Significance of the Xenogamy in Development of the Life Strategies for Fragaria vesca L. in Western Siberia
S. O. BATURIN
Institute of Cytology and Genetics of the Siberian Branch of the Russian Academy of Sciences, 630090, Novosibirsk, Academician Lavrentyev ave., 10
Keywords: Fragaria vesca, ксеногамия, автогамия, система размножения, биотоп, жизненная стратегия, патиенты, виоленты, эксплеренты, Западная Сибирь, xenogamy, autogamy, breeding systems, biotope, life strategy, violents - competitors, patients - stress tolerants, explerents - ruderals, Western Siberia
Abstract
The Fagaria vesca L. seed reproduction in natural populations is characterized by a combination of xenogamy and autogamy. To determine the proportion of xenogamy, a field experiment was conducted. During flowering, inbred line N 08-2 was planted with native wild strawberry populations at two different biotopes. The inbred line is marked with a recessive allele c with a light yellow color of the berry. Plants from native population form berries with only red coloring - a dominant trait. Seeds from the plants of line No. 08-2 were collected after the flowering period. Genetic analysis of these seedlings was carried out on the genetic marker “berries coloring”. In case of autogamy realization, the seedlings had a light yellow color of the berries. If xenogamy was carried out, the plants had red berries. It occurred as a result of insects transfering of pollen with dominant allele C from native plants F. vesca . Significant differences in the ratio of systems of crossing - autogamy and xenogamy among a number of experimental plants after genetic analysis were shown. However, the integral value of xenogamy, realized in the seed progeny, in both natural populations of F. vesca was similar and amounted to 21 %, and the average share of autogamy was 79 %. This ratio of crossing systems for F. vesca population, is optimal for maintaining the heterogeneity of population and realizing life strategy in conditions of natural growth. With xenogamy, a certain proportion of heterozygous heterozygotes is maintained in the population capable of mastering new habitats, while the strategy of explerents is implemented. Autogamy contributes to an increase in the proportion of inbred genotypes - patients. Thus, under the conditions of the environmental heterogeneity of Western Siberia for F. vesca , due to xenogamy, there are conditions for implementing any of the three types of strategies: violents, patients and explerents, depending on the conditions of plant existence.
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