| Abstract: | Highly good correlations for the extractable activities of ribulose-1,5-bisphosphatecarboxylase, pyruvate,Pi dikinase, phosphoenolpyruvate carboxylase,NADP-malate dehydrogenase and NADP-malic enzyme and the rateof photosynthesis were found in maize leaves of various ages.The activities of the first two enzymes were similar to, orslightly higher than, the photosynthesis rate, whereas the activitiesof the other enzymes were 2 to 6 times higher than the photosynthesisrate. These results suggest that pyruvate,Pi dikinase and ribulose-1,5-bisphosphatecarboxylase may be rate-limiting factors in maize. (Received May 12, 1984; Accepted July 5, 1984) |
