低温弱光胁迫对日光温室栽培杏树光系统功能的影响  

Effects of low temperature and weak light on the functions of photosystem in Prunus armeniaca L. leaves in solar greenhouse

作　　者：孙山[1] 张立涛[2] 王家喜[1] 王少敏[1] 高华君[1] 高辉远[2] 

机构地区：[1]山东省果树研究所,山东泰安271000 [2]山东农业大学生命科学学院,山东泰安271018

出　　处：《应用生态学报》2008年第3期512-516,共5页Chinese Journal of Applied Ecology

基　　金：国家自然科学基金项目(30671451);高校博士点专项基金资助项目(20050434007)

摘　　要：以温室栽培的金太阳杏为材料,测定了金太阳杏叶片光合速率(Pn)、光系统Ⅱ(PSⅡ)光下实际光化学效率(ΦPSⅡ)、光化学猝灭系数(qP)和开放的PSⅡ反应中心的激发能捕获效率(Fv′/Fm′),探讨了低温弱光(7℃、200μmol.m-2.s-1PFD)对叶片光系统Ⅰ(PSⅠ)和PSⅡ的抑制作用.结果表明:温室栽培的金太阳杏叶光合作用的最适温度在25℃左右.光下7℃的低温可使叶片净光合速率(Pn)大幅下降,造成激发压(1-qP)增大,进而引起光抑制.低温弱光条件使PSⅠ和PSⅡ功能受到破坏,与单纯低温胁迫(7℃,黑暗)处理相比,经低温、弱光(7℃,200μmol.m-2.s-1PFD)胁迫2h后,PSⅠ活性下降了28.26%,而PSⅡ最大光化学效率(Fv/Fm)没有发生显著变化,表明低温弱光条件下PSⅠ比PSⅡ更易发生光抑制.In this paper, the net photosynthetic rate （ Pn ）, actual photochemical efficiency of PS Ⅱ （ΦPSⅡ）, photochemical quenching（qv）, and maximal photochemical efficiency of PSⅡ in light （Fv′/Fm′） of apricot （Prunus armeniaca ） leaves in solar greenhouse were measured, and the effects of low temperature （7℃ ） and weak light （200μmol·m^-2·s^-1 PFD） on the photoinhibition of PSI and PS Ⅱ were investigated. The results showed that the optimal temperature for the photosynthesis of apricot leaves was around 25℃, and the photosynthetic capacity was reduced greatly by the low temperature and weak light, inducing a markedly increased excitation press （ 1 - qv ） and in turn, resulting in photoinhibition. The functions of both PSI and PS Ⅱ were damaged by the low temperature and weak light. Comparing with those only subjected to low temperature, the leaves subjected to both low temperature and weak light had a decreased activity of PSI , with a decrement of 28.26% within 2 h, but their maximal photochemical effeciency of PS Ⅱ （ Fv/Fm） had little change in the same period, suggesting that under low temperature and weak light, PS Ⅰ was more suffered from photoinhibition than PS Ⅱ.

关 键 词：低温弱光 日光温室 杏 光系统 

分 类 号：S662.2[农业科学—果树学] S628[农业科学—园艺学]