HISTO-ANATOMICAL OBSERVATIONS REFERRING TO SOME MELAMPYRUM SPECIES
Journal Title: Analele Stiintifice ale Universitatii Alexandru Ioan Cuza din Iasi, Serie noua, Sectiunea II a. Biologie vegetala - Year 2009, Vol 55, Issue 2
Abstract
The paper presents the results of some histo-anatomical research upon 5 hemiparasite species of Melampyrum genus belonging to the Romanian flora: M. arvense L., M. bihariense A. Kerner, M. cristatum L., M. saxosum Baumg and M. sylvaticum L. The authors investigate the structure of all vegetative organs and of the haustoria, focusing on the fact that they bear xylem vessels which facilitate the transport of the crude sap from the host plant to the root of the parasite. The root passes quite early to a secondary structure, due to the activity of both lateral meristems; the stem also presents a secondary structure, due only to cambium’s activity. The mechanic tissue is present only in a few species, represented by isolated or grouped periphloemic sclerenchymatic fibers and few weak collenchymatized elements in hypodermic position. The indumentums of leaves and bracts differs in all 5 species, representing very important taxonomic criteria. The mesophyll is different in all 5 species, strongly correlated with the environment of the species.
Authors and Affiliations
ASPAZIA BĂEŞU, C. TOMA, IRINA STĂNESCU
Keywords
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