ISHS Acta Horticulturae 630: XXVI International Horticultural Congress: Nursery Crops; Development, Evaluation, Production and Use
NON-STRUCTURAL CARBOHYDRATE CONTENT AS AN AID FOR INTERPRETING QUALITY TESTING OF NURSERY STOCK PLANTS |
| Authors: | M.C. Van Labeke, L. Degeyter |
| Keywords: | lifting, moisture content, root electrolyte leakage (REL), dormancy, Picea abies, Fagus sylvatica, Carpinus betulus |
| Abstract:
The effects of lifting date and increasing drought stress on root electrolyte leakage (REL) and moisture content of seedlings of Carpinus betulus, Fagus sylvatica and Picea abies were assessed to obtain threshold values for predicting plant quality. The relationships of REL and moisture content to survival were determined. Lifting date influenced REL and moisture content; a higher shoot moisture content (SMC) was found in October and March/April, while highest REL and moisture percentage of the roots was found in October. Furthermore, interpreting values of REL and moisture content without knowledge of the ‘hardened’ or ‘dehardened’ state of the plant could lead to wrongly classifying plant quality. Seasonal observations of bud dormancy showed that bud dormancy is insufficient for indicating the ‘hardened’ and thus more stress supporting state of the plant. Seasonal changes of non-structural carbohydrates indicated that for the studied species the presence of raffinose and/or stachyose in bud or stem tissue were good indicators for ‘hardened plants’ and could help to interpret REL values and moisture content levels with respect to plant quality assessment. | |
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