Ultrastructural features of Rhodophyta from the Black Sea Coast

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Article Title:	Ultrastructural features of Rhodophyta from the Black Sea Coast
Authors:	Elena Doroftei, Manuela Rotaru-Stăncic, Liliana Miron
Affiliation:	Faculty of Natural and Agricultural Science, “Ovidius” University, Constantza, Romania
Abstract:	An important component of the oceanic and marine vegetation is represented by the algae, among which the macrophytes ones are an important link in the trophic net and an important biologic resource. The present paper reports the results of our research of the morphology and ultrastructure of Polysiphonia denudata (Dillw.) And Ceramium rubrum (Huds). And completes a series of papers on the comparative ultrastructure of some Chlorophyta, Rhodophyta and Phaeophyta from the Romanian Black Sea Coast. Strips of thalli were cut out of the algal thallus from different regions: basal, middle and apical region. In light microscopy we used fresh thalli sectioned and observed at a Biorom photonic microscope, without colorants. Also, thin sections from algal thalli were processed by the electron microscopic technique through transmission and were observed under the performing electronic microscope Philips CM120. In our light microscope observations the branched filamentous habit is characteristic for both species studied. At the ultrastructural level the most distinctive features comparatively analyzed are: possession of simple plastids with unstacked thylakoids, two layered chloroplast envelope, lack of chloroplasts ER, pit-connection or pit plug, floridean starch as the storage product, which lies freely in the cytoplasm, the thallus heaving unicleate cells, the nucleus being small and with one or two nucleoli and cell wall composed of cellulose with the fibrils randomly arranged.
Keywords:	algae, Polysiphonia denudata, Ceramium rubrum, thallus, chloroplast, thylakoid, floridean starch, pit plug
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*Correspondence:	Elena Doroftei, Faculty of Natural and Agricultural Science, “Ovidius” University, Constantza, no. 124 Mamaia Blv., Constantza, 900527, Romania, Tel. +40-(241)-614576-interior 39, email: edoroftei2000@yahoo.ca