Photosynthetic Responses of Plants to Excess Light: Mechanisms and Conditions for Photoinhibition, Excess Energy Dissipation and Repair

摘要: Plants as sessile organisms must be capable of rapidly coping with changes in environmental conditions. In nature light is the most variable parameter. During day, plants deal several orders magnitude quantity but also quality take place. Light an absolute prerequisite for photosynthesis energy source; however, excess can harmful and lead to a destruction photosynthetic apparatus. Photoinhibition has been defined light-dependent decline efficiency result absorption light. However, strong consensus still missing concerning term photoinhibition whether it describes decrease due photodamage thereby reduction population functional photosystems or regulatory adjustments, like reduced transfer from antenna reaction centers both these processes. Diurnal common phenomenon exposed direct sunlight. Depending on season diurnal cycle, have developed various adaptation systems cope highly, well frequently, changing intensity quality. Although number mechanisms evolved dissipate absorbed by harmless pathways, apparatus remains fragile system vulnerable damage This chapter briefly plant response stress. this chapter, we used describe process that finally leads repair centers, while dissipative processes are regarded sole photoprotective