EN
Stress conditions affect photosynthetic productivity as well as distribution of photoassimilates. Depending on the kind of stress which may more strongly affect sink growth or the rate of photosynthesis, source - sink relationships are modified according to the general strategy: stressor avoidance or tolerance. The problem of the competition between sinks and their priority under conditions when e.g. photosynthesis or water supply are limiting factors is discussed with attention to the role of hormones.