Differential responses of invasive Celastrus orbiculatus (Celastraceae) and native C. scandens to changes in light quality.
Differential responses of invasive Celastrus orbiculatus (Celastraceae) and native C. scandens to changes in light quality.
复制标题
入侵性南蛇藤（南蛇藤科）和本地南蛇藤对光质量变化的不同反应。
DOI：
10.3732/ajb.93.7.972
复制
发表时间：
2006
影响因子：
3
通讯作者：
J. Silander
中科院分区：
文献类型：
--
作者：
Stacey A. Leicht;J. Silander
当植物受到森林下层或邻近植物的叶冠遮荫时，它们不仅会感受到光量的减少，而且会降低红色：远红光（R：FR）的光质量。在 R : FR 降低的情况下，植物的生长和其他发育反应可能会有所不同，并且在不同物种之间并不一致。我们比较了入侵性藤本植物（Celastrus orbiculatus）及其密切相关的本地同源植物 C. scandens 在受控的模拟林下条件下如何响应 R : FR 的变化。我们在控制、中性阴影和低 R : FR 光处理下测量了一系列形态和生长属性。与中性遮荫相比，减少 R : FR 处理的南蛇藤显示出高度、地上生物量和总叶质量的增加，而 C. scandens 的茎直径、单叶面积和叶质量与茎质量之比增加。这些差异提供了对 C. orbiculatus 增加高度和在森林下层积极寻找光资源的能力的机械理解，而 C. scandens 似乎无法寻找光，而是依赖于光间隙的形成。 C. orbiculatus 在遮荫条件下的塑性生长反应表明它在几乎不存在 C. scandens 的森林栖息地中取得了成功。
When plants are subjected to leaf canopy shade in forest understories or from neighboring plants, they not only experience reduced light quantity, but light quality in lowered red : far red light (R : FR). Growth and other developmental responses of plants in reduced R : FR can vary and are not consistent across species. We compared how an invasive liana, Celastrus orbiculatus, and its closely related native congener, C. scandens, responded to changes in the R : FR under controlled, simulated understory conditions. We measured a suite of morphological and growth attributes under control, neutral shading, and low R : FR light treatments. Celastrus orbiculatus showed an increase in height, aboveground biomass, and total leaf mass in reduced R : FR treatments as compared to the neutral shade, while C. scandens had increased stem diameter, single leaf area, and leaf mass to stem mass ratio. These differences provide a mechanistic understanding of the ability of C. orbiculatus to increase height and actively forage for light resources in forest understories, while C. scandens appears unable to forage for light and instead depends upon a light gap forming. The plastic growth response of C. orbiculatus in shaded conditions points to its success in forested habitats where C. scandens is largely absent.