On a Dynamic Balance Theory of Photosynthetic Pigment Regulation in Unicellular Algae: Tests of a Novel Hypothesis

P.I.作者：KANA，托德M. 提案编号：96-33633 单细胞藻类光合色素调节的动态平衡理论：一个新假设的检验 摘要 微藻光合色素的环境控制被假设为依赖于一个简单的 控制机构 围绕光系统运转 II 动力学 光合色素的光适应机制已经困扰了研究者50多年。 根据光合机构在恒定和波动环境中的一般行为，提出了光适应的“动态平衡”理论。这一新理论首次解释了色素浓度如何在广泛的光、营养和温度环境下得到优化。 本研究将直接检验动平衡理论。 四种分类学上不同的微藻物种 都是调查的目标不同的光适应条件下的控制生长实验将提供有关光合反应，色素沉着，和光系统II动力学的基础。预计对该理论的实验支持将导致结合其他已知光合调节机制的模型的发展，从而产生更普遍的 光合作用限制的认识 以及光合生物的能量平衡机制。

P.I. : KANA, Todd M. Proposal No: 96-33633 Title: On a Dynamic Balance Theory of Photosynthetic Pigment Regulation in Unicellular Algae: Tests of a Novel Hypothesis ABSTRACT Environmental control of photosynthetic pigmentation in microalgae is hypothesized to depend on a simple control mechanism operating around photosystem II dynamics. The mechanisms responsible for photoacclimation of photosynthetic pigments have eluded researchers for more than 5 decades. A "dynamic balance" theory of photoacclimation is described based on general behavior of the photosynthetic apparatus in constant and fluctuating environments. This novel theory is the first to explain how pigment concentrations are optimized over a broad range of light, nutrient, and temperature environments. The proposed research will directly test the dynamic balance theory. Four taxonomically diverse microalgal species are targeted for investigations. Controlled growth experiments under differing photoacclimative conditions will provide a basis for relating photosynthetic response, pigmentation, and photosystem II dynamics. It is anticipated that experimental support for the theory will lead to the development of models combining other known photosynthetic regulatory mechanisms, resulting in a more general appreciation of constraints on photosynthesis and mechanisms of energy balance in photosynthetic organisms.