Geographical diversification of growth-defense strategies in an invasive plant
Geographical diversification of growth-defense strategies in an invasive plant
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入侵植物生长防御策略的地理多样化
DOI：
10.1111/j.1759-6831.2012.00239.x
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发表时间：
2013-05-01
影响因子：
3.7
通讯作者：
Li, Bo
中科院分区：
文献类型：
--
作者：
Pan, Xiao-Yun;Jia, Xin;Li, Bo
食草动物压力和资源可利用性之间的相互作用可能会导致植物的生长-防御权衡（资源可利用性假说），这促进了生态多样化的潜力，最近被提出作为一种新的植物入侵机制（资源-敌人释放假说）。在本研究中，我们测试了这一想法，通过比较模式的最大增长率和抗草食动物防御能力对Agasicles hygrophila（一个专门的植食性昆虫空心莲子草philoxeroides）之间的6个变种。来自本土（阿根廷）和引进（美国和中国）的空心莲子草。结果表明，植食性抗性与A.空心莲子草与阿根廷本土变种相比，引进变种一般表现出更高的生长速度和更低的防御力。结果表明，蚤甲压力和资源可利用性的共同作用促进了中华绒螯蟹的地理分化。philoxeroides，从自然专家和增加资源可用性的释放可能相互作用，有助于其成功入侵。
Interactions between herbivore pressure and resource availability may result in growth-defense trade-offs in plants (resource availability hypothesis), which promote the potential for ecological diversification and have recently been proposed as a new mechanism of plant invasion (resource-enemy release hypothesis). In the present study, we tested this idea by comparing patterns of maximum growth rate and antiherbivore defense capacity against Agasicles hygrophila (a specialist phytophagous insect on Alternanthera philoxeroides) among six morphs of A. philoxeroides from both native (Argentina) and introduced (US and China) ranges. The results revealed that herbivore resistance consistently exhibited a significant trade-off against the growth rate of A. philoxeroides. Compared with native morphs in Argentina, introduced morphs generally exhibited a higher growth rate and lower defense. The results demonstrate that the combination of flea beetle pressure and resource availability facilitates geographical divergence of A. philoxeroides, and that release from natural specialists and increased resource availability may interact to contribute to its successful invasion.