Articles
Seasonal changes in cold hardiness of garden roses
Article number
1232_24
Pages
157 – 164
Language
English
Abstract
Garden roses are grown worldwide.
In northern regions, cold stress is an important environmental factor that can seriously affect regrowth and survival of garden roses.
Seventeen genotypes of garden roses belonging to different United States Department of Agriculture (USDA) plant hardiness zones were selected for a field screening.
The genotypes were separated into three different groups: most cold hardy group, medium hardy group and cold susceptible group based on electrolyte leakage results of stem samples performed in February 2015. Two genotypes, one belonging to the most cold hardy group and one to the cold susceptible group were chosen based on the result of this grouping.
Seasonal changes in cold hardiness and carbohydrate metabolism were studied in the winter of 2015-2016. Cold hardiness level as determined by electrolyte leakage at -20°C showed a significant difference between January and April for the most cold hardy genotype while no difference was observed for the susceptible genotype.
Increasing tissue dehydration was observed for the cold susceptible genotype from winter to spring.
In contrast, the water content was low but stable in winter and spring for the most cold hardy genotype.
Soluble carbohydrates, namely sucrose, hexoses (fructose and glucose), oligosaccharides (raffinose and stachyose), were analysed in stem tissue.
Sucrose and oligosaccharides contributed to cold acclimation in both genotypes.
In northern regions, cold stress is an important environmental factor that can seriously affect regrowth and survival of garden roses.
Seventeen genotypes of garden roses belonging to different United States Department of Agriculture (USDA) plant hardiness zones were selected for a field screening.
The genotypes were separated into three different groups: most cold hardy group, medium hardy group and cold susceptible group based on electrolyte leakage results of stem samples performed in February 2015. Two genotypes, one belonging to the most cold hardy group and one to the cold susceptible group were chosen based on the result of this grouping.
Seasonal changes in cold hardiness and carbohydrate metabolism were studied in the winter of 2015-2016. Cold hardiness level as determined by electrolyte leakage at -20°C showed a significant difference between January and April for the most cold hardy genotype while no difference was observed for the susceptible genotype.
Increasing tissue dehydration was observed for the cold susceptible genotype from winter to spring.
In contrast, the water content was low but stable in winter and spring for the most cold hardy genotype.
Soluble carbohydrates, namely sucrose, hexoses (fructose and glucose), oligosaccharides (raffinose and stachyose), were analysed in stem tissue.
Sucrose and oligosaccharides contributed to cold acclimation in both genotypes.
Authors
L. Ouyang, L. Leus, M.-C. Van Labeke
Keywords
Rosa × hybrida, freezing tolerance, soluble carbohydrates, water content
Groups involved
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