在物种内部的花进化揭示了在初始授粉者转移期间适应性行走的趋同
Katherine E Wenzell1,2,3,4, Mikhaela Neequaye1, Pirita Paajanen1
1John Innes Centre, Norwich, UK.
Nature communications
|March 20, 2025
概括
花的融合进化表明黄色的花朵吸引了蜜蜂,而不是蜂鸟. 这种由大型突变驱动的花颜色变化,启动了适应性行走和生殖隔离.
科学领域:
- 进化生物学是进化的生物学.
- 植物物种化 植物物种化
- 分子进化的分子进化.
背景情况:
- 适应性步行将表型,基因和健康联系起来,推动进化变化.
- 花的进化,特别是颜色的变化,可以导致快速的繁殖隔离和物种化.
- 子花 (Mimulus 分派) 是一种植物. 黄花 (Erythranthe) 呈现出来自红色祖先的黄色花的融合进化,这表明有传粉者转移.
研究的目的:
- 为了研究与红色花的亲属相比,黄色花的花形态 (M. cardinalis和M. verbenaceus) 的融合进化.
- 分析花表型,生物化学,转录学,基因组学和这些形态中的授粉者相互作用.
- 阐明适应性行走的早期阶段及其在繁殖隔离和物种化中的作用.
主要方法:
- 对花特征,颜色生物化学和基因表达的比较分析.
- 转录和基因组变异评估.
- 授粉者相互作用的观察和偏好测试.
主要成果:
- 两种黄色形态都显示出对花色素和基因表达等大效应特征的融合进化.
- 黄色的花朵被大熊蜂强烈喜欢,而不是蜂鸟.
- 气味和花尺寸的变化效果较小也有利于蜜蜂授粉,表明从蜂鸟授粉转变.
结论:
- 融合的大效果突变 (花色) 可以驱动授粉者吸引力,并启动适应性步行.
- 随后的较小影响的变化有助于适应新的授粉者.
- 这些持续的适应性步行有助于繁殖隔离和通过融合进化的初始物种化.
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