Key Laboratory of Tropical Forest Ecology, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China.
J Plant Physiol. 2012 Jun 15;169(9):884-91. doi: 10.1016/j.jplph.2012.02.011. Epub 2012 Apr 1.
To explore the traits contributing to invasiveness of Eupatorium adenophorum and to test the relationship between plasticity of these traits and invasiveness, we compared E. adenophorum with its two native congeners at four irradiances (10%, 23%, 40%, and 100%). The invader showed constantly higher performance (relative growth rate and total biomass) across irradiances than its native congeners. Higher light-saturated photosynthetic rate (P(max)), respiration efficiency (RE), and nitrogen (PNUE) and water (WUE, at 40% and 100% irradiances only) use efficiencies contributed directly to the higher performance of the invader. Higher nitrogen allocation to, stomatal conductance, and the higher contents of leaf nitrogen and pigments contributed to the higher performance of the invader indirectly through increasing P(max), RE, PNUE and WUE. The invader had consistently higher plasticity only in carotenoid content than its native congeners in ranges of low (10-40%), high (40-100%) and total (10-100%) irradiances, contributing to invasion success in high irradiance by photo protection. In the range of low irradiances, the invader had higher plasticity in some physiological traits (leaf nitrogen content, nitrogen contents in bioenergetics, carboxylation and in light-harvesting components, and contents of leaf chlorophylls and carotenoids) but not in performance, while in the ranges of high or total irradiances, the invader did not show higher plasticity in any variable (except Car). The results indicated that the relationship between invasiveness and plasticity of a specific trait was complex, and that a universal generalization about the relationship might be too simplistic.
为了探究紫茎泽兰入侵性的特征，并检验这些特征的可塑性与其入侵性之间的关系，我们在四个光照强度（10%、23%、40%和 100%）下，将紫茎泽兰与其两个同属近缘种进行了比较。与同属近缘种相比，入侵种在各个光照强度下的表现（相对生长率和总生物量）始终更高。较高的光饱和光合速率（P(max)）、呼吸效率（RE）以及氮（PNUE）和水（仅在 40%和 100%光照强度下的 WUE）利用效率直接导致了入侵种更高的表现。较高的氮分配到、气孔导度以及叶片氮和色素含量的增加，通过增加 P(max)、RE、PNUE 和 WUE，间接导致了入侵种更高的表现。与同属近缘种相比，入侵种在低（10-40%）、高（40-100%）和总（10-100%）光照强度范围内，类胡萝卜素含量的可塑性始终更高，这有助于其在高光强下通过光保护获得入侵成功。在低光照强度范围内，入侵种在一些生理特征（叶片氮含量、生物能学中的氮含量、羧化作用以及光捕获成分中的氮含量以及叶片叶绿素和类胡萝卜素含量）方面具有更高的可塑性，但在性能方面则没有，而在高光照强度或总光照强度范围内，入侵种在任何变量（除了 Car）方面都没有表现出更高的可塑性。结果表明，入侵性与特定特征的可塑性之间的关系是复杂的，关于这种关系的普遍概括可能过于简单化。
