套袋对番茄果实表面光系统Ⅱ光能吸收利用的影响  

Effects of bagging on light use efficiency of tomato fruit photosystem Ⅱ.

作　　者：王梅[1] 高志奎[1] 薛占军[2] 

机构地区：[1]河北农业大学园艺学院,河北保定071001 [2]河北农业大学资源与环境科学学院,河北保定071001

出　　处：《应用生态学报》2010年第9期2329-2334,共6页Chinese Journal of Applied Ecology

基　　金：河北省"十一五"科技支撑计划项目(07220701D);河北省科技计划项目(09230907D)资助

摘　　要：用白纸淋膜袋对温室番茄‘保罗塔’果实进行套袋处理,采用光纤光谱仪和叶绿素成像荧光仪测定了番茄果实的吸收光谱和叶绿素荧光参数,分析了套袋对番茄果实光系统Ⅱ光能利用效率的影响.结果表明:在套袋后的前20 d内,与对照(CK)相比,套袋果实表面的叶绿素a(Chl a)含量和光系统Ⅱ最大光化学效率(Fv/Fm)无明显变化,但是套袋降低了果实表面的相对吸光系数A670/780和光系统Ⅱ实际光化学效率(YⅡ),此时番茄果实主要以PSⅡ调节性能量耗散机制为主.随后,番茄果实表面的Chl a和Chl b含量开始明显下降,但是套袋果实的Fv/Fm、YⅡ和A670/780与CK无显著差异.在套袋后的第40天,套袋果实表面的Chl a和Chl b含量分别比CK降低了35.2%和52.8%,Fv/Fm和YⅡ仍然维持较高水平,分别比CK增加了24.5%和35.4%,表明此时番茄果实PSⅡ具有较高的光能利用效率,通过进一步降低非调节性能量耗散量子产额YNO为果实的早熟奠定了能量基础.In a greenhouse experiment,white laminating bags were applied to bag the tomato cultivar ＇Baoluota＇ fruits,with the absorption spectra and chlorophyll fluorescence parameters of the fruits measured by optical spectrometer and Mini-Imaging-Pam after different bagging time,aimed to investigate the effects of bagging on the light use efficiency of photosystem Ⅱ of the fruits.In the first 20 days of bagging,no significant effects of bagging were observed on the chlorophyll a（Chl a） content and the maximum quantum yield of PSⅡ（Fv/Fm） of the fruits,but the relative absorption coefficient（A670/780） and the effective quantum yield of PS Ⅱ（YⅡ） were reduced,compared with the control.In this period,the regulatory energy dissipation of PSⅡ played an important role.After then,the Chl a and Chl b contents of bagged fruits decreased markedly,but the Fv/Fm,YⅡ,and A670/780 had no significant differences with the control.On the 40th day of bagging,the Chl a and Chl b contents of bagged fruits decreased by 35.2% and 52.8%,but the Fv/Fm and YⅡ increased by 24.5% and 35.4%,respectively,suggesting that at this time,the PSⅡ of bagged tomato fruits had a higher light use efficiency,which provided energy foundation for the earlier ripening of the bagged fruits via further reducing the quantum yield of non-regulatory energy dissipation（YNO）.

关 键 词：番茄果实 套袋 吸收光谱 叶绿素荧光 光化学效率 

分 类 号：S641.2[农业科学—蔬菜学]