Collaborative Research: Consequences of Leaf Lifetime for Photosynthetic Physiology, Secondary Metabolism, and Anatomyin Tropical Plants

合作研究：叶寿命对热带植物光合生理学、次生代谢和解剖学的影响

• 批准号: 8806080
• 负责人: Phyllis Coley
• 金额: $ 18.94万
• 依托单位: University of Utah
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1989
• 资助国家: 美国
• 起止时间: 1989-03-15 至 1992-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8806080&HistoricalAwards=false
• 关键词: Collaborative; Research; Consequences; Leaf; Lifetime

Much recent work has focused on the dynamic nature of the abiotic environment, and on the ways plants respond to these changing conditions. In particular, emphasis has been placed on the importance of variation in light availability for two fundamental aspects of plant performance: growth and defense. However, our understanding of light effects on photosynthesis and synthesis of defensive secondary metabolites comes primarily from temperate high light environments and agricultural systems. In humid tropical forests, light availability at the forest floor is extremely low (1% full sunlight), with periods of higher light lasting from seconds to hours, depending on the size of the opening in the canopy above. Tree saplings and understory plants must therefore be capable of persisting at extremely low light levels, yet be able to take advantage of short periods of intense and perhaps damaging light. Little is known about how these shade-tolerant species adjust to long-and short-term variation in light availability, despite the fact the majority of the world's species exists under these conditions. The investigators will collect comparative data on photosynthetic physiology, secondary metabolites, and leaf anatomy for a range of shade-tolerant tropical woody species. This will enable them to assess the physiological mechanisms underlying adjustments to long-and short-term variation in light availability, and to track how resources are differentially allocated to growth vs defense.

最近的许多工作都集中在动态性质的 非生物环境，以及植物对这些环境的反应方式 不断变化的条件 特别强调的是， 两个人的光照变化的重要性 植物性能的基本方面：生长和防御。 然而，我们对光对光合作用的影响的理解， 防御性次级代谢产物的合成主要来自 温带高光环境和农业系统。 在 潮湿的热带森林，森林地面的光可用性是 极低（1%全日照），有较高光照的时期 持续时间从几秒钟到几小时，取决于 在上面的树冠上打开。 树苗和林下植物 因此必须能够在极低的光照下持续存在 水平，但能够利用短期的激烈 也许还有有害的光 我们对这些人是如何 耐荫物种适应长期和短期的变化， 光的可用性，尽管事实上，世界上大多数 物种在这种条件下生存。 研究人员将收集以下方面的比较数据： 光合生理、次生代谢产物和叶片 一系列耐荫热带木本植物的解剖学。 这将使他们能够评估生理机制 长期和短期变化的基本调整 可用性，并跟踪资源的差异 分配给增长与防御。