782 



N. E. Tolhert 



Fig. 1. A. 'Thatcher' wheat seedlings 2 weeks after one soil application of 10"^ M 

 solutions: (left to right) none, (2-bromoethyl)trimethylammonium bromide, (3-bromo- 

 n-propyl)triniethylammonium bromide, and (2,3-n-propylene)trimethylammonium 

 bromide. B. Wheat plants from seed treated (left to right, 0, 10"\ 10'-, 10"^ M) 

 with (2-chloroethyl)trimethylammoniinn chloride before planting. 



and with more chlorophyll. Tap-root and leaf-stem ratios were re- 

 duced. Flowering was 3 to 10 days earlier and height of the first flower 

 clusters was reduced. Thus, earlier and more prolific flowering and 

 fruiting of market tomatoes, both under greenhouse conditions and in 

 the field, were promoted. 



Effect on Other Plants 



The three active chemicals are being tested on a variety of other 

 plants, and preliminary results only are available at the time of this 

 symposium. A similar response has been obtained wnth other vege- 

 table crops such as pepper, eggplant, cucumber, beets, and lettuce (6). 

 Solutions of 10"'' to lO-'^M, when applied to the soil, induced darker 

 green growth of yoimg sugar beet plants.- \Vhen cucinnbers were 

 treated by IQ-'M solutions, the internodes were very much shorter 

 and tendril formation was abolished. ^ High concentrations, lO^^M 



^Snyder, F. \\\, Tolbert, N. E., and Wittwer, S. H., unpublished. 

 'Mitchell, W. D., and Wittwer, S. H.. unpublished. 



