Micromorphological structure of Phacelia tanacetifolia (Benth.) aboveground organs
UDC 581.4:581.84:582.948.2
Abstract
The genus Phacelia Juss. was included to the Boraginaceae family as a subfamily Hydrophylloideae according to the modern classification. However, within the Boragaginaceae family, plants of the genus Phacelia are morphologically very different from species of the other genera, which emphasizes the evolutionary isolation of the genus within the family. The aim of the work was to study the epidermis micromorphology of the above-ground organs of Phacelia tanacetifolia Benth and to identify structural features. As a result, it was established that the leaf has a hypostomatic structure with an anamocytic stomatal apparatus; pubescence is represented by 3 types of trichomes: simple straight unicellular trichomes with an expanded base, simple retort-shaped trichomes along the leaf edge and rare capitate trichomes with a two-celled stem. The structural features include abundant pubescence of the sepals with simple straight and curved trichomes and abundant inclusion of druses in the mesophyll. The presence of druses in the mesophyll of the petals, pubescent with simple thin-walled curved trichomes, as well as characteristic papillary outgrowths along the edge of the petal, is established. It should be noted the fundamental presence of druses in the petals and their abundant pubescence, characteristic of the studied plant, which sharply distinguishes it from the other plants of this family and generally confirms the allocation of P. tanacetifolia, at least, to a separate subfamily.
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