在花杂交区的波动性选择
Diana Tataru1, Max De Leon1, Spencer Dutton1
1Department of Ecology and Evolutionary Biology, Tulane University, New Orleans, LA, United States.
Evolution letters
|February 5, 2025
概括
花物种之间的杂交可以引入有益的干旱适应性特征,但遗传不相容性可能会限制其适应潜力. 选择压力各不相同,影响这些混合区的基因流动.
科学领域:
- 进化生物学 进化生物学
- 生态生态学 生态生态学
- 遗传学 是一个遗传学.
背景情况:
- 在历史上,杂交被视为适应和物种化的障碍.
- 最近的研究强调了杂交在进化过程中的作用.
- 环境变化对混合区维护的影响尚不清楚.
研究的目的:
- 为了确定杂交是否适应性,Mimulus guttatus和Mimulus laciniatus之间.
- 研究空间和时间选择在维持自然杂交区中的作用.
- 评估父母物种和杂交物种在不同环境条件下的适应性.
主要方法:
- 父母和杂交花世代的重复互移植.
- 在内华达山脉,干旱 (2021) 和潮湿 (2023) 年的环境数据收集.
- 在自然杂交和纯种群中对基因型的适应性评估.
主要成果:
- 混合区的环境类似于M. laciniatus.的干燥息地.
- 混合体的健身优势不一致;对混合体的选择很弱.
- 在两种物种的息地中,M. laciniatus表现出比M. guttatus更好的适应性.
- 现型选择有利于在干旱年期间在混合区的M. laciniatus类特征.
- 在雨季期间,在第二代杂交品种中观察到遗传不相容.
结论:
- 杂交可能会将M. laciniatus的适应性干旱耐受性特征引入M. guttatus,特别是在干燥的条件下.
- 杂交的适应性价值被潜在的成本所平衡,例如遗传不相容性.
- 积极和消极选择之间的复杂相互作用可能会塑造Mimulus杂交区的基因流动模式.
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