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以温室嫁接黄瓜为试材,研究不同光照强度和CO2浓度互作条件下叶片净光合速率和叶绿素荧光参数日变化规律及其相互关系,旨在为温室嫁接黄瓜高产优质栽培提供参考依据。结果表明:相对100%光照下叶片净光合速率(Pn)、光化学猝灭(qP)的日变化均呈双峰曲线,相对15%光照和32%光照处理的日变化均为单峰曲线,说明适当遮阴可以有效缓解温室黄瓜光合“午休”现象;相对100%光照+高浓度CO2处理组合的净光合速率(Pn)值最大,可以有效提高黄瓜叶片的光合效率,为光强和CO2浓度的较优组合;相对32%光照下施加中浓度CO2的处理组合叶绿素荧光参数Fv/Fm、qP、NPQ日变化值均最大,净光合速率(Pn)值也较大,为光强和CO2浓度的较优组合,说明冬季弱光条件下,适当增施CO2可以提高黄瓜叶片的光合效率,减少光照不足的影响。
The greenhouse cucumber grafted cucumber was used to study the diurnal variation of net photosynthetic rate and chlorophyll fluorescence parameters under different conditions of light intensity and CO2 concentration. The aim was to provide a reference for the high yield and quality cultivation of grafted cucumber in greenhouse. The results showed that the diurnal changes of net photosynthetic rate (Pn) and photochemical quenching (qP) showed a doublet curve under 100% light illumination, and the diurnal changes of 15% light and 32% light were single peak curve Appropriate shading can effectively alleviate the phenomenon of photosynthesis “lunch break ” in greenhouse cucumber; the maximum Pn value of 100% light + high CO2 treatment combination can effectively increase the photosynthetic efficiency of cucumber leaves, Compared with the control, the chlorophyll fluorescence parameters Fv / Fm, qP and NPQ had the highest daily change and the highest photosynthetic rate (Pn) under the 32% The results showed that under the condition of low light in winter, the appropriate increasing of CO2 could increase photosynthetic efficiency of cucumber leaves and reduce the influence of insufficient light.