Abstract
Summary When root-naked seedlings of Picea abies (L.) K arst ., Pseudotsuga menziesii (M irb .) Franco, Larix decidua Mill., Larix gmelinii var. japonica (Maxim et Regel) Pilg., Pinus sylvestris L., Pinus nigra ARNOLD, and Picea omorika (P anc ) P urk . are subjected to water stress exudation of carbohydrates by the roots is strongly increased. The increase of carbohydrate exudation correlates with the degree of damage caused to the water-stressed plants. The effect of the duration of water stress, age of plant and soil drought of the site on exudation was investigated and besides carbohydrates phosphorus compounds as well as u.v. light absorbing substances were analysed in the exudates. The results show that the quantity of exudates grows with increasing duration of water stress. Older plants exude larger quantities of carbohydrates after water stress than younger ones, and soil drought just as air drought encourages exudation of carbohydrates.
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