Abstract
The article presents the results of morphological and anatomical leaves study of wild species Primula macrocalix Bge. and Primula sibthorpii Hoffm. promising for horticulture growing in Dagestan. Anatomic and diagnostic traits of plant leaves, allowing their interspecies identification in the virginile period were revealed. It was found that the upper epiderm cells of P. sibthorpii were distinguished by larger sizes compared to the epidermal cells of P. macrocalix. According to the obtained data, P. macrocalix and P. sibthorpii leaves are amphistomatal, stomatal apparatus is anomocytic. In early spring flowering P. sibthorpii, the number of stomata was almost 2 times that of the mid-spring P. macrocalix. The number of stomata on P. sibthorpii leaves was almost 2 times that of P. macrocalix. The stomatal index of P. macrocalix upper epiderm leaf amounted to10.5± 2.6% and the lower epiderm was 2 times higher - 22.4%. The stomatal index of P. sibthorpii upper epiderm leaf amounted to16.7± 4.2% and the lower epiderm was 26.8± 7.2%. The index characteristic of primula species leaves showed an average variation coefficient, which is an indicator of their stomatographic traits' stability. The data obtained allow to reliably assess the authenticity of the primula species in question and can serve as a basis when compiling anatomical atlases of wild plants, as well as creating keys for determining the taxonomic species affiliation according to anatomical features.
Highlights
Primula L. (Primulaceae) genus is quite numerous - it has about 550 species distributed throughout the world, but mainly in temperate zones and in the Alpine mountain belt [1]
The study found that the diagnosed microscopic traits of P. macrocalix and P. sibthorpii leaves are species-specific and can be used in conducting interspecies identification, as well as compiling anatomical atlases of wild plants
The results of the study make it possible to conclude the stability of such an important indicator as the stomatal index of P. macrocalix and P. sibthorpii, which would certainly be a reliable distinguishing inter-species trait
Summary
Primula L. (Primulaceae) genus is quite numerous - it has about 550 species distributed throughout the world, but mainly in temperate zones and in the Alpine mountain belt [1]. To study the systematic diversity, ecological and biological features of primula species, fundamental regional taxa studies on a natural and historical scale and geographical areas are required. Since Primula genus is sufficiently large and polymorphic, the problem of interspecies plants' identification comes to the fore. This issue is especially critical when introducing wild primula species into the crop, as well as in conditions of industrial nursery [2]
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