Abstract
Many plants develop in the petal epidermis papillae emitting essential oils. In species of the genus <em>Allium</em>, papillae occur in the ovary epidermis. The aim of this study was to determine the structure of papillae in <em>Allium karataviense </em>Regel and to perform histochemical tests that would allow the components of their secretion to be investigated, mainly the presence of essential oils. Examination was performed using light and scanning electron microscopy. It was found that in conical papillae, with a height of about 83 μm, there were large cell nuclei, a thick outer wall with a layer of striated cuticle, and a varying degree of cell vacuolation, depending on the age of the ovary. Using histochemical reactions, we demonstrated neutral lipids, acid lipids and pectins to occur in the papillae. Neutral lipids are characteristic of essential oils.
Highlights
The genus Allium includes 700 plant species
Our attention is drawn to large-sized papillae (Figs 3,4) which reach a height of 70–90 μm, while the diameter of the subepidermal parenchyma cells is 39–52 μm
The papillae are conically shaped. Their outer walls are covered with striated cuticle (Figs 5–7) and secretion residues can be seen in many places on the surface of the apical parts of the papillae, which was recorded by scanning electron microscopy (Figs 5,6)
Summary
Turkestan onion, originates from the Turkestan region It is a small plant reaching a height of 20–25 cm. The stem produces only two wide leaves with a bluish tinge and a narrow red margin They are arranged almost horizontally and their length corresponds to the height of the inflorescence peduncle [2]. Due to the ornamental features of their leaves, these plants are valued in flower beds before the flowering period This species flowers at the end of April and in May. Its silver-pink flowers are borne in a globular umbel with a diameter up to 10 cm. The inflorescence consists of 400–500 flowers [3] Because this species is characterized by beautiful fruits, it is an ornament in gardens after senescence. It is used as a component of dry bouquets [6]
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