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Abstract
Strawberry plants (Fragaria × ananassa Duch. cv. Catskill) were subjected to several freezing temperatures to study growth and development following various degress of crown injury. The T50 was approximately —l2.5°C, but exposure to nonlethal temperatures resulted in abnormal growth of leaves, early runner production, decreased blossom numbers, and browning of crown tissues. Browning of crown tissues was associated with number of runners, number of blossoms, size of leaves, dry wt of leaves, and test temperatures. Number of blossoms emerging was negatively correlated with low freezing temperature, while early runner emergence was positively correlated with low temperature.
Abstract
Controlled freezing of everbearing strawberry blossoms (Fragaria × ananassa Duch.) at weekly intervals during the autumn bloom period indicated that the killing temperature decreased about 2°C. During the June bloom period, the killing temperature was similar for June-bearing and everbearing cultivars.
Abstract
The viability of freeze-stressed Fragaria × ananassa Duch. cv. Catskill strawberry crown tissues was evaluated using triphenyl tetrazolium chloride (TTC) reduction and oxidative browning. Both tests showed the medulla tissue to be the most susceptible to low-temperature injury, while vascular tissue was least susceptible. TTC reduction appears to be negatively related to tissue browning, and both provide similar results pertaining to tissue viability.