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Abstract
Floral induction of broccoli (Brassica oleracea italica) ‘Waltham 29’ at low temp (5°C) was associated with increasing levels of starch and sugar in the shoot tip. This same relationship was found in experiments concerning plant age, duration of cold treatment, leaf removal before and during cold treatment, and treatment with succinic acid 2,2-dimethylhydrazide (SADH) or gibberellic acid (GA3).
Greenhouse experiments with plants grown continuously at 16-21°C or 21-27°C indicated that high carbohydrate levels are not necessarily associated with flowering. Flowering was delayed at the higher temp with little difference in carbohydrate level.
Abstract
The effects of growth retardants succinic acid 2,2-dimethylhydrazide (SADH), (2-chloroethyl) trimethylammonium chloride (CCC) and 2,4-dichlorobenzy 1-tributylphosphonim chloride (CBBP) on growth and flowering of Brassica oleracea var. italica, cv. ‘Waltham 29’ (broccoli) were investigated. All 3 compounds reduced plant height. At higher concn SADH reduced the no. of plants flowering in both cold and non-cold treated plants. Neither floral induction nor leaf no. was significantly affected by CBBP or CCC. Leaf no. increased with increasing conc of SADH, as a probable result of the increased inhibition of floral initiation.