期刊
OECOLOGIA
卷 168, 期 2, 页码 471-481出版社
SPRINGER
DOI: 10.1007/s00442-011-2114-x
关键词
Iridoid glycosides; Constitutive defenses; Root:shoot ratios; Resource allocation; Root defenses
类别
资金
- Beverly Sears Graduate Student Grant
- Undergraduate Research Opportunity Program
- Department of Ecology and Evolutionary Biology at the University of Colorado
- National Science Foundation [DEB 0909717]
- Division Of Environmental Biology
- Direct For Biological Sciences [0909717] Funding Source: National Science Foundation
Numerous empirical studies have examined ontogenetic trajectories in plant defenses but only a few have explored the potential mechanisms underlying those patterns. Furthermore, most documented ontogenetic trajectories in plant defenses have generally concentrated on aboveground tissues; thus, our knowledge regarding whole plant trends in plant defenses throughout development or potential allocation constraints between growth and defenses is limited. Here, we document changes in plant biomass, nutritional quality and chemical defenses for below-and aboveground tissues across seven age classes of Plantago lanceolata (Plantaginaceae) to evaluate: (1) partial and whole plant ontogenetic trajectories in constitutive chemical defenses and nutritional quality, and (2) the role of resource allocation constraints, namely root: shoot (R:S) ratios, in explaining whole plant investment in chemical defenses over time. Overall investment in iridoid glycosides (IGs) significantly increased, while water and nitrogen concentrations in shoot tissues decreased with plant age. Significant variation in IG content between shoot and root tissues across development was observed: allocation of IGs into root tissues linearly increased from younger to older plants, while non-linear shifts in allocation of IGs during ontogeny were observed for shoot tissues. Finally, R: S ratios only weakly explained overall allocation of resources into defenses, with young stages showing a positive relationship, while older stages showed a negative relationship between R: S ratios and IG concentrations. Ontogenetic trajectories in plant quality and defenses within and among plant tissues can strongly influence insect herbivores' performance and/or predation risk; thus, they are likely to play a significant role in mediating species interactions.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据