达尔文的选择在一个自我位置上.
Kentaro K Shimizu1, Jennifer M Cork, Ana L Caicedo
1Department of Genetics, North Carolina State University, Box 7614, Raleigh, NC 27695, USA.
Science (New York, N.Y.)
|December 18, 2004
概括
在Arabidopsis thaliana的自我授粉的进化是由伪基因在自我不相容的位置驱动的,导致遗传变异减少. 这种最近的适应性事件可能与植物有关.
科学领域:
- 进化生物学是进化的生物学.
- 植物遗传学 植物遗传学
- 分子进化是分子进化的过程.
背景情况:
- 自传花是一种常见的进化过渡在开花植物.
- 在Arabidopsis thaliana中,自我兼容性受体 (SCR) 和自我不兼容性位置受体激酶 (SRK) 位点的伪基因与自我受精的进化有关.
- 由于正向选择,在SCR的伪基基因基因中观察到减少的核酸变异.
研究的目的:
- 为了研究推动Arabidopsis thaliana转向自我授粉的进化机制.
- 确定伪基因在SCR和SRK位点在自我受精的进化中的作用.
- 探索这个适应性事件的时间和潜在的生态关联.
主要方法:
- 在SCR和SRK自我不相容的位置分析伪基因等位基因.
- 确定作用于SCR假基因等位基因的积极定向选择.
- 凝聚期模拟以推断适应事件的时间及其与普莱斯托时代后扩张的关联.
主要成果:
- 积极的定向选择导致了SCR.的伪基基因基因的进化固定.
- 这种固定导致这些位置的核酸变异大大减少.
- 结合期模拟表明,这种适应性事件是最近发生的,并可能与普莱斯托时代后的阿拉比多普西斯·塔利亚纳的扩张有关.
结论:
- 在Arabidopsis thaliana中自我授粉的演变与伪基基基基因在SCR和SRK位点的固定有关.
- 这种由积极选择驱动的过渡,显著减少了遗传多样性.
- 与自我授粉相关的辅助形态创新可能在自我不兼容性丧失后迅速演变.
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