Ultrastructure of tetrasporogenesis in the red alga Rhodymenia californica var. attenuata (Rhodymeniaceae, Rhodymeniales, Rhodophyta)
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Stylianos G. Delivopoulos
Abstract
Tetrasporogenesis in Rhodymenia californica var. attenuata is accomplished in four developmental stages. The first stage is represented by a uninucleate tetraspore mother cell sourrounded by an electron transparent cell wall. Dictyosome activity and endoplasmic reticulum are not evident at this stage and starch formation does not occur. Thylakoids are formed from unraveling concentric lamellar bodies. Multiplication of plastids results from fission of the existing organelles. The tetraspore mother cell increases in size and undergoes decussate cruciate division by cleavage infurrowing, resulting in the formation of four tetraspores which represents the second stage of tetraspore development. Also, granular vesicles are formed from the endoplasmic reticulum. The third stage is characterized by the formation of fibrous vacuoles from the fibrous vacuole associated organelles. The fourth developmental stage is represented by maturation of tetraspores and is signaled by the massive production of cored vesicles from hypertrophied dictyosomes and the presence of abundant starch granules. Mature tetraspores are surrounded by a bi-layered wall and the tetrasporangial wall, while unbranched, tubular structures run parallel to the plasmalemma.
Copyright © 2004 by Walter de Gruyter GmbH & Co. KG
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Artikel in diesem Heft
- Dinoflagellate cysts in recent marine sediments from Scapa Flow, Orkney, Scotland
- Dinoflagellate cysts in recent marine sediments from the east coast of Russia
- Variation in chemical defenses against herbivory in southwestern Atlantic Stypopodium zonale (Phaeophyta)
- Seasonal variations in fatty acid composition of Caulerpa taxifolia (M. Vahl.) C. Ag. in the northern Adriatic Sea (Malinska, Croatia)
- Chemical composition and biological activity of the brackish-water green alga Cladophora rivularis (L.) Hoek
- Ultrastructure of tetrasporogenesis in the red alga Rhodymenia californica var. attenuata (Rhodymeniaceae, Rhodymeniales, Rhodophyta)
- Organisation of the microtubular cytoskeleton in protoplasts from Palmaria palmata (Palmariales, Rhodophyta)
- Thalassiosira fryxelliae nov. spec. (Bacillariophyceae) from Argentinian coastal waters
- Short-term uptake of dissolved organic nitrogen by an axenic strain of Ulva pertusa (Chlorophyceae) using [15]N isotope measurements
- The occurrence of Boodleopsis vaucherioidea Calderón-Sáenz et Schnetter (Udoteaceae, Chlorophyta) in Brazil
- First record of Undaria pinnatifida (Harvey) Suringar (Laminariales, Phaeophyta) on the Pacific coast of Mexico
- World atlas of seagrasses
- The genus Dictyota (Dictyotales, Phaeophyta) in the Indian Ocean
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