Structural adaptations of grasses leaves with panicoid type of anatomy (Poaceae)
UDC 582.52/.59+581.823
Abstract
The organization of leaf mesophyll at 8 species of panicoid grasses with NADP-ME type C4 photosynthesis was studied using a light microscope on transverse and longitudinal sections. Plants of natural communities (Arundinella hirta, Spodiopogon sibiricus), weeds (Echinochloa crus-galli, Setaria viridis) and cultivated grasses (Echinochloa colonum subsp. edulis, Pennisetum americanum, Sorghum × drummondii, Zea mays) were distinguished. Anatomical studies were carried out in the middle part of the leaf blades and the upper third of the leaf sheaths located in the middle of the generative shoots. Among the mesophyll cells of the leaves, the cells of the crown sheath radially adjacent to the Kranz cells and the cells of the intercrown zone located between them were distinguished. It is shown that the mesophyll of the leaves of the considered grasses consists of cells of simple and complex cellular shapes. Cellular cells meet more often in the crown sheath compared to the intercrown zone. In leaf blades of grasses of natural cenoses, especially at Arundinella hirta, they are the most numerous, with a large number of well-defined sections. In weeds and cultivated grasses, the participation of cellular cells decreases; in their majority they consist of 2–4 sections and are often characterized as weakly cellular. In leaf sheaths the share of assimilative cells of simple form increases, most of all in weeds and cultivated grasses.
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