The results of a study
conducted by light microscopy of the anatomical structure of the leaf in ephemeral species from the family Brassicaceae growing
under the conditions of Kyzylkum (Uzbekistan) are presented. The following
diagnostic, structural adaptive features were revealed: a leaf lamellar,
dentate (Diptychocarpus
strictus), in Leptaleum filifolium—valky.
It is pubescent with various types of trichomes: stellate, dendroid (Meniocus linifolius), equilateral (Streptoloma desertorum) and unequal (Strigosella, Leptaleum filifolium species), unicellular hooked (Leptaleum filifolium). Epidermal cells
flattened with wavy or winding walls. The stomata are numerous, not submerged, anomocytic,
hemiparacytic, anisocytic types are noted. In all species, the isolate-palisade
type of leaf mesophyll predominates. Vascular bundles of all species are
sclerified. The main protective features of the leaf of species of the family
Brassicaceae are pubescence and sclerification of vascular bundles. We consider
the mesomorphic and xeromorphic lines of development ancient and independent.
Identified and described signs that can be used in taxonomy and ecology.
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