CHANGES OF WATER STATE IN VINE CANE DURING GROWING AND DORMANT SEASONS

Authors:	S. Misik, &. Szívós
Keywords:	bound water, dielectric constant, microwave method
Abstract: The bound water in living tissue plays an important role in the resistance to unfavourable environmental conditions - such as frost and drought. For studying the bound water (i.e. water state, water binding) a microwave cavity resonator measuring method was developed. The changes of bound water in samples - taken from the xylem of vine cane - during dormant and growing seasons were examined to compare different grape varieties, different years, two growing sites and two parts of the same vineyard on a steep slope. The following conclusions might be drawn from the experiments: The general level of the water binding is genetically determined. There is a rhythmic fluctuation of endogenous origin in water state around the general level as a status of equilibrium. Endogenous and external factors equally play their part in the changes of water state.
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