14 

 1974), prevention or delay in flowering (Stowe and Yamaki , 1957; Weaver, 

 1972), leaf heterophylly (Stowe and Yamaki, 1957; Stuart and Cathey, 

 1961; Israelstam and Davis, 1979), chlorosis (Stowe and Yamaki, 1957; 

 Ende and Koornneef, 1960; Weaver, 1972; Sarma and Hussain, 1979), inhi- 

 bition or no effect on root growth (Brian et al . , 1955; Kato, 1958b), 

 delay and/or acceleration of senescence (Brian et al . , 1955; Stowe and 

 Yamaki, 1957; Stuart and Cathey, 1961; Addicott, 1970; Weaver, 1972; 

 Valdovinos, 1974; Salisbury and Ross, 1978); vernalization (Stowe and 

 Yamaki, 1957; Stuart and Cathey, 1961; Weaver, 1972), stem elongation 

 (Brian et al . , 1955; Marth et al . , 1956; Stowe and Yamaki, 1957; 

 Phinney and West, 1961; Stuart and Cathey, 1961; Audus, 1972; Weaver, 

 1972; Low, 1974; Watson, 1982) and increases in shoot to root weight 

 ratio (Stowe and Yamaki, 1957; Stuart and Cathey, 1961; Weaver, 1972; 

 Low, 1974). 



Effects on fresh and dry weights reported for gibberellic acid 

 treatments are varied. Morgan and Mees (1956) reported increased vege- 

 tative growth of a majority of the species tested but no increases in 

 net yield. Ende and Koornneef (1960) reported a 25 percent increase in 

 stem length in tomato plants treated with gibberellic acid; however, 

 there was no significant difference in plant weights when compared to 

 untreated plants. Stuart and Cathey (1961) noted increases in yield of 

 dry matter in winter pasture grasses but no increase in total weight of 

 Eucalyptus. Stowe and Yamaki (1957) reviewed the effects of gibberel- 

 lins on fresh and dry weights of plants and concluded that gibberellin- 

 induced elongation does not always cause a parallel increase in dry 

 weight and, in fact, may result in a decrease depending upon the species, 

 Marth et al . (1956) investigated the effects on the weight of soybean 



