57 

 as percent of total translocated material present in a given plant 

 part. 



Mean dpm/mg of plant material and mean percent of total 



14 

 translocated C-labeled material per plant part per harvest day were 



calculated. Mean dpm/mg and mean percent of translocated 2,4-D of 



plants receiving pretreatment with gibberellic acid were compared 



with means from untreated plants. A simple t-test for determining the 



presence of significant differences between two means was used (Walpole 



and Myers, 1978). Prior to comparison of the mean percentages of 



translocated radioactivity, an arcsine transformation was performed in 



order to normalize the distribution (Sokal and Rohlf, 1969). 



Results and Discussion 



In general, results presented below indicate that, without regard 



14 

 to gibberellic acid treatment, movement of C labeled 2,4-D follows 



a pattern of polar movement towards rapidly growing tissues such as 

 meristematic shoots and newly emerging daughter plants as previously 

 documented for waterhyacinths and other species (Audus, 1972; Ashton and 

 Crafts, 1973; Singh and Muller, 1979b). 



Tables 2-1 and 2-2 summarize the results of the movement through 

 time of the C-labeled 2,4-D within treated waterhyacinths expressed 

 as dpm/mg dry plant material and percent of total amount of translo- 

 cated radioactivity, respectively. Tables 2-3, 2-4, 2-5, and 2-6 pre- 

 sent a detail analysis of the results on a dpm/mg basis for the plants 

 harvested on days 1, 3, 6 (trial 1), and day 6 (trial 2), respectively. 



Tables 2-7, 2-8, 2-9, and 2-10 present a similar analysis of the 



14 

 results on a percent of total amount of translocated C-labeled 2,4-D. 



