Effect of extreme heat on winter wheat canopy carbon assimilation Relationship of Photosynthetic Carbon Assimilation Related Traits of Flag Leaves with Yield Heterosis in a Wheat Diallel Cross Characteristics of Accumulation, Transition and Distribution of Assimilate in Summer Maize Varieties with Different Plant Height Physiological Responses of the Photosynthetic Carbon Assimilation to Environmental Factors in three Sandy Plants Research Progress on the Impact of Salicylic Acid on Plant Photosynthesis Discussion on simultaneous measurements of leaf gas exchange and chlorophyll fluorescence for estimating photosynthetic electron allocation THE EFFECT AND REGULATING MECHANISM OF NITROGEN NUTRITION ON CANOPY PHOTOSYNTHETIC CARBON ASSIMILATOIN IN WHEAT