Yellow-green algae , in the literature there is also a variant of Yellow-green algae ( lat.Xanthophyceae , or Xanthophyta ), or Multiple-weed algae ( lat. Heterocontae ), or tribophytic ( lat. Tribophyceae ) - a class of algae whose chloroplasts are colored yellow-yellow color. Representatives are unicellular, colonial and multicellular, mainly freshwater organisms. Like golden algae , the division of yellow-green into classes is based on the diversity of the morphological organization of thallus .
| Yellow green algae | |||||||||||
 Botydium granulatum | |||||||||||
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| International scientific name | |||||||||||
Xanthophyceae P. Allorge ex Fritsch , 1935 | |||||||||||
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Content
- 1 Features
- 2 Ecology
- 3 Role in nature and human life
- 4 See also
- 5 notes
- 6 Literature
Features
- there is one small nucleus in the cell (however, there are also multinucleated species); several disk-trough, ribbon, cupped, lamellar or stellate chloroplasts , usually yellow-green
- pigments - chlorophylls a and c; α- and β-carotenes (prevail, which determines the specific color); xanthophylls : lutein , violaxanthin , neoxanthin
- spare nutrients - oils, some - volutin , chrysolaminarin and leukosin
- monadic forms and zoospores have two unequal flagella, differing not only in length, but also morphologically: on the main flagellum there are feathery ciliated hairs, and the lateral flagellum is bicheniform
- in mobile forms, a bright red eye is usually located at the end of one of the chloroplasts
- few species have one or two contractile vacuoles
- vegetative propagation - by simple division or decay of a colony or multicellular thallus
- asexual reproduction - by bicarbon zoospores or autospores , less often - amoeboid
- the sexual process is known in few species, mainly in the form of iso- and oogamy.
Ecology
Yellow-green algae are predominantly inhabitants of clean fresh water bodies of temperate latitudes, are also common in soil, less commonly found in seas and salt lakes. Often live in clusters of filamentous algae and higher aquatic plants along the banks of rivers, ponds, lakes and reservoirs. In the aquatic environment, they are part of plankton , less commonly, periphyton and benthos .
Role in nature and human life
- organic matter producers
- sludge and sapropel formation
- water pollution indicators
- in soils participate in the processes of accumulation of organic substances and contribute to increasing soil fertility
See also
- Vosheria
Notes
- ↑ According to EOL. See the card.
Literature
- Plant life. In 6 t. / Ch. ed. Al A. Fedorov . - M .: Education, 1977. - T. 3. Algae . Lichens . Ed. M. M. Gollerbach . - 487 p. - 300,000 copies.
- "Course of Lower Plants", ed. M.V. Gorlenko - M .: "Higher School", 1981
- V. A. Kryzhanovsky, G. L. Bilich “Biology. Full course. In 3 vols. Volume 2. Botany. ”- M.: Publishing House ONIX 21 Century LLC, 2002
- "Small workshop on lower plants" - M .: "Higher school", 1976
- N. P. Gorbunova "Algology", Moscow: "Higher School", 1991