CONSTRUCTION COSTS, PAYBACK TIMES, AND THE LEAF ECONOMICS OF CARNIVOROUS PLANTS
CONSTRUCTION COSTS, PAYBACK TIMES, AND THE LEAF ECONOMICS OF CARNIVOROUS PLANTS
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DOI：
10.3732/ajb.0900054
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发表时间：
2009-09-01
影响因子：
3
通讯作者：
Ellison, Aaron M.
中科院分区：
文献类型：
--
作者：
Karagatzides, Jim D.;Ellison, Aaron M.
了解不同的植物物种和功能类型如何“投资”碳和养分是植物生态学家的主要目标。这种投资的两个衡量标准是“建设成本”（生产每克组织所需的碳）和光合作用收回建设成本的相关“回报时间”。这些测量整合用于评估叶性状的缩放关系的性状。食肉植物的模式系统研究叶性状协调机制，但没有研究同时测量的食肉陷阱的建设成本和光合速率，以确定回报时间的陷阱。我们测量了基于质量的建设成本（CCmass）和光合作用（A（质量））的陷阱，叶，根，和根茎的15个食肉植物品种在温室条件下生长。各结构的CCmass在种间差异极显著。肉食性陷阱的平均CCmass（1.14 +/- 0.24 g葡萄糖/g干质量）显著低于267种非肉食性植物物种的叶片CCmass（1.47 +/- 0.17），但所有被检测的肉食性植物具有非常低的A（质量），因此具有长的回收期（495-1551 h）。我们的研究结果提供了第一个明确的估计植物食肉动物的边际效益和地方食肉植物在“缓慢而坚韧”的结束叶性状的普遍频谱。
Understanding how different plant species and functional types "invest" carbon and nutrients is a major goal of plant ecologists. Two measures of such investments are "construction costs" (carbon needed to produce each gram of tissue) and associated "payback times" for photosynthesis to recover construction costs. These measurements integrate among traits used to assess leaf-trait scaling relationships. Carnivorous plants are model systems for examining mechanisms of leaf-trait coordination, but no studies have measured simultaneously construction costs of carnivorous traps and their photosynthetic rates to determine payback times of traps. We measured mass-based construction costs (CCmass) and photosynthesis (A(mass)) for traps, leaves, roots, and rhizomes of 15 carnivorous plant species grown under greenhouse conditions. There were highly significant differences among species in CCmass for each structure. Mean CCmass of carnivorous traps (1.14 +/- 0.24 g glucose/g dry mass) was significantly lower than CCmass of leaves of 267 noncarnivorous plant species (1.47 +/- 0.17), but all carnivorous plants examined had very low A(mass) and thus, long payback times (495-1551 h). Our results provide the first clear estimates of the marginal benefits of botanical carnivory and place carnivorous plants at the "slow and tough" end of the universal spectrum of leaf traits.