PJB-2025-242
Micromorphological and quantitative characterisation of leaves of wild growing Pyrus communis L. (Rosaceae)
Kumachova Tamara Kh.
Abstract
The surface micromorphology of mature leaves of Pyrus communis L., as well as leaf structures at the bud stage, were studied by light digital and scanning electron microscopy. On leaf blades and stipules, secretory structures were found in the form of long finger-like formations - colleters on apical and lateral teeth. On the adaxial and abaxial surfaces of the leaf blades, cuticular folds were found, which were more developed in the area of stomata and on the veins. The leaf blades are hypostomatous, the stomata are closer to the stephanocytic type. Stomatal dimorphism was already manifested at the bud stage of lamina development: larger single primary stomata with pronounced radial cuticular folds were surrounded by smaller secondary (normal) stomata. A variety of leaf size and shape was observed in the samples from different regions of southern Russia, the Caucasus and the Crimea. Factor analysis revealed 2 main factors combining the correlated variables: the factor of leaf size parameters (petiole length, leaf blade length and width) and the factor of leaf morphological characteristics (apex elongation, edge shape and leaf blade shape).
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