Abstract: To research difference of photosynthesis characteristic between leaf and pod of rape,the hybrid of Brassica napus Qinyou No.7 with double low and high oil content was chosen to compare the difference of photosynthetic gas exchange parameters between leaf and pod under different illumination,CO₂ concentration,temperature and time in one day.The results were as below:The change trends of photosynthetic gas exchange parameters of leaf and pod were same along with the change of illumination,CO₂ concentration,temperature and time in one day.Under the condition of same illumination,the net photosynthetic rate (Pn),stomatal conductance (Cond),tramspiration rate (Trmm),water use efficiency (WUE),limitation stomatal value (Ls) and light quantum efficiency of leaf were all higher than pod in contrast with the intercellular CO₂ concentration (Ci),light saturation point,light compensation point and light respiration rate of leaf were lower than pod.Under the condition of same CO₂ concentration,the Pn,WUE,Ls and carboxylation efficiency of leaf were higher than pod,but the Ci,CO₂ compensation point and CO₂ saturation point and were lower than pod.The optimum temperature of photosynthesis of leaf was lower than pod and the Pn,Cond,Trmm,Ls of leaf were higher than pod in contrast with Ci and WUE of leaf were lower than pod in the range of each optimum temperature and same temperature.The Pn,Cond,Ls and WUE of leaf were higher than pod but the Ci and Trmm were lower than pod in range of whole daily change.

Key words: Brassica napus, Leaf and pod, Gas exchanges parameters, Difference

CLC Number: 

• S635.01