接种菌根菌后板栗幼苗光合作用的光响应曲线

Light response curve of inoculated Castanea mollissima seedling photosynthesis

以接种外生菌根菌绵毛丝膜菌Cortinarius sublanatus的板栗幼苗和未接菌的板栗幼苗为材料,分别测定它们叶片的光合数据,用非直角双曲线方法对他们的光响应曲线进行拟合。拟合结果显示,两种材料非直角双曲线模型的拟合结果与实际测量值非常接近,接种菌根菌后的苗木α表光量子效率增长了13.33%,Pmax最大净光合速率增长了49.72%,Rd暗呼吸速率降低了26.91%,LCP光补偿点降低了4.34%,LSP光饱和点增长了25.66%。上述结果表明非直角双曲线模型适合板栗幼苗光合作用的光响应曲线拟合,接种菌根菌后板栗幼苗的光能利用效率增高,利用弱光能力增强,对强光的适应能力和利用能力增强,而消耗光合产物的速率降低。

By taking Castanea moll＆sima seedlings inoculated with Cortinarius sublanatus and no ctomycorrhizal fungi inoculated chestnut seedlings as the tested materials, their photosynthetic data were respectively measured. Based on the photosynthetic data, the light response curves of the two tested materials were fitted by using the non-rectangular hyperbolic model. The results show that the fitting value of non-rectangular hyperbolic model was close to the measured value; the apparent quantum yield of inoculated chestnut seedling increased by 13.33%, the maximum net photosynthetic rate of inoculated chestnut seeding increased by 49.72%, the dark respiration rate of inoculated chestnut seeding decreased by 26.91%, the light compensation point of inoculated chestnut seeding decreased by 4.34%, the light saturation point of inoculated chestnut seeding increased by25.66%. The conclusion was that the rectangular hyperbolic model was propitious to fit the photosynthetic data of chestnut seedling; after the seedling inoculated with C. sublanatus, their＇s efficiency of light utilization was increased, the capacity of using low light was increased and the capacity of fitting and using high light was increased, however the speed of consuming of photosynthetic products was reduced.