Abstract:

When planks absorb more light than that can be used for photosynthesis, the excessive energy can cause photooxidation and even photooxidation of photosynthetic apparatus. Xanthophyll cycle-dependent photo-protection is believed to be the main mechanism for plants to deal with excessive light energy. This review focuses on molecular biological aspects and regulations of violaxanthin de-epoxidase and zeaxanthin epoxidase involved in xanthophyll cycle. We will summarize the functions of xanthophyll cycle, especially recent advances in its thermal dissipation mechanism of photoprotection. Some interesting issues deserving further study will be discussed.

叶黄素循环及其在光保护中的分子机理研究

林荣呈  许长成  李良璧^*  匡廷云

(中国科学院植物研究所光合作用基础研究开放实验室,北京,100093)

植物的生命活动离不开充足的光照,但是当光照过强时,叶片吸收的光能超过了光合电子传递所需,过剩的光能便会对光合器官产生潜在的危害,引起光合作用的光抑制或光破坏.依赖于叶黄素循环的热耗散被认为是光保护的主要途径.本文着重介绍近年来有关植物叶黄素循环在酶学方面的分子调控、它的主要功能以及依赖于叶黄素循环的热耗散在光保护中的分子机理等,并对需进一步研究的问题作了探讨.

关键词 叶黄素循环 紫黄质脱环氧化酶 热耗散 光保护

*通讯作者 Email: lbli@ns.ibcas.ac.cn

Key words: xanthophyll cycle, violaxanthin de-epexidase, thermal dissipation, photoprotection