Abstract
Thymus jenisseensis is endemic to Southern Siberia. The structure of Thymus jenisseensis were studied with the use of an architectural approach. The architectural unit consist of branched compound skeletal axis of the 1st and 2nd order, and is repeated many times in the structure of adults. As a result of studying the architectural units of individuals growing in different sites of a coenopopulation, in the upper border of the forest belt (Tsagan-Shibetu, Republic of Tuva), differences were identified. An architectural unit consisting of branched orthotropic or ascending basisympodially accreting compound skeletal axes develops on a site of a dry riverbed; an architectural unit consisting of branched orthotropic or ascending acrosympodially accreting compound skeletal axes develops on a site of high-altitude steppe on a plain. The diversity of compound skeletal axes in the structure of architectural units contributes to the formation of two biomorphs (dwarf subshrub and dwarf shrub), changes in the vitality and duration of development of T. jenisseensis individuals. The identified features of architecture are morphological mechanisms of adaptation of the species to living conditions.
Highlights
One of the modern approaches to studying taxonomically complex groups of plants is to identify architectural units in their structure
The article is devoted to the study of endemic to Southern Siberia T. jenisseensis Iljin
The material is collected in two sites of a coenopopulation (SCP): 1 – the dry riverbed, individuals of a species were located on sandy substrate among the pebbles; 2 – the high-altitude grass steppe on a plain, individuals of a species were located on soil among the outcrops of stones (Fig. 1b)
Summary
One of the modern approaches to studying taxonomically complex groups of plants is to identify architectural units in their structure. The aim of the work is to study the architecture of T. jenisseensis to identify mechanisms of its adaptation to habitat conditions. Individuals of T. jenisseensis have a branched compound skeletal axis (CSA).
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