descripción ultraestructural de euglena pailasensis (euglenozoa) del volcán rincón de la vieja, guanacaste, costa rica

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ID: 132039
2004
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Abstract
Los euglenoides son eucariotas unicelulares flagelados que habitan ambientes acuáticos y suelos de una gran diversidad de ecosistemas. Este trabajo presenta la descripción morfológica ultraestructural del euglenoide E. pailasensis aislado de las fuentes de lodo caliente de las "pailas de barro" en el Volcán Rincón de la Vieja, Guanacaste, Costa Rica. La temperatura de estos sitios puede variar entre 38 y 98° C y puede tener un pH entre 1 y 4. El estudio se realizó utilizando microscopia electrónica de barrido y transmisión. El euglenoide está constituido por una célula típica que puede medir de 30 a 45 µm de largo y 8-10 µm de ancho, con membrana externa, película, cloroplastos, mitocondrias, núcleo, pigmentos granulares y demás organelas citoplasmáticas de un eucarionte. Esta delimitado por una membrana continua y por una película compuesta de aproximadamente 40 - 90 mionemas que miden entre 0.8 y 1.0 µm de ancho, dispuestas helicoidalmente sobre la célula. Se observó 5 cloroplastos elongados por célula, de 1-2 µm de diámetro y 6-12 µm de largo, delimitados por tres membranas y localizados en la periferia celular. Este posee glóbulos osmiofílicos y un pirenoide penetrado por pocos tilacoides. El material nutritivo se almacena en gránulos de paramilón y las mitocondrias presentan las crestas en disposición radial hacia el interior del lumen. La zona de la ámpula se observó sin flagelo y se notó una red de fibrillas que envuelve el espécimen. Las características ultraestructurales observadas en este estudio, no permiten explicar la capacidad de E. pailasensis para habitar en el ambiente volcánico extremo de las Pailas de Barro Caliente
The euglenoids are unicellular eukaryotic flagellates living in a diversity of soils and aquatic environments and ecosystems. This study describes the ultrastructure of an euglenoid isolated from the surface of a boiling mud pool with temperatures ranging from 38 to 98°C and pH 2 - 4. The hot mud pool is located in Area de Pailas de Barro, Las Pailas, Rincón de la Vieja Volcano, Guanacaste, Costa Rica. The morphological characterization of the Euglena pailasensis was performed by SEM and TEM. It was determined that, although the euglenoid was obtained from an extreme volcanic environment, the general morphology corresponds to that of a typical member of Euglena of 30-45 µm long and 8-10 µm wide, with membrane, pellicle, chloroplasts, mitochondria, nucleus, pigments and other cytoplasmic organelles. E. pailasensis is delimited by a membrane and by 40 to 90 pellicle strips. It was observed up to 5 elongated chloroplasts per cell. The chloroplast contains several osmiophilic globules and a pyrenoid penetrated by few thylakoid pairs. The nutritious material is reserved in numerous small paramylon grains located at the center of the cell, mitocondria are characterized by the presence of crests in radial disposition toward the interior of the lumen. It was also observed around the external surface "pili" like filaments originating from the pellicle strips. There is no evidence for the presence of flagella in the ampulla (reservoir/canal area), a fact confirmed by negative staining, and a difference regarding other species of Euglena. The observed ultrastructural characteristics are not sufficient to explain the adaptation of this species to acid and hot environments
Reference Key
snchez2004revistadescripcin Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ethel Sánchez;Maribel Vargas;Marielos Mora;José María Ortega;Aurelio Serrano;Enrique Freer;Ana Sittenfeld
Journal science journal of university of zakho
Year 2004
DOI
DOI not found
URL
http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77442004000100006
Keywords
protozoa ultrastructure euglena

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