Anatomical-morphological changes in Glyceria aquatica (L.) Wahlb. and Phalaris arundinacea L. growing in the zone inundated by the Kwiecko lake

Abstract

Morphological-anatomical changes are described in the shoots of Glyceria aquatica and Phalaris arundinacea. These grasses encroach upon the zone inundated by the lake Kwiecko which is the lower reservoir of the Hydroelectric Plant Żydowo. The interaction of habitat and anthropogenic factors causes disturbances in the physiology of reproduction in the above mentioned plants and produces changes in their external and internal structure. Both species form in the zone inundated by the lake vegetative shoots exclusively, with profuse aerial tillering at the apical meristems. The morphological changes consist in shortening of the shoots and multiplication of the internodes. In the internal structure a narrowing of the ring of sclerenchyma, a shift of the vascular bundles into the sclerenchyma and an increase of its layer and air channels are observed.