Abstract
(1) Concerning differances of the enzyme activities of the leaves occupying differient positions on the start, we note that the activites of amylase and peroxidase are higher as their positions on the stalk are lower, but the activities of invertase and catalase are higher as their positions on the stalk are higher.
(2) After topping the activities of amylase, invertase, and peroxidase lowered temporarily, but those of topped tobacco became higher than those of non-topped tobacco at the ripening-stage. As for the activity of catalase, non-topped tobacco showed always higher activity than topped tobacco.
(3) Concerning the changes of the enzyme activities of leaf tobacco at the ripening-stage in a day, we note, that activities of amylase and invertase are highest at 12 p.m., and lowest, at 1 p.m. The activity of catalase is highest at 6 a.m., and decreases gradually. The activity of peroxidase is lowest at 6 a.m., and becomes higher gradually.
(4) The activities of amylase and peroxidase of leaf tobacco are higher as the ripeness pro-ceeds, while the activities of invertase and catalase are dower as the ripeness proceeds.
