Treatment of tomato plants with (2-chloroethyl)trimethylammonium chloride (CCC) reduced their growth in height and d. wt and increased the number of flowers formed in the first inflorescence. In plants grown at a high temperature with low light, application of CCC reduced the incidence of flower abortion in the first inflorescence. Effects of a-cyclopropyl-a-(4-methoxyphenyl)-a-(pyrimidin-5-yl)methanol (ancymidol) were similar to those of CCC while a third growth retardant, A'-dimethylaminosuccinamic acid (B-9), was effective in reducing growth in height but was without apparent effect on flower number or flower abortion.An interaction occurred between CCC and GA 3 such that effects of CCC on growth and flowering were reduced when GA 3 was also applied. Yields of diffusible gibberellin-like substances from the shoot tips were markedly reduced by treating plants with CCC but were apparently not affected by treating plants with B-9. It is suggested that effects of CCC on flowering in tomato are mediated, in part at least, through changes in levels of endogenous gibberellins.
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