种群内和种群间的比较表明,独立行动的选择维持了苏格兰松 (Pinus sylvestris) 的平行结合线
Sonja T Kujala1, Komlan Avia2,3, Timo A Kumpula2
1Natural Resources Institute Finland, Oulu, Finland.
Evolution letters
|March 25, 2024
概括
苏格兰松树的平行结合在苏格兰松树的特征是通过很大程度上独立的选择来维持的,这允许适应不断变化的气候. 这项研究调查了芽时间,身高和伤的遗传变异和选择.
科学领域:
- 生态生态学 生态生态学
- 进化生物学 进化生物学
- 森林遗传学 森林遗传学
背景情况:
- 沿着环境梯度的适应性人口分歧可能是多个特征或相关反应的独立选择的结果.
- 在苏格兰松树 (Pinus sylvestris) 中,芽时间 (BST),第一年的高度 (FYH) 和秋季伤 (FFI) 呈现平行临床变化.
- 了解这些基因的遗传基础需要检查种群内部和种群之间的变异,遗传相关性和选择.
研究的目的:
- 为了区分独立选择和相关反应,在苏格兰松树苗的特征中驱动平行结合.
- 研究自然种群内和自然种群之间的BST,FYH和FFI的遗传变异,相关性和选择梯度.
- 评估这些发现对适应不断变化的环境条件的影响.
主要方法:
- 建立了一个常见的花园实验,使用来自苏格兰松树种群的开放授粉后代跨越一个度梯度.
- 在温室中测量了幼苗特征 (BST,FYH,FFI),并在9岁时在现场评估了健康代理 (生存,身高).
- 对比了种群之间的和种群内部的遗传相关性,并估计了家族层面的选择梯度,考虑到种子重量.
主要成果:
- 种苗特征的种群间遗传相关性很高 (0.760.95).
- 在人群内遗传相关性较低 (0.140.35在主要人群中;0.100.39在其他人群中).
- 种群内部仍然存在广泛的适应变异,弱的选择梯度维持了临界线,这表明特征上的选择在很大程度上是独立的.
结论:
- 苏格兰松树苗苗的特征很可能是由大大独立的选择压力维持的.
- 较低的种群内遗传相关性表明,与强大的种群间相关性相比,适应的约束较小.
- 在特征上的独立选择为适应不断变化的气候提供了更大的灵活性.
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