ISHS Acta Horticulturae 630: XXVI International Horticultural Congress: Nursery Crops; Development, Evaluation, Production and Use
CHILL EFFECTS ON POPLAR METABOLISM |
| Authors: | J. Renaut, S. Lutts, J.F. Hausman |
| Keywords: | Cold acclimation, soluble sugars, photosynthetic activity, Populus, poplar hybrid |
| Abstract:
Effects of low nonfreezing temperature were analysed on a poplar clone (P. tremula L. x P. tremuloides Michaux cv. Muhs 1). Poplar plants were cultured in vitro, then acclimatized in greenhouse. After 3 months, during their active growth, they were exposed to chilling stress (4°C) for 14 days. Growth, photosynthetic activity and levels of sucrose, fructose and glucose were determined. Freezing tolerance was also evaluated during the treatment on days 0, 4, 7 and 14. During the cold treatment, plant growth was greatly affected. Simultaneously, photosynthetic activity showed a significant decrease in the stressed plants. The contents of sucrose, fructose and glucose increased during cold exposure. These accumulations could be positively related with an increase in freezing tolerance. | |
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