Effect of photoinhibition on algal photosynthesis: a dynamic model
Effect of photoinhibition on algal photosynthesis: a dynamic model
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DOI：
10.1093/plankt/22.5.865
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发表时间：
2000-05-01
影响因子：
2.1
通讯作者：
Straskraba, M
中科院分区：
文献类型：
--
作者：
Han, BP;Virtanen, M;Straskraba, M
来自藻类生理和分子生物学的最新证据证实，光抑制与D1蛋白的损伤和修复直接相关，而D1蛋白的损伤会导致电子转移减少或电子转移链周转时间增加。在这项研究中，电子转移链的周转时间被定义为反应中心II中D1蛋白相对浓度的函数，并且由Dubinsky等人发起的光合作用模型中包含了由于D1蛋白降解而导致的光抑制过程。(植物细胞生理，27,1335-1349。1986)，由Sakshaug等人开发。(利姆诺尔)海洋，34,198-205,1989)。D_1蛋白损伤被认为是光和D_1蛋白浓度依赖的，并且与PSII的横截面(Sigma(PSII))成正比。D_1蛋白回收率仅依赖于D_1蛋白浓度。引入损伤常数(k(D))和恢复速率(k(R))两个参数来描述d1蛋白浓度的动态变化。设定最小周转时间tau(M)=3ms，最大量子产率Phi(M)=0.1molO-2E-1，光学截面a*=0.0075 m(2)(Mg CHa)(-1)，sigma(PSII)=2 nm(2)，k(D)0~10(-7)和k(R)=0.55h(-1)，模拟了自然条件下光抑制对光合作用的动态影响。模拟结果与观测值基本一致。通过这个动力学模型，研究了与光抑制相关的光合作用的某些方面，如营养限制以及光抑制和光适应之间的相互作用。
Recent evidence from algal physiology and molecular biology confirms that photoinhibition is directly related to D1 protein damage and recovery, and D1 protein damage leads to a decrease in electron transfer or an increase in turnover time of the electron transfer chain. In this study, the turnover time of the electron transfer chain is defined as a function of the relative concentration of D1 protein in reaction centre II and the photoinhibition processes due to D1 protein degradation are incorporated into a model of photosynthesis, initiated by Dubinsky et al. (Plant Cell Physiol., 27, 1335-1349. 1986) and developed by Sakshaug et al. (Limnol. Oceanogr., 34, 198-205, 1989). D1 protein damage is assumed to be both Light and D1 protein concentration dependent, and to be proportional to the cross-section of PSII (sigma(PSII)). D1 protein recovery is only D1 protein concentration dependent. Two parameters, the damage constant (k(d)) and recovery rate (k(r)), are introduced to formulate the dynamics of D1 protein concentration. Setting minimal turnover time tau(m) = 3 ms, maximal quantum yield phi(m) = 0.1 mol O-2 E-1, optical cross-section a* = 0.0075 m(2) (mg Chi a)(-1), sigma(PSII) = 2 nm(2), k(d) ranging from 0 to 10(-7) and k(r) = 0.55 h(-1), the dynamic effect of photoinhibition on photosynthesis in natural conditions is simulated. Simulation results are consistent with observations. Some aspects of photosynthesis associated with photoinhibition, e.g. nutrient limitation and the interaction between photoinhibition and photoadaptation, are investigated through this dynamic model.