不同树莓品种光合特征1）

测量了‘海瑞特兹’、‘秋福’、‘秋红’和‘四季红’4个树莓品种的光合曲线、CO2曲线与光合特征日变化。结果表明：4个树莓品种光饱和点为742．50～887．50μmol·m －2· s－1,光合有效辐射超过饱和点后光抑制现象不明显。光补偿点为20．58～72．09μmol· m－2· s－1,光饱和光合速率为9．82～17．73μmol· m－2· s－1,表观量子效率为0．0381～0．0445。4个树莓品种CO2补偿点为89．95～104．43μmol· mol－1,CO2饱和点为1136．67～2860．00μmol· mol－1,最大再生速率为25．75～45．41μmol· m－2· s－1,羧化效率为0．0258～0．0393。4个树莓品种的净光合效率日变化曲线均呈双峰型,峰值分别大约出现于08：00和16：00。4个树莓品种均具阴生植物特征。露地栽培时四季红净光合速率最高,在高CO 2摩尔分数条件下,秋红和海瑞特兹碳同化能力最优。

Photosynthetic Cha racteristics of Diffeer nt Raspberries Cultivars

We studied light response curves , CO2 response curves and diurnal photosynthesis changing curves of four raspberries cultivars including Autumn Bliss, Heritage, Red Autumn and Sijihong.The light saturation points (LSP) of four raspber-ries were in 742.50-887.50μmol· m-2 · s-1 , and there was no obvious Pn changing when photosynthetic active radiation was above LSP .Light compensation point of four cultivars were in 20.58-72.09μmol·m -2 · s-1 .The maximum net photo-synthetic rate (MNPR) were in 9.82-17.73μmol· m-2· s-1, and quantum efficiency were in 0.038 1-0.044 5.The CO2 compensation point were in 89.95-104.43μmol· mol-1, and CO2 saturation point of four cultivars were in 1 136.67-2 860.00μmol· mol-1 .The maximum Ru, B, P regeneration rate and carboxylation efficiency of four raspberries were in 25.75-45.41μmol· m-2· s-1, and 0.025 8-0.039 3, respectively.There were two peaks in photosynthesis changing curves of four raspberries, and the peak values occurred at about 8:00 and 16:00, respectively.Four cultivars showed shade plant char-acteristics.Cultivar Sijihong showed highest net photosynthetic rate under normal air CO 2 concentration, while the carbon assimilation capacity of cultivar Red Autumn and Heritage was the highest between four cultivars .