Response of spring maize leaf photosynthetic physiology to different leaf temperatures under drought stress:A case study of spring maize at the flared stage

Taking spring maize as the research object,bucket planting experiment was conducted to determine the photosynthetic physiological changes and light response processes of spring maize leaves under different leaf temperature gradients during drought by using Li-6400 portable photosynthesis system,and to reveal the response mechanism of leaf photosynthetic physiology to leaf temperature changes during spring maize drought in arid areas.The results showed as follows:During drought,the net photosynthetic rate (Pn),transpiration rate (Tr),stomatal conductance (Gs) and stomatal limit value (Ls) of spring maize increase with the increase of photosynthetic effective radiation (PAR).Pn,Tr and Gs show the initial>middle>end of drought (P<0.05),while Ls show the initial