Abstract
In order to find the correlation between the environmental factors and frequency of accessory chromosomes in different populations of rye, clonal plants divided from a plant to get the uniformly genotypical constitution were grown under the different temperature or soil moisture conditions. The frequency of acc. chromosomes was lower in the progeny populations derived from the plants grown under the high temperature or dry soil conditions. Such a low frequency may be due to the highly meiotic elimination of acc. chromosomes, the less occurrence of nondisjunction at pollen mitosis and the decrease of seed fertility of the parental plants under such unfavourable conditions.
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