Effects of vernalization and exogenous gibberellins on curd induction and carbohydrate levels in the apex of cauliflower (Brassica oleracea var. botrytis)

Journal ar
Scientia Horticulturae
  • Volumen: 70
  • Número: 2-3
  • Fecha: 01 julio 1997
  • Páginas: 223-230
  • ISSN: 03044238
  • Tipo de fuente: Revista
  • DOI: 10.1016/S0304-4238(97)00059-9
  • Tipo de documento: Artículo
The effect of applying gibberellins (GA4+7) to autumn cauliflower plants (Brassica oleracea var. botrytis, cv. Nautilus) grown under strong (10°C) and weak (22°C) curd-inducing conditions was studied, and the carbohydrate levels in the apex were analysed. Plants grown at 10°C developed hardly any new leaves, and there was no increase in accumulated dry matter in the leaves compared with plants cultivated at 22°C. Curd initiation occurred after three weeks at 10°C after the appearance of 23 leaves. Identical results, were obtained rafter the application of gibberellins to plants grown at this temperature. However, at 22°C, the application of gibberellins reduced the number of initiated leaves by 30%. Curd initiation occurred after the initiation of 28 and 44 leaves by treated and untreated plants, respectively, although a week earlier in the treated plants. The sugars identified in the apex were glucose, fructose and sucrose. Levels of these carbohydrates increase in plants cultivated at 10°C, although the applications of gibberellins, both to plants cultivated at 10°C and 22°C, increased the carbohydrate content in the apex. Taken together, these results suggest that the applications of gibberellins advances curd initiation in cauliflower only under sub-optimal conditions of vernalization.

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