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低温处理中能降低黄瓜幼苗的净光合速率 ,同等条件下低温锻炼的黄瓜幼苗 ,比未锻炼幼苗降低较少 .低温锻炼后和低温处理使幼苗气孔导度和叶肉细胞间CO2 浓度的降低 ,气孔限制值上升 .未经低温锻炼的黄瓜幼苗在净光合速率降低的同时 ,叶肉细胞间CO2 浓度增加 ,气孔限制值下降 ,光合作用的降低主要以非气孔限制为主
Low temperature treatment can reduce the net photosynthetic rate of cucumber seedlings under the same conditions of low temperature cucumber seedlings reduced less than the unexposed seedlings after cold temperature training and low temperature treatment so that the seedling stomatal conductance and intercellular CO2 concentration decreased, The limiting value increased.Unfortunately, the photosynthetic rate of cucumber seedlings without hypothermia decreased while the intercellular CO2 concentration in mesophyll increased, the stomatal limitation decreased, and the decrease of photosynthesis was mainly dominated by non-stomata