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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.
The bagging of greenhouse tomato ’Paolo’ was bagged in white paper-coated bags. The absorption spectra and chlorophyll fluorescence parameters of tomato fruits were determined by using optical fiber spectrometer and chlorophyll fluorescence imaging instrument. The results showed that the content of chlorophyll a (Chl a) and the maximum photochemical efficiency (Fv / Fm) of photosystemⅡ in the bagged fruits were significantly increased in the first 20 days after bagging compared with CK (CK) However, bagging reduced the relative extinction coefficient (A670 / 780) of the fruit surface and the actual photochemical efficiency (YII) of the photosystem Ⅱ, at this time, the tomato fruits mainly dominated by PSⅡregulatory energy dissipation mechanism, The contents of Chl a and Chl b began to decline obviously, but the Fv / Fm, YⅡ and A670 / 780 of bagged fruits were not significantly different from CK. On the 40th day after bagging, the contents of Chl a and Chl b Respectively, decreased by 35.2% and 52.8%, respectively. CK, Fv / Fm and YⅡ remained higher than that of CK by 24.5% and 35.4% respectively, indicating that PSⅡ of tomato fruits had a higher light energy use efficiency. Reduce non-regulatory energy dissipation quantum The amount of energy YNO laid the foundation for the precocious fruit.