Vol. 14 No. 1-2. (2008)
Articles

Frost induced changes in enzyme activities and carbohydrate content in the spurs of some pear cultivars during the dormancy

Published February 19, 2008
K. Honty
Corvinus University of Budapest, Hungary, Faculty of Horticultural Science, Dept. of Fruit Science,
É. Sárdi
Corvinus University of Budapest, Hungary, Faculty of Horticultural Science, Dept. of Genetics and Horticultural Plant Breeding
É. Stefanovits-Bányai
Corvinus University of Budapest, Hungary, Faculty of Food Science, Dept. of Applied Chemistry H-1118 Budapest Villányi út 35-43, Hungary
M. Tóth
Corvinus University of Budapest, Hungary, Faculty of Horticultural Science, Dept. of Fruit Science
pdf

APA

Honty, K., Sárdi, É., Stefanovits-Bányai, É., & Tóth, M. (2008). Frost induced changes in enzyme activities and carbohydrate content in the spurs of some pear cultivars during the dormancy. International Journal of Horticultural Science, 14(1-2.), 41-44. https://doi.org/10.31421/IJHS/14/1-2./780

Frost tolerance of pear cultivars was checked after artificial cold treatment in 2003-2005. Limbs collected during the endodormancy were exposed in a climatic chamber for 24 hours to —25; —28 °C, while those collected in the ecodormancy were kept at —15 and —18 °C. Frost damages of buds were registered according to a visually defined scale, then peroxidase (POD), polyphenol oxidase (PPO) enzyme activities and carbohydrate contents were checked in buds and spur-part below the buds. POD activity of untreated control in tissue below buds was higher than in the buds, which were increasing continuously during the endodormancy and decreased at the end of the ecodormancy. During endodormancy, cold treatment of —25 and —28 °C effected different changes of enzyme activity in buds of the cultivars. In the ecodormancy, enzyme activities increased after a cold treatment of —15 °C, whereas the activities decreased significantly after —18 °C. `Kaiser' — susceptible to frost — with its higher values of both enzyme activities marked out from other cultivars, which is correlated with its stress response. Changes in carbohydrate components — especially in glucose — of buds monitored well the different stress responses of tolerant and resistant pear cultivars induced by frost stress.

Downloads

Download data is not yet available.

Metrics

Metrics Loading ...