Vol. 76 No: 3

Title:
The effects of low temperatures on the vegetative growth and flowering of the primocane fruiting raspberry 'Autumn Bliss'

Authors:
J.G. CAREW, K. MAHMOOD, J. DARBY, P. HADLEY and N.H. BATTEY

pp: 264-270

Abstract:
The effects of low temperatures on subsequent vegetative growth and flowering in the raspberry 'Autumn Bliss' were investigated. In the first experiment, a number of lifting dates were used to determine the seasonal pattern of dormancy and the effect of natural chilling on plant development. In the second, different durations of artificial chilling (0, 2, 4, 6, 8 and 10 weeks at 0 C) were combined with two lifting dates to investigate the effect of natural and artificial chilling. In these experiments, plants which received little chilling grew slowly and failed to develop beyond short rosettes of leaves but as chilling increased, the rate of vegetative growth increased. This coincided with a decline in the time to flowering. These two responses, however, were distinct. In a third experiment, the effect of vernalization of actively growing canes was tested in an attempt to separate the effects of cold on time to flowering, and on the removal of dormancy. The plants responded significantly to cold treatment and flowering was advanced, indicating a distinct vernalizing effect.

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