Effect of climatic conditions on the expression of self-fertility in Scots pine

The results of 12-year experiment on monitoring the types of Scots pine seed reproduction systems in Voronezh oblast are generalized. Sample structure with respect to self-fertility in optimal years is characterized and its transformations in years with weather anomalies (cold, warm, moderately and severely droughty) are described. It is shown that the contribution of self-fertilization to annual seed production increases proportionally to the severity of weather stress affecting the population.