3个木通品种光合特性的比较

Comparison of photosynthetic characteristics of three Akebia cultivars

为了筛选高光效的木通品种,为木通引种栽培提供理论依据,利用Li-6400xt便携式光合仪对3个木通品种(木通、三叶木通、白木通)的光合参数和叶绿素含量进行测定,分析了其光合-光响应曲线及CO2响应曲线,比较了3个品种之间光合特性的差异。结果表明,木通的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr)、胞间CO2浓度(Ci)、叶绿素含量、最大净光合速率(Pmax)、光饱和点(LSP)、羧化效率(CE)均高于三叶木通和白木通,且差异显著(P<0.05);木通的水分利用效率(WUE)、光补偿点(LCP)、表观量子效(AQY)、暗呼吸速率(Rd)、CO2饱和点和CO2补偿点均低于三叶木通和白木通;3个木通品种的光合效率由高到低的顺序为木通、三叶木通、白木通。

In order to screen out Akebia cultivar with high photosynthetic efficiency and to provide theoretical basis for introduction and cultivation of Akebia, photosynthetic parameters and chlorophyll content in three Akebia cultivars were determined by Li-6400xt portable photosynthesis system, photosynthetic-light response curves and photosynthetic-CO2 response curves for three Akebia cultivars （14. quinata, A. trifoliata, A. trifoliata var） were analyzed, and differences of photosynthetic characteristics in three Akebia cultivars were compared. The results showed that： （1） Most of indexes of A. quinata were higher than those ofA. trifoliata and A. trifoliata var, and the differences between them reached significant level （P〈0.5）, including net photosynthetic rate （Pn）, stomatal conductance （Gs）, transpiration rate （Tr）, intercellular CO2 concentration （Ci）, chlorophyll content, the maximum net photosynthetic rate （Pmax）, light saturation point （LSP）, and carboxylation efficiency （CE）; （2） Some indexes ofA. quinata are lower than A. trifoliata and A. trifoliata var., and they were water use efficiency （WUE）, light compensation point （LCP）, apparent quantum yield （AQY）, dark respiration rate （Rd）, CO2 saturation point and CO2 compensation point; （3） The order of three Akebia cultivars based on photosynthetic efficiency from high to low was A. quinata, A. trifoliate, A. trifoliata var.