在黄花种主要是自私的种群中,对耻辱 - 其他距离选择的反应较弱
Shelby L Tisinai1, Jeremiah W Busch1
1School of Biological Sciences, Washington State University, Pullman, WA, USA.
Proceedings. Biological sciences
|June 18, 2024
概括
自我血统可能具有有限的进化潜力. 一项关于黄花的研究发现,主要是自私的人群的适应能力下降,这表明随着转向自我授粉,进化潜力下降.
科学领域:
- 进化生物学是进化的生物学.
- 植物生殖策略 植物生殖策略
- 人口遗传学 人口遗传学
背景情况:
- 假设Selfing血统由于遗传变异减少而具有有限的适应潜力.
- 对于自杀率至关重要的花特征的定量遗传变异在自杀种群中并未得到充分理解.
- 黄色子花 (Mimulus guttatus) 通常超越并保持高遗传变异的花特征.
研究的目的:
- 为了研究一个主要是自私的 Mimulus guttatus 种群的进化潜力.
- 为了测试这种假设,自我的血统已经降低了适应能力,特别是对于影响自我的速度的特征.
- 为了比较一个自我种群的遗传变异和适应潜力与其外交的亲属.
主要方法:
- 研究了来自加利福尼亚州博德加湾的Joy Road的Mimulus guttatus主要自私种群.
- 量化了全基因组的变异,并将其与更高度超越的种群进行了比较.
- 在 stigma-anther distance (SAD) 上进行了五代人造选择实验,这是自杀率的关键决定因素.
- 从选择实验中计算出SAD的实现遗传性.
主要成果:
- 与外交种群相比,自我交叉的Mimulus guttatus种群在全基因组变异中显示出适度的33%的减少.
- 对SAD的人工选择产生了较弱的表型反应.
- 对SAD的确定的遗传性明显低 (0.020-0.028) 比对外交种群的花型特征的遗传性低,下降了84%.
结论:
- 在Mimulus guttatus中,向自我转变与进化潜力的大幅下降有关.
- 这些发现支持这样一个假设:自我可以限制适应能力.
- 需要进一步的研究,以了解这些局限性是否解释了对超越和自我一般适应极限的逆转的稀有性.
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