Palatability and tolerance to simulated herbivory in native and introduced populations of Alliaria petiolata (Brassicaceae)
Palatability and tolerance to simulated herbivory in native and introduced populations of Alliaria petiolata (Brassicaceae)
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DOI：
10.3732/ajb.91.6.856
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发表时间：
2004-06-01
影响因子：
3
通讯作者：
Auge, H
中科院分区：
文献类型：
--
作者：
Bossdorf, O;Schröder, S;Auge, H
欧洲草本植物蒜芥（Alliaria petiolata）是北美落叶森林的严重入侵者。对其成功的一种解释可能是，在缺乏专门的食草动物的情况下，选择倾向于防御较少但更有活力的基因型。通过比较几个本地和引进的Alliaria种群的后代对昆虫食草动物的适口性和对模拟食草动物的耐受性，解决了这一想法。来自本土地区的一种特殊象鼻虫对美国植物的取食率明显更高，这表明在引进地区失去了抵抗力。通才毛虫的取食率存在显著的种群变异，但没有大陆效应。模拟草食后，小叶青树表现出较强的再生能力，这种再生能力涉及植株生长、结构和分配的变化。去除75%的叶面积或所有抽苔茎使植株适合度分别降低到对照的81%和58%。没有迹象表明本地和引进的葱属植物种群在耐受性方面存在差异，也没有迹象表明耐受性和抗性之间存在权衡。
The European herb garlic mustard (Alliaria petiolata) is a serious invader of North American deciduous forests. One explanation for its success could be that in the absence of specialized herbivores, selection has favored less defended but more vigorous genotypes. This idea was addressed by comparing offspring from several native and introduced Alliaria populations with respect to their palatability to insect herbivores and their tolerance to simulated herbivory. Feeding rates of a specialist weevil from the native range were significantly greater on American plants, suggesting a loss of resistance in the introduced range. In contrast, there was significant population variation but no continent effect in the feeding rates of a generalist caterpillar. After simulated herbivory, A. petiolata showed a substantial regrowth capacity that involved changes in plant growth, architecture, and allocation. Removal of 75% leaf area or of all bolting stems reduced plant fitness to 81% and 58%, respectively, of the fitness of controls. There was no indication of a difference in tolerance between native and introduced Alliaria populations or of a trade-off between tolerance and resistance.