Structural features of vegetative organs of Oxytropis macrodonta Gontsch. (Leguminosae) in natural conditions

¹ Tashkent State Pedagogical University, Tashkent, 100070, Uzbekistan
² Institute of the Chemistry of Plant Substances, Tashkent, 100170, Uzbekistan

^* Corresponding author: guljon.duschanova@mail.ru

Abstract

For the first time, the anatomical structure of the vegetative organs of Oxytropis macrodonta, which grows in natural habitats, has been studied. The following diagnostic and adaptive features were revealed: in the leaf, a more sinuous outline of the epidermal cells; unsubmerged stomata of anomocytic and hemiparacytic type; dorsiventral type of leaf mesophyll; palisade and spongy parenchyma chlorophyll-bearing; in peduncles - parenchymal-beam type of structure; under the epidermis there is a numerous lamellar collenchyma; conducting bundle open collateral type and sclerified due to bast fibers; the root is of a non-beam type and more woody, the elements of which are primary bast fibers; inside from the fibers there is a secondary bast or secondary phloem, which makes up the zone of the secondary cortex; trapezoidal sections consist of lignified thick-walled cells - a hard bast with a thin-walled element - a soft bast; the libriform is extensive, the woody parenchyma is diffusely vascular. The presence and localization of biologically active substances in palisade, spongy and cortical parenchymal cells are shown. The data and the identified structural diagnostic features of aboveground and underground organs are species-specific and can be used in taxonomy and in the identification of plant materials for a given species.