没有强烈关联。我们还概述了该领域最近的研究工作，这些工作超越了多倍体是否增加、降低或不显著影响植物多样化速率这一相对简单的问题。
