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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This study was conducted in the greenhouse of Biology Department in the College of Science-Salahaddin University-Erbil, which consisted of interaction application of Salicylic acid (SA) concentrations (0,100,200,400 ppm) and Lead (Pb) concentrations (0, 5, 10 ppm) on vegetative growth, yield and chemical components of common bean. It was found that SA significantly decreased the harmful effects of Pb on the vegetative growth characteristics such as plant height, number of leaves.plant -1 , number of branches.plant -1 , the dry weight of the shoot system, and yield components such as number of seeds.pod -1 , dry weight of 100 seeds. The adverse effects of Pb on chemical components such as chlorophyll a and total chlorophyll contents, total protein content of leaves , and total sodium by the influence of salicylic acid.