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© 1995 Oxford University Press

RESEARCH-ARTICLE

Vernalization in calabrese (Brassica oleracea var. italica) - a model for apex development

D. C. E. Wurr1, J. R. Fellows, K. Phelps and R. J. Reader

Horticulture Research International, Wellesbourne Warwick CV35 9EF, UK

1 To whom correspondence should be addressed. Fax: + 44 1789 470552.

Using data from an experiment in controlled environment cabinets, with temperatures between 7 °C and 23 °C, a model of vernalization was developed which predicts the change in apex diameter of calabrese with temperature. The model does not include a juvenile phase and the rate of diameter growth is maximal at 15.8 °C. When tested on field-grown crops of two cultivars, the model described apex expansion well.

Key words: Model, cardinal temperatures, juvenility, vernalization, initiation


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