Abstract:
:Differential thermal analysis detected two freezing events when dormant forsythia (Forsythia viridissima Lindl.) flower buds were cooled. The first occurred just below 0 degrees C, and was coincident with the freezing of adjacent woody tissues. The second exotherm appeared as a spike between -10 and -25 degrees C and was correlated with the lethal low temperature. Although this pattern of freezing was similar to that observed in other woody species, differences were noted. Both direct observations of frozen buds and examination of buds freeze-fixed at -5 degrees C demonstrated that ice formed within the developing flowers at temperatures above the second exotherm and lethal temperature. Ice crystals had formed within the peduncle and in the lower portions of the developing flower. Ice also formed within the scales. In forsythia buds, the developing floral organ did not freeze as a unit as noted in other species. Instead the low temperature exotherm appeared to correspond to the lethal freezing of supercooled water within the anthers and portions of the pistil.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Ashworth ENdoi
10.1104/pp.92.3.718subject
Has Abstractpub_date
1990-03-01 00:00:00pages
718-25issue
3eissn
0032-0889issn
1532-2548journal_volume
92pub_type
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