Phenotypic Plasticity in the Invasion of Crofton Weed (Eupatorium adenophorum) in China
Phenotypic Plasticity in the Invasion of Crofton Weed (Eupatorium adenophorum) in China
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DOI：
10.1614/ws-d-11-00198.1
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
Yujie Zhao;Xuejun Yang;X. Xi;Xianming Gao;Shucun Sun
中科院分区：
文献类型：
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作者：
Yujie Zhao;Xuejun Yang;X. Xi;Xianming Gao;Shucun Sun
摘要表型可塑性和快速进化是入侵物种适应广泛环境的两种重要策略，与植物入侵密切相关。为了验证它们在杂草入侵成功中的重要性，我们对中国16个居群进行了田间调查、普通园艺试验和ISSR标记分析，研究了杂草的表型反应和遗传变异。分子标记显示样本群体间和群体内的遗传变异较小。田间群体间叶面积(LA)、比叶面积(SLA)和种子数(SN)差异显著，可塑性指数(PIV)分别为0.62、0.46和0.85。回归分析表明，种群来源的纬度对LA、SLA和SN有显著的二次效应，但对常见的园艺试验(温室和露天)中的性状没有显著的影响。来自不同种群的植物在两个共同的花园中表现出相似的功能特征反应标准。温室内的LA、SLA、地上生物量、株高、初花日和寿命均高于露天花园，而SN则低于露天花园。生长条件(温室和露天)以及生长条件和种群起源之间的相互作用显著影响植物的性状。综合证据表明，入侵范围内巴豆草的功能性状具有较高的表型可塑性，但遗传变异较低。因此，我们认为表型可塑性是中国作为一种能够适应不同环境的攻击性入侵植物的主要策略。命名：紫茎泽兰、紫茎泽兰、紫茎泽兰。
Abstract Phenotypic plasticity and rapid evolution are two important strategies by which invasive species adapt to a wide range of environments and consequently are closely associated with plant invasion. To test their importance in invasion success of Crofton weed, we examined the phenotypic response and genetic variation of the weed by conducting a field investigation, common garden experiments, and intersimple sequence repeat (ISSR) marker analysis on 16 populations in China. Molecular markers revealed low genetic variation among and within the sampled populations. There were significant differences in leaf area (LA), specific leaf area (SLA), and seed number (SN) among field populations, and plasticity index (PIv) for LA, SLA, and SN were 0.62, 0.46 and 0.85, respectively. Regression analyses revealed a significant quadratic effect of latitude of population origin on LA, SLA, and SN based on field data but not on traits in the common garden experiments (greenhouse and open air). Plants from different populations showed similar reaction norms across the two common gardens for functional traits. LA, SLA, aboveground biomass, plant height at harvest, first flowering day, and life span were higher in the greenhouse than in the open-air garden, whereas SN was lower. Growth conditions (greenhouse vs. open air) and the interactions between growth condition and population origin significantly affect plant traits. The combined evidence suggests high phenotypic plasticity but low genetically based variation for functional traits of Crofton weed in the invaded range. Therefore, we suggest that phenotypic plasticity is the primary strategy for Crofton weed as an aggressive invader that can adapt to diverse environments in China. Nomenclature: Crofton weed, Eupatorium adenophorum Spreng EUPAD.