Efficiency of Photosystem II and Carbon Assimilation in C4 Plants

9317756爱德华兹光合作用由两个一般过程组成：一个是将太阳能转化为高能中间体，另一个是利用这些高能中间体驱动热力学上不利的反应，从而将无机物转化为有机物。各种过程的效率可以在三个不同的水平上考虑：太阳能的吸收，太阳能在光化学中的利用，以及利用光化学衍生的能量进行碳同化。叶绿素对太阳能的吸收导致了光系统II中强还原剂的形成和水的氧化。通过利用调制光对叶绿素荧光的分析，可以从碳固定和氧的光合作用释放两方面来评价光系统II对太阳能的利用效率。在这个项目中，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植物的光系统II活性汇和碳同化中还原力的利用效率。***

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. ***