Abstract
The structure, micromorphology and distribution of trichomes on <i>Dracocephalum moldavicum</i> L. shots were investigated using light and scanning electron microscopy (SEM). There were distinguished 3 types of non-glandular trichomes, 3 types of glandular trichomes and papillae of the osmophore in the epidermis of the corolla. The highest density of non-glandular and glandular trichomes was found on the abaxial surface of the calyx, on bracts and in the upper part of the stem. Structural variations in the head and stalk of long glandular trichomes were demonstrated. The dimensions of particular types of trichomes are given in the present paper. Differences in the structure of the trichomes of this species are presented, compared to literature data. The micromorphology of particular trichome types is documented in numerous photographs showing the rich ornamentation of the cuticle of non-glandular trichomes.
Highlights
Moldavian dragonhead (Dracocephalum moldavicum L.) is native to the Himalayas and southern Siberia
Research has been conducted on the micromorphology, ultrastructure and phytochemical characters of the trichomes found in different plant species of this family (BiniMaleci et al 1992; Schulze et al 1992; Ozkan and S o y, 2007; Giuliani and MaleciBini, 2008)
Under the influence of the accumulated secretion, the cuticle layer became bulged and the striae stretched (Fig. 1C) on the surface of the cells of this tissue, and circular or oval smooth marks were left at the apex of the papillae after the emission of the secretion (Fig. 1 B,D)
Summary
Moldavian dragonhead (Dracocephalum moldavicum L.) is native to the Himalayas and southern Siberia. It was brought to Europe in the 16th century and grown in gardens This is an annual plant, reaching 60 cm in height and with sapphire-coloured flowers, which has ornamental values. Research has been conducted on the micromorphology, ultrastructure and phytochemical characters of the trichomes found in different plant species of this family (BiniMaleci et al 1992; Schulze et al 1992; Ozkan and S o y , 2007; Giuliani and MaleciBini , 2008). The results of these studies find application in pharmacognosy and plant taxonomy. The trichome types have been used to classify plant genera and species in some families as well as to assess interspecific hybrids (E s a u , 1963)
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