Abstract:

The protective role of xanthophyll cycle in resurrection angiosperm Boea hygrometrica (Bunge) R.Br. was investigated by analysis of the changes of chlorophyll fluorescence and xanthophyll cycle components in response to dehydration and rehydration in detached leaves under very weak light condition (3 μmol photons·m-2·s-1) and in the dark. With declines in the values of PSⅡ photochemical efficiency (Fv/Fm), PSⅡ actual quantum yield (ΦPSⅡ), photochemical quenching (qP) and non-photochemical quenching (NPQ) during dehydration, zeaxanthin significantly increased in control Boea leaves under very weak light condition, while no zeaxanthin accumulation was detected in Boea leaves treated with dithiothreitol (DTT) and Boea leaves in the dark, and after 3 d rehydration, the parameters Fv/Fm,ΦPSⅡ, qP and NPQ showed full recovery in control Boea leaves under very weak light condition, but the parameters only underwent partial recovery in Boea leaves treated with DTT and Boea leaves in the dark, suggesting that the recovery of photosystemⅡ (PSⅡ) photochemical activities in Boea leaves was obviously affected by treatments with DTT and darkness, therefore, zeaxanthin may play an important protective role in desiccated Boea leaves even under very weak light conditions. Key words: chlorophyll fluorescence; desiccation; resurrection angiosperm; xanthophyllcycle

复苏被子植物牛耳草脱水和复水期间叶黄素循环的保护作用
阳文龙 胡志昂  王洪新  单际修 匡廷云

（1. 中国科学院植物研究所，北京100093；2.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）