Efficiency of Photosystem II and Carbon Assimilation in C4 Plants

C4 植物光系统 II 和碳同化的效率

• 批准号: 9317756
• 负责人: Gerald Edwards
• 金额: --
• 依托单位: Washington State University
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1994
• 资助国家: 美国
• 起止时间: 1994-08-01 至 1999-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9317756&HistoricalAwards=false
• 关键词: Efficiency; Photosystem; II; Carbon; Assimilation

9317756 Edwards Photosynthesis is composed of two general processes: one, the conversion of solar energy into high energy intermediates, and the other, the use of those high energy intermediates to drive thermodynamically unfavorable reactions, which results in the conversion of inorganic matter to organic matter. The efficiency of the various processes can be considered at three different levels: the absorption of solar energy, the utilization of solar energy in photochemistry, and the utilization of photochemically derived energy for carbon assimilation. Absorption of solar energy by chlorophyll results in the formation of a strong reductant and the oxidation of water at photosystem II. From analyses of chlorophyll fluorescence using modulated light, the efficiency of utilization of solar energy by photosystem II can be evaluated with respect to carbon fixation and photosynthetic evolution of oxygen. In this project, analyses will be made at the whole plant and cellular level to determine sinks for photosystem II activity and the efficiency of utilization of reductive power in carbon assimilation in C4 plant species, which have a carbon dioxide concentrating mechanism. ***

9317756 Edwards 光合作用由两个一般过程组成：一是将太阳能转化为高能中间体，二是利用这些高能中间体驱动热力学不利的反应，从而导致无机物转化为有机物。各种过程的效率可以在三个不同的层面上考虑：太阳能的吸收、太阳能在光化学中的利用以及光化学衍生能量用于碳同化的利用。叶绿素吸收太阳能导致强还原剂的形成和光系统 II 中水的氧化。通过使用调制光对叶绿素荧光进行分析，可以在碳固定和光合作用释氧方面评估光系统 II 对太阳能的利用效率。在该项目中，将在整个植物和细胞水平上进行分析，以确定具有二氧化碳浓缩机制的C4植物物种的光系统II活性库以及碳同化中还原力的利用效率。 ***