STRUCTURE OF THE YIELD OF FEMALE CONES OF SIBERIAN STONE PINE WITH AN ANNUAL REPRODUCTIVE CYCLE
A. V. Lukina, I. N. Tret’yakova
Krasnoyarsk Science Centre of the Siberian Branch of Russian Academy of Science, V. N. Sukachev Institute of Forest, Russian Academy of Sciences, Siberian Branch, Krasnoyarsk, Russian Federation
Keywords: Pinus sibirica Du Tour, annual reproductive cycle, seed production, female cone, seed scales
Abstract
Forms of Siberian stone pine ( Pinus sibirica Du Tour) (Siberian pine) with an annual reproductive cycle are unique natural models for studying reproductive processes, speciation and evolution of gymnosperms, as well as potential for genetic selection work aimed at obtaining high-yielding Siberian stone pine plantations. The study of the yield structure and seed productivity of Siberian stone pine trees with an annual cycle of female cone development showed that all growth characteristics of cones (linear dimensions, cone and seed weight) are significantly lower than in typical individuals, and morphogenetic characteristics (the number of seed scales) and the level of variability of yield structure characteristics are comparable to variability in Siberian stone pine populations as a whole. At the same time, for individual specimens with one-year development of reproductive structures, high seed productivity of female cones is characteristic (76.7 %). Selection and fixation in the offspring of traits that ensure stable yields of Siberian stone pine seeds are recognized as promising areas of breeding of Siberian stone pine. Species with one-year development of female cones are unique genotypes with the potential to obtain new varieties and forms.
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