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Shade‐induced plasticity in invasive Impatiens glandulifera populations
Weed Research ( IF 1.7 ) Pub Date : 2019-12-02 , DOI: 10.1111/wre.12394
M Gruntman 1, 2 , U Segev 3 , K Tielbörger 2
Affiliation  

Phenotypic plasticity, which confers a fitness advantage under heterogeneous and novel environments, has been commonly suggested to contribute to the success of invasive plants in their introduced range. For example, plasticity in response to changes in light availability could facilitate invasiveness by allowing plants to both rapidly establish in unshaded, disturbed habitats, and tolerate shaded or crowded environments. The plastic responses of invasive plants to shade were mostly studied in morphological traits. However, plasticity in physiological traits might provide more rapid and reversible responses and thus be more effective in environments with rapid temporal variations. Here, we compared plasticity in a range of morphological and physiological traits that provide shade avoidance or tolerance between two native and six introduced populations of Impatiens glandulifera. In a common garden, we subjected second‐generation siblings of native and invasive plants to two light availability treatments and measured their morphological, physiological and performance responses. Impatiens glandulifera from invasive populations exhibited greater phenotypic plasticity in response to light availability in four out of 12 measured traits. Moreover, this greater plasticity was mostly limited to physiological traits associated with photosynthetic acclimation. These results suggest high phenotypic plasticity in response to light availability could have facilitated I. glandulifera's spread in both disturbed habitats and woodlands or under intense light competition. The results of this study highlight the importance of considering physiological traits when studying the role of plasticity in the success of invasive plants.

中文翻译:

入侵的凤仙花种群的树荫诱导可塑性

通常认为,表型可塑性在异质和新颖环境下具有适应性优势,有助于在其引入范围内为入侵植物的成功做出贡献。例如,对可利用光的变化做出响应的可塑性可以通过允许植物在没有阴影的,受干扰的栖息地中快速建立,并在阴影或拥挤的环境中忍受,从而促进入侵。外来入侵植物对树荫的塑性响应主要是在形态特征上进行的。但是,生理特性的可塑性可能会提供更快速和可逆的响应,因此在具有快速时间变化的环境中更有效。这里,凤仙花。在一个公共花园中,我们对原生植物和入侵植物的第二代同胞进行了两种光利用率处理,并测量了它们的形态,生理和功能响应。来自入侵种群的凤仙花表现出更大的表型可塑性,响应于12个测量性状中的4个的光利用率。而且,这种更大的可塑性主要限于与光合作用相关的生理特性。这些结果表明,对光利用率的高表型可塑性可能促进了兰氏I.在受干扰的栖息地和林地中或在激烈的光线竞争下都传播。这项研究的结果突出了在研究可塑性在入侵植物成功中的作用时考虑生理性状的重要性。
更新日期:2019-12-02
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