Chill unit models for blackcurrant (Ribes nigrum L.) cultivars ‘Ben Gairn’, ‘Ben Hope’ and ‘Ben Tirran’ |
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Authors: | G.A. Rose R.W. Cameron |
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Affiliation: | aSchool of Biological Sciences, University of Reading, Reading, Berkshire, RG6 6AT, UK |
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Abstract: | Temperate-zone crops require a period of winter chilling to terminate dormancy and ensure adequate bud break the following spring. The exact chilling requirement of blackcurrant (Ribes nigrum), a commercially important crop in northern Europe, is relatively unknown. Chill unit models have been successfully utilized to determine the optimum chilling temperature of a range of crops, with one chill unit equating to 1 h exposure to the optimum temperature for chill satisfaction. Two-year-old R. nigrum plants of the cultivars ‘Ben Gairn’, ‘Ben Hope’ and ‘Ben Tirran’ were exposed to temperatures of −10.1 °C, −3.4 °C, 0.1 °C, 1.5 °C, 2.1 °C, 3.4 °C or 8.9 °C (±0.7 °C) for durations of 0, 2, 4, 6, 8 or 10 weeks and multiple regression analyses used to determine the optimum temperature for chill satisfaction. |
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Keywords: | Ribes nigrum Dormancy Chilling Phenology Growth stage |
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