| Abstract |
Physiological effects of 2,4-D on the growth of Chlorella ellipsoidea were investigated culturing the alage in the MN4 media containing 0.10^-4 M and 4×10^-4 M 2,4-D. During 6 days culture were taken to analysis with respect to overall growth, photosynthesis, respiration and chemical composition. Results obtained from the experiment were as follows : 1) The growth of chlorella was increased at 10^-4M and decreased at 4×10^-4M of 2,4-D concentrations 2) At 10^-4M pf 2,4-D concentration, the activity of photosynthesis enhanced relative to control, while at 4×10^-4 M it was not changed. In both concentrations, however, the rate of respiration was down from the control. 3) At 10^-4 M 2,4-D, the concentration of carbonhydrate metabolites was not changed relative to control, while significant increase in the concentrations of proteins and nucleic acids was observed. On the other hand at 4×10^-4 M of 2,4-D concentrations, all the metabolites including carbohydrates, proteins and nucleic acids were decreased. 4) It is concluded that 2,4-D at 10^-4 M concentration accelerates the growth of chlorella by promoting the activities of photosynthesis and biosynthesis of proteins and nucleic acids. |
