Volume 47 Number 3 Article 5
Year 1993 Month 7
Title: Freezing Survival of 'Mini Hardy' Blackberry Floral Tissues Before and After Budbreak
Authors: M.R. Warmund, I. Wijayaratne, R.M. Skirvin and A.G. Otterbacher
Abstract:
Dormant floral buds and inflorescences of
'Mini Hardy' blackberry (Rubus sp.) plants
were subjected to controlled freezing tests.
The
susceptibility of dormant floral buds to low
temperatures was determined by differential
thermal analyses (DTA) and the hardiness of
individual flowers at various stages of develop
ment was determined by viability testing.
The
mean temperature at which all low temperature
exotherms (LTEs) were detected in primary
buds was -15.0, -18.4, and -13.8°C in Novem
ber, January, and March, respectively.
The
mean LTE temperature for secondary buds
was -24.8°C in January and -18.9°C in March,
indicating that secondary buds could provide a
replacement crop when the primary bud was
injured.
After budbreak, inflorescences deacclimated
as bloom progressed.
When the flowers
were at tight bud, the temperature range in
which all flowers in the inflorescence were
injured was 1.6°C. However, when the terminal
flower was at full bloom or at a later stage of
development, the critical temperature range
was < 0.3°C.
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