低夜温后不同光强对榕树叶片PSII功能和光能分配的影响  

Effects of different light intensity after low night temperature stress on PSII functions and absorbed light allocation in leaves of Ficus microcarpa

作　　者：胡文海[1] 肖宜安[1] 喻景权[2] 黄黎锋[2] 

机构地区：[1]井冈山师范学院生命科学系,吉安343009 [2]浙江大学园艺系,杭州310029

出　　处：《植物研究》2005年第2期159-162,共4页Bulletin of Botanical Research

摘　　要：研究了自然低夜温后全光照与遮荫对榕树叶片PSII功能及光能分配的影响。结果表明低夜温后全光照条件下叶片吸收光能分配于光化学反应部分减少,而热耗散部分和反应中心过剩光能则增加,从而导致了PSII功能的下降,遮荫条件下光能分配于光化学反应的程度增加,虽然用于热耗散的比例下降了,但反应中心过剩光能相对较少,从而有利于PSII功能的恢复。In this study, the effects of full sunlight and shade after natural low night temperature on PSII functions and light allocation in leaves of Ficus microcarpa was examined. Under full sunlight after low night temperature, the allocation of light absorbed by PSII antennae to the photochemical reaction decreased, but the allocation of absorbed light to thermal dissipation and excessive energy increased. So it resulted the decrease of the PSII functions. Though the allocation of absorbed light to thermal dissipation decreased, shade after low night temperature can decrease excessive energy of PSII reaction centers by increase of fraction of light absorbed in PSII antennae that was utilized in PSII photochemistry, and protect the photosynthetic apparatus not to be injured. So shade after low night temperature was beneficial to recover PSII functions.

关 键 词：PSⅡ功能 光能分配 叶片 夜温 榕树 光化学反应 光强 反应中心 光照条件 遮荫条件 热耗散 全光照 部分和 过剩 下降 

分 类 号：S792.110.1[农业科学—林木遗传育种] S511[农业科学—林学]