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Annals of Botany 72: 613-617, 1993
© 1993 Annals of Botany Company

Freezing Events within Overwintering Buds of Blackcurrant (Ribes nigrum L.)

Wendie Stone, D. B. Idle and R. M. Brennan

Department of Plant Biology, University of Birmingham, Edgbaston, Birmingham B15 2TT, and Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, UK

Overwintering buds of blackcurrant cultivars 'Ben Lomond' and 'Ben More' were examined by differential thermal analysis (DTA). Photographic evidence relates the first (primary) exotherm to the freezing of water in the basal pith and bud scales. The number of secondary exotherms either matched, or was fewer than, the number of floral racemes within the bud. There is evidence in the structure of the secondary exotherms that the freezing of individual primordia was being recorded.Copyright 1993, 1999 Academic Press

Differential thermal analysis, freezing injury, buds, Ribes nigrum, blackcurrant


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