Abstracts

Phenotypic and genetic diversity in 5-needle pines of Northern and Eastern Asia was analyzed. P. pumila was intermediate between P. sibirica and P. parviflora and P. koraiensis was intermediate between P. sibirica and P. armandi on complex of morphological, anatomical and genetic traits. We suppose that stone pines (subsection Cembrae) are not monophyletic. Along with some other species of subsection Strobi stone pines rather comprise a complex phylogenetic group that might have originated in consequence of reticulate evolution. This process was mediated by climate dependent rotation of divergence and hybridization of the species. Genetic processes in a currently existing hybrid zone between P. sibirica и P. pumila in the Lake Baikal region were studied. Natural hybrids are identified throughout the introgression zone (Khentei-Chikoi and Stanovoje Highlands, Khamar-Daban Range) at mean number of about five plants per hectare. Most hybrids were intermediate between the parent species on morphological and physiological traits. The hybrids have ability for vegetative reproduction and occupied ecological niches at second storey of the mixed stands but have a lower fitness and fertility as compared with pure species. Significant contribution of hybrids in total mixed stand effective pollen pool especially in fertilization of hybrid plant ovules is evidence of the phenomenon evolutionary perspectives.

Note. Abstracts are published in author's edition

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