weight of 1000 seeds

Features of seed reproduction of Fritillaria ruthenica Wikstr. in natural populations

Authors: Leonova A. A., Shilova I. V., Petrova N. A., Kostetsky O. V.

It was found that real seed productivity of Fritillaria ruthenica Wikstr. in natural populations of the Saratov region is up to 82%. Seed germination under laboratory conditions is rather high (93–100%), however, the damaging effect of phytophagous insects has a negative impact on seed regeneration in some populations.

Seed regeneration in some populations of Bulbocodium versicolor (Ker-Gawl.) Spreng. in Saratov region

Authors: Kulikova L. V., Petrova N. A., Shilova I. V., Serova L. A., Kashin A. S.

The article presents the results of the study of age structure and density of natural populations of Bulbocodium versicolor (Ker-Gawl.) Spreng. in the Saratov region. The populations of B. versicolor show internal density fluctuations, and differences in density may be 2–5-fold in some years. It was found that the majority of the studied populations of B. versicolor are either juvenile or in the transition from the juvenile stage to maturity and vice versa. Only one population is mature.