城市向日的复活:前代和现代人群之间的表型和分子变化,相隔36年
Marissa M Spear1, Sophie J Levi1, Julie R Etterson1
1Department of Biology, University of Minnesota Duluth, Duluth, Minnesota, USA.
Molecular ecology
|September 5, 2023
概括
城市向日 (Helianthus annuus) 在36年中显示出显著的进化,现代植物表现出改变的基因表达和受气候变化和作物侵入影响的特征. 这些发现突出了对人类因素的快速适应.
科学领域:
- 进化生物学 进化生物学
- 植物科学 植物科学
- 基因组学就是基因组学.
背景情况:
- 复活实验提供了关于在环境压力下表型和分子进化的见解.
- 城市种群的Helianthus annuus提供了一个研究适应人类变化的模型.
研究的目的:
- 通过分子和定量遗传学研究Helianthus annuus种群的36年进化轨迹.
- 为了比较原始和现代的向日种群的基因表达,特征和可遗传性的差异.
- 评估环境因素和作物侵入对城市向日进化的影响.
主要方法:
- 基因表达特征的比较前代 (36岁的种子) 和现代的Helianthus annuus种群.
- 在受控的水和温度条件下对表型特征的定量遗传分析.
- 混合物分析以检测从养品种到现代种群的基因流动.
- 现型选择分析和遗传性估计.
主要成果:
- 鉴定了200个差异表达的转录,在现代样本中表达更高.
- 现代种群与前代种群有显著的表型差异,其中一些特征与气候变化预期相吻合,另一些特征与作物品种相匹配.
- 现代人群在选择过程中表现出偏好的特征值,特别是在当代环境条件下.
- 与先例种群相比,现代种群的特征遗传能力明显较低,并且表型可塑性减少.
结论:
- 城市Helianthus annuus的进化是由作物野生侵入,适应性选择和遗传漂移的组合形成的.
- 现代人群表现出改变的基因表达,降低遗传性和减少可塑性,反映出快速适应城市环境.
- 人类造成的因素,包括气候变化和作物中的基因流动,是这种物种持续进化的关键驱动因素.
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