Summary

Seasonal dynamics of total non-structural carbo-hydrates (TNC) in relation to the leaf-fruit ratio were measured over five years at different grapevine pheno-logical stages in one- and two-year-old canes, trunks and roots of the cultivar 'Chasselas ' (Vitis vinifera L.). Carbohydrates were mainly stored as starch in differ-ent parts of the grapevine during the growing season. Soluble carbohydrates represented only a small part (< 7 % of dry weight, DW) of the TNC. In the roots and trunks, the starch content fluctuated during the growing season, reaching the lowest values between budbreak and flowering depending on the year, and the highest values between harvest and leaf fall. The soluble sugar content increased in the trunks and the two-year-old canes during the winter period with th