Gembloux Agricultural University, Laboratory of Ecology, Passage des Déportés 2, Gembloux, Belgium.
J Evol Biol. 2009 May;22(5):917-26. doi: 10.1111/j.1420-9101.2009.01728.x.
Population differentiation of alien invasive plants within their non-native range has received increasingly more attention. Common gardens are typically used to assess the levels of genotypic differentiation among populations.However, in such experiments, environmental maternal effects can influence phenotypic variation among individuals if seed sources are collected from field populations under variable environmental regimes. In the present study, we investigated the causes of an altitudinal cline in an invasive plant. Seeds were collected from Senecio inaequidens (Asteraceae) populations along an altitudinal gradient in southern France. In addition, seeds from the same populations were generated by intra-population crossings in a climatic chamber. The two seed lots were grown in a common garden in Central Belgium to identify any evidence of environmentally induced maternal effects and ⁄ or an altitudinal cline in a suite of life-history traits. Results failed to detect any environmental maternal effects. However, an altitudinal cline in plant height and aboveground biomass was found to be independent of the maternal environment.
外来入侵植物在非原产地的种群分化受到了越来越多的关注。通常使用人工控制环境的栽培实验来评估种群间的基因型分化程度。然而，如果种子来源于不同环境条件下的野外种群，那么环境母体效应可能会影响个体间的表型变异。本研究调查了一种入侵植物产生海拔梯度变化的原因。从法国南部的一个海拔梯度上采集千里光属（菊科）种群的种子。此外，还在气候室内通过种群内杂交产生相同种群的种子。将这两个种子批种植在比利时中部的一个共同花园中，以确定是否存在任何由环境诱导的母体效应和/或一系列生活史特征的海拔梯度。结果未能检测到任何环境母体效应。然而，发现植物高度和地上生物量的海拔梯度与母体环境无关。
