A quicker return energy-use strategy by populations of a subtropical invader in the non-native range: a potential mechanism for the evolution of increased competitive ability
A quicker return energy-use strategy by populations of a subtropical invader in the non-native range: a potential mechanism for the evolution of increased competitive ability
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非本地亚热带入侵者种群更快地恢复能源利用策略：增强竞争力的潜在机制
DOI：
10.1111/j.1365-2745.2011.01843.x
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发表时间：
2011-09-01
影响因子：
5.5
通讯作者：
Inderjit
中科院分区：
文献类型：
--
作者：
Feng, Yu-Long;Li, Yang-Ping;Inderjit
1.许多研究测试的进化增加竞争能力假说集中在是否植物入侵种群的一个物种显示减少分配到防御和增加分配到生长比植物从本地种群。但很少有人试图了解减少对防御的分配可能会增加生长的生理生态机制。在此之前，我们发现，入侵胜红蓟植物增加氮分配光合作用和减少分配到细胞壁相比，本地胜红蓟植物，这表明从防御到增长的入侵种群的转变。在这里，进行这项工作，我们测量了建设成本和效益与光合作用在光饱和到叶子。我们推测，入侵的胜红蓟种群可能通过提高光饱和光合速率和光合能量利用效率（PEUE）以及降低叶片构建成本来采用更快的能量利用策略.从入侵种群（中国和印度）的快速增长的植物有显着较高的叶片氮浓度和比叶面积比本地种群（墨西哥）的植物。与我们的预测不一致的是，入侵种群和本地种群的叶片构建成本没有显著差异，但较高的光饱和光合速率和较高的PEUE导致构建成本的投资回收期显著缩短，这使得入侵种群的植物生长得更快。合成.我们的研究结果表明，胜红蓟属植物的种群在非本地范围内有一个独特的快速返回能源使用策略，高PEUE和投资回收期短，但不降低建设成本，这可能提供了一个机械的解释，通常观察到的增长时，植物被引入到世界的新的部分。据我们所知，这是第一个研究，以比较能源使用策略的植物入侵和本地种群的有害入侵物种。我们不能排除这些模式的一些替代假设，如创始人的影响，但这些生态生理差异可能提供机制的见解如何减少分配到国防的演变可能会增加增长和竞争能力。
1. Many studies testing the evolution of increased competitive ability hypothesis have focused on whether plants from invasive populations of a species show reduced allocation to defence and increased allocation to growth than plants from native populations. But few have attempted to understand ecophysiological mechanisms by which decreased allocation to defence may increase growth.2. Previously, we found that invasive Ageratina adenophora plants increase nitrogen allocation to photosynthesis and reduce allocation to cell walls compared with native Ageratina plants, suggesting a shift from defence to growth in invasive populations. Here, carrying this work forward, we measured construction costs and benefits associated with photosynthesis at light saturation to leaves. We hypothesized that invasive Ageratina populations might employ a quicker return energy-use strategy by increasing light-saturated photosynthetic rates and photosynthetic energy-use efficiency (PEUE) and by decreasing leaf construction costs.3. Faster-growing plants from invasive populations (China and India) had significantly higher leaf nitrogen concentrations and specific leaf areas than plants from native populations (Mexico). Inconsistent with our prediction, leaf construction costs were not significantly different between plants from invasive and native populations, but higher light-saturated photosynthetic rates and in turn higher PEUE resulted in a significantly shorter payback time of construction costs, which allowed plants from invasive populations to grow faster.4. Synthesis. Our results indicate that Ageratina plants from populations in non-native ranges have a distinct quick return energy-use strategy, a high PEUE and a short payback time but not lower construction costs, which might provide a mechanistic explanation for the commonly observed increase in growth when plants are introduced to new parts of the world. To our knowledge, this is the first study to compare energy-use strategy for plants from invasive and native populations of a noxious invasive species. We cannot exclude some alternative hypotheses for these patterns, such as founder effects, but these ecophysiological differences might provide mechanistic insight for how the evolution of decreased allocation to defence may increase growth and competitive ability.