Biology Department, University of Konstanz, Konstanz, Baden-Württemberg, Germany.
Biology Department, Trent University, Peterborough, Ontario, Canada.
Biol Lett. 2020 Sep;16(9):20200402. doi: 10.1098/rsbl.2020.0402. Epub 2020 Sep 30.
An annual life history is often associated with the ability to self-fertilize. However, it is unknown whether the evolution of selfing commonly precedes the evolution of annuality, or . Using a 2-year common garden experiment, we asked if the evolution of selfing in the normally perennial was accompanied by a shift towards the annual habit. Despite their very recent divergence from obligately outcrossing populations, selfing plants exhibited a 39% decrease in over-winter survival after the first year compared with outcrossing plants. Our data ruled out the most obvious underlying mechanism: differences in reproductive investment in the first year did not explain differences in survival. We conclude that transitions to selfing in perennial may be accompanied by a shift towards annuality, but drivers of the process require further investigation.
一个年度的生活史通常与自我受精的能力有关。然而，目前还不清楚自交的进化是否通常先于一年生的进化，或者说相反。使用一个为期 2 年的共同花园实验，我们询问了在通常为多年生的 中自交的进化是否伴随着向一年生习性的转变。尽管它们最近才从强制异交种群中分化出来，但与异交植物相比，自交植物在第一年之后的越冬存活率下降了 39%。我们的数据排除了最明显的潜在机制：第一年生殖投资的差异并不能解释存活率的差异。我们的结论是，向多年生 中自交的转变可能伴随着向一年生习性的转变，但该过程的驱动因素需要进一步调查。
