Chlamydomonas

Chlamydomonas
Chlamydomonas
SEM image of flagellated Chlamydomonas (10000×)
Scientific classification
Kingdom: Protista
Division: Chlorophyta
Class: Chlorophyceae
Order: Volvocales
Family: Chlamydomonadaceae
Genus: Chlamydomonas
Ehrenb.
Species

See text

Chlamydomonas is a genus of green alga. They are unicellular flagellates. Chlamydomonas is used as a model organism for molecular biology, especially studies of flagellar motility and chloroplast dynamics, biogenesis, and genetics. One of the many striking features of Chlamydomonas is that it contains ion channels that are directly activated by light, such as channelrhodopsin. Some regulatory systems of Chlamydomonas are more complex than their homologs in Gymnosperms, with evolutionary related regulatory proteins being larger and containing additional domains [1].

Drawings of Chlamydomonas caudata Wille.[2]
Light micrograph of Chlamydomonas without flagella

Contents

Species

Nutrition

Most species are obligate phototrophs but C. reinhardtii and C. dysosmos are facultative heterotrophs that can grow in the dark in the presence of acetate as a carbon source.

Morphology

  • Motile unicellular alga.
  • Generally oval in shape.
  • Cellulosic Cell wall.
  • Two anteriorly inserted whiplash flagella. Flagella originates from a basal granule located in the anterior papillate or non-papillate region of the cytoplasm. Flagellum shows typical 9+2 arrangement of the component fibrils.
  • Contractile vacuoles found at near the bases of flagella.
  • Prominent cup or bowl shaped chloroplast is present. The chloroplast contains bands composed of a variable number of the photosynthetic thylakoids which are not organised into grana-like structures.
  • Pyrenoid with starch sheath is present in the posterior end of the chloroplast.
  • Eye spot present in the anterior portion of the chloroplast. It consists of two or three, more or less parallel rows of linearly arranged fat droplets.

References

  1. ^ A Falciatore, L Merendino, F Barneche, M Ceol, R Meskauskiene, K Apel, JD Rochaix (2005). The FLP proteins act as regulators of chlorophyll synthesis in response to light and plastid signals in Chlamydomonas. Genes & Dev, 19:176-187 [1]
  2. ^ Hazen, Tracy E. 1922. The phylogeny of the genus Brachiomonas. Bulletin of the Torrey Botanical Club. 49(4):75-92, with two plates.
  3. ^ Aoyama, H., Kuroiwa, T and Nakamura,S. 2009. The dynamic behaviour of mitochrandia in living zygotes during maturation and meiosis in Chlamydomonas reinhardtii. Eur. J. Phycol. 44: 497 - 507

External links


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Chlamydomonas — Chlamydomonas …   Wikipédia en Français

  • Chlamydomonas — sp. Systematik ohne Rang: Chloroplastida Abteilung: Chlorophyta …   Deutsch Wikipedia

  • chlamydomonas — ● chlamydomonas nom féminin Algue unicellulaire d eaux douces, très commune, munie de deux flagelles lui permettant une nage active. chlamydomonas [klamidɔmɔnas] n. f. ÉTYM. 1845, sous la forme chlamydomonade; lat. sc., du grec khlamus, udos (→… …   Encyclopédie Universelle

  • Chlamydomonas — n. the type genus of the {Chlamydomonadaceae}; they are solitary biflagellated plantlike algae common in fresh water and damp soil. They multiply freely and are often a pest around filtration plants. Syn: genus {Chlamydomonas}. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • Chlamydomonas —   [ç ], einzellige, zweigeißlige Grünalgengattung aus der Ordnung der Volvocales; der grüne Chloroplast trägt einen Augenfleck; einige Arten können durch Sekundärcarotinoide rot gefärbt sein. Chlamydomonas kommt im Süß , Meerwasser und im Boden… …   Universal-Lexikon

  • Chlamydomŏnas — Chlamydomŏnas, Geschlecht der Räderthierchen; ohne Schwanz, 2 Rüssel, 1 Auge; Art: Ch. pulvisculus, eiförmig, grün, Auge roth, krugförmige Hülle, färbt im Frühjahr u. Herbst die Wasserbehälter grün …   Pierer's Universal-Lexikon

  • Chlamydomonas — Chlamydomonas …   Wikipédia en Français

  • Chlamydomonas —   Chlamydomonas …   Wikipedia Español

  • Chlamydomonas — Genus of single celled green algae considered to be primitive life forms of evolutionary significance. The cell has a spherical cellulose membrane, an eyespot, and a cup shaped, pigment containing chloroplast. Though capable of photosynthesis,… …   Universalium

  • chlamydomonas — [ˌklamɪdə məʊnəs] noun Biology a common single celled green alga living in water and moist soil. [Genus Chlamydomonas.] Origin C19: mod. L., from Gk khlamus, khlamud cloak + monas (see monad) …   English new terms dictionary

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”