Spatial distribution of sclerenchyma in leaf blades of some fescues (Festuca L., Gramineae Juss.)
Abstract
Leaf anatomical characteristics are considered as important diagnostic features for identifying grasses. Cross sections in the middle part of the leaf blades have been traditionally used for such purposes. The leaf anatomy has been of key interest in diagnostics of fescues Festuca L. because of great morphological similarity between the species, particular attention is paid to the arrangement of sclerenchyma in the middle part of the leaf blades of fescues. The lack of knowledge regarding the spatial distribution of tissue throughout the leaf blades of grasses does not allow to evaluate the diagnostic significance of data obtained from the single two-dimensional cross section. The aim of the work is to make 3D models of sclerenchyma from serial sections of leaf blades of two narrow-leaved fescues Festuca valesiaca Gaud. and Festuca beckeri (Hack.) Trautv. We also attempted to find out the quantitative patterns of the distribution of sclerenchyma along the leaf blades of F. beckeri and F. valesiaca. Cross-sectional areas of sclerenchyma increase just above the blade/ sheath junction and then gradually decrease up to tips of the leaf blades in both species. Subepidermal sclerenchyma of the fescues arranges in uneven layer. The layer of F. beckeri is more or less solid, the layer of F. valesiaca is dissected by four long splits. Changes in the shape of sclerenchyma sections along the leaf blades are more pronounced in F. valesiaca than in F. beckeri. Variability of the sclerenchyma arrangements along the leaf blades should be considered when using 2D sections of the leaf for diagnostics of fescues.
About the Authors
E. V. Goremykina
Institute of Nature Sciences, Volgograd State University
Russian Federation
Universitetskiy prosp. 100, Volgograd, 400062
Russian Federation
Universitetskiy prosp. 100, Volgograd, 400062
A. A. Ryabysheva
Institute of Nature Sciences, Volgograd State University
Russian Federation
Universitetskiy prosp. 100, Volgograd, 400062
Russian Federation
Universitetskiy prosp. 100, Volgograd, 400062
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Review
For citations:
Goremykina E.V., Ryabysheva A.A. Spatial distribution of sclerenchyma in leaf blades of some fescues (Festuca L., Gramineae Juss.). Vestnik Moskovskogo universiteta. Seriya 16. Biologiya. 2019;74(3):163-169. (In Russ.)
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