Effects of High-Frequency Fluctuating Light on Photosynthe- sis and Production by Marine Macroalgae

高频脉动光对海洋大型藻类光合作用和生产的影响

• 批准号: 8716309
• 负责人: Valrie Gerard
• 金额: $ 12.14万
• 依托单位: SUNY at Stony Brook
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-10-15 至 1991-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8716309&HistoricalAwards=false
• 关键词: Effects; Frequency; Fluctuating; Light; Photosynthe

High-frequency (0.01-10 Hz) fluctuations are prominent characteristics of light in shallow, marine environments. High frequency fluctuations have been shown to have significant effects on photosynthesis and primary production by terrestrial plants and, more recently, by marine microalgae. The proposed research will examine effects of high-frequency light fluctuations on the photosynthetic physiology and productivity of the benthic macroalga, Chondrus crispus. Plants will be acclimated under a variety of constant and fluctuating irradiance, C-assimilation, and growth rates will be compared for the different treatments. The mechanisms of fluctuating light effects will be examined by comparing light-harvesting characteristics, carboxylating enzyme activity, light absorption kinetics, and pool sizes and turnover rates of metabolic substrates. Results of laboratory experiments will be related to environmental conditions by comparing responses of plants grown under different in situ light regimes. Overall, the proposed research will provide comprehensive information about effects of high-frequency fluctuations and response mechanisms in a marine alga from a light environment which is both highly variable and definable.

高频（0.01-10 Hz）波动显著 在浅海环境中的光的特性。 高 频率波动已被证明具有显著的 对光合作用和初级生产力的影响 植物和最近的海洋微藻。 拟议 研究将检验高频光的影响 光合生理和生产力的波动 底栖大型水生植物，角叉菜。 植物会被 在各种恒定和波动的环境下， 辐照度，C同化和生长率将进行比较， 不同的治疗。 光的波动机制 将通过比较光捕获 特性，羧化酶活性，光吸收 代谢动力学、代谢池的大小和周转率 印刷受体. 实验室实验的结果将与 通过比较植物生长的反应， 在不同的原位光照条件下。 总体而言，拟议 研究将提供有关影响的全面信息， 海洋中高频波动及其响应机制 从一个光环境，这是高度可变的， 可定义的