DIVISION EUGLENOPHYTA PDF

Jason Oyadomari Euglenoids are algae with a unique cell covering a pellicle , and although many species are photosynthetic, they tend to supplement photosynthesis with absorption of organic compounds and many species engulf their prey. Species within the division Euglenophyta reach their greatest abundance in small pools, stagnant waters, or ditches that have been enriched with organic compounds, often from human pollutants. They grow mostly in freshwater habitats, but they also can form large blooms in coastal marine areas in association with the presence of certain organic compounds. Therefore, while euglenoids may photosynthesize by using the pigments chlorophyll a and b, they also have the ability to absorb organic compounds.

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A moderate sized group ca. Makes sense in terms of secondary origin of plastid Food storage outside of plastid, as paramylon a beta-1,3 linked glucan granules Reproduction Sex has not been observed, and it has been argued that euglenoids diverged from the eukaryotic main series prior to the evolution of sex. It is also possible that they are descended from sexual ancestors, but have lost sex, or that they do reproduce sexually, but do so discreetly.

Classification Related to Kinetoplastida trypanosomes , but other phylogenetic affinities are unclear In SSU rRNA analyses, show up as a long branch outside of crown group, but this placement is increasingly suspect Euglena A standard research organism, used as model system and genetic system.

Not a good model for plants or animals, but an extremely interesting organism. Important in early demonstration of plastids as endosymbiotic organelles Euglena grown at high temperature will lose its plastids This provided early evidence that plastids were "special" organelles They cannot be synthesized de novo, i. Can release from the stalk, swim around, then settle and start a new colony. Phacus -- free swimming, with rigid, flattened cells.

Peranema -- colorless, perhaps primitively so. Feeds actively by either phagocytosis or myzocytosis. Petalomonas cantuscygni -- according to rRNA studies, branches before the divergence between Euglenophyta and Kinetoplastida. Ecology Often found in highly eutrophic environments Ditches and ponds near cow pastures, hog lots, chicken farms, etc. A thick green or red scum on the surface of the water is often from a euglenoid bloom Mud flats another highly productive environment are also good euglenoid hunting Very few euglenoids have been grown in axenic culture, and euglenoid culture media are generally very nutrient rich Economic Importance Although an indicator group for disgusting environmental conditions, euglenoids are generally harmless Required Reading: VdH: Chapter 17 Supplementary Reading: Hallick, R.

Hong, R. Drager, M. Favreau, A. Monfort, B. Orsat, A. Spielmann, and E. Complete sequence of Euglena gracilis chloroplast DNA.

Acids Res. Stevenson, J. The Plant J. Triemer, R. Feeding in Peranema trichophorum revisited Euglenophyta.

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DIVISION EUGLENOPHYTA

A moderate sized group ca. Makes sense in terms of secondary origin of plastid Food storage outside of plastid, as paramylon a beta-1,3 linked glucan granules Reproduction Sex has not been observed, and it has been argued that euglenoids diverged from the eukaryotic main series prior to the evolution of sex. It is also possible that they are descended from sexual ancestors, but have lost sex, or that they do reproduce sexually, but do so discreetly. Classification Related to Kinetoplastida trypanosomes , but other phylogenetic affinities are unclear In SSU rRNA analyses, show up as a long branch outside of crown group, but this placement is increasingly suspect Euglena A standard research organism, used as model system and genetic system. Not a good model for plants or animals, but an extremely interesting organism.

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euglenophyte

The latter is used for gliding along the substrate. Prey such as bacteria and smaller flagellates are ingested through a cytostomesupported by microtubules. Euglenophyta A division of typically unicellular protists, sometimes regarded as algae eugglenophyta, sometimes as protozoa class Phytomastigophora. Then, copy and paste the text into your bibliography or works cited list.

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