Parallelism in the development life forms species of the genus Kudrjaschevia (Lamiaceae): ontogenesis, architectural analysis
V. A. Cheryomushkina1, A. Yu. Astashenkov1, D. S. Saidov2
1Central Siberian Botanical Garden of SB RAS, Novosibirsk, Russia
2Institute of Botany, Physiology and Genetics of Plants of AS RT, Dushanbe, Tajikistan
Keywords: архитектура растений, Kudrjaschevia, онтогенез, жизненные формы, architecture of plant, ontogenesis, life form
Abstract
The study is aimed at studying the herb life forms of closely related narrowly localized endemic species of the genus Kudrjaschevia in Central Asia. A detailed description of life forms will make it possible to identify morphological rearrangements of plants associated with the adaptation of species to certain ecological conditions. Our results will expand our understanding of the main directions in the evolution of morphs, which is practically not studied in plants of the Central Asian flora. In the process of somatic evolution, individuals of this group adapted to various specific habitats: rocks - K. nadinae , K. grubovii , K. pojarkoviae ; mountain scree - K. allotricha ; rocky outcrops of the mountain slopes - K. korshinskyi . Using an architectural approach to the description of plants, it was found that various ecotopic and ecological-coenotic conditions did not affect the nature of the development of life forms of related taxa. Parallelism in the development of life forms in the studied species is manifested in the passage of the same phases of morphogenesis: primary shoot, main axis, primary bush (clone) and in the preservation of a monocentic biomorph. In ontogenesis in individuals of closely related species, similar reiteration of axes is formed. Each axis characterized as an annually dying branching / non-branching with radial symmetry, having opposite phyllotaxis, the apical meristem of which is realized in inflorescence. The long-term basis of plants in all representatives of Kudrjaschevia was built as a result of sympodial sequential articulation of the short basal parts of the axes (residues) according to the monochasial / dichasial types. Despite the difference in the aerial parts of the studied rock ( K. nadinae , K. grubovii , K. pojarkoviae ) and mountain slope species ( K. allotricha , K. korshinskyi ), the shoot formation and the common long-term basis of the individuals are the same. The diversity of the aerial parts of the axes reflects the adaptation of plants to specific ecological conditions, while maintaining a genetically fixed, general development program.
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