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Planktothrix

Generic name: PLANKTOTHRIX Anagnostidis et Komárek, 1988. Algolog. Stud. 50-53: 414.
Synonyms:
Diagnosis:
Type species: Planktothrix agardhii (Gomont) Anagnostidis et Komárek 1987
Descriptions:
Komárek (1992): Filaments solitary, rarely in small irregular and easy disintegrating fascicles (groups) (in the mass developments), more or less straight or slightly waved, isopolar, free living; usually growing without sheath. Sheaths occur facultatively in several species, in typical planktic species only under unfavourable conditions; they are fine, thin, colourless, joined to the trichome, opened at the apex. Trichomes with cylindrical; cells, slightly constricted at the cross walls, sometimes slightly tapering to the ends, up to 4 mm long, 3.5-10 um wide; occasionally with slight movement (trembling).Cells slightly shorter than wide up to +/- isodiametric, rarely Slightly longer than wide, with aerotopes through the whole cell volume (but sometimes without gas vesicles in parts of trichomes); end cells (when fully developed) widely rounded or slightly narrowed and with thickened outer cell wall or with calyptra. Without chromatic adaptation, with +/- constant phycobilin ratios. Presence of carotenoids myxoxanthophyll and oxillaxanthin. False branching, heterocytes and akinetes absent.
Genotype differences, molecular data:
Reproduction strategies, life cycles, cell division:
Komárek (1992): Cell division crosswise,the cells grow to the original size before the next division. Meristematic zones irregular
(?). Reproduction by trichome disintegration into hormogonia, by help of necridic cells.
Ultrastructure:
Taxonomic position, higher hierarchy:
Cyanophyceae, Oscillatoriales, Phormidiaceae, Phormidioideae
Notes to taxonomy, misinterpretations:
Ecology, ecophysiology, ecological significance:
Komárek (1992): Almost all species are planktic, few
of them causing the water blooms, mainly in mesotroph or slightly eutrophised
up to eutrophic reservoirs (usually lakes). One species (Pl. cryptovaginata)
grows in metaphyton of unpolluted pools and ponds among submerse water plants.
Two species have cosmopolite distribution, another ones are geographically
limited, mainly occurring under special ecological situations; two species
are known from tropical countries only.
Physiology and biochemistry:
Distribution, endemism, problematic citations:
Reference strain:
Infrageneric scheme, species concept:
List of species:
Planktothrix agardhii (Gomont) Anagnostidis et Komárek 1988
Planktothrix arnoldii (Kiselev) Anagnostidis et Komárek 1988
Planktothrix clathrata (Skuja) Anagnostidis et Komárek 1988
Planktothrix compressa (Utermöhl) Anagnostidis et Komárek 1988
Planktothrix cryptovaginata (Škorbatov) Anagnostidis et Komárek 1988
Planktothrix geitlerii (Kiselev) Anagnostidis et Komárek 1988
Planktothrix isothrix (Skuja) Komárek et Komárková 2004
Planktothrix planktonica (Elenkin) Anagnostidis et Komárek 1988
Planktothrix prolifica (Greville ex Gomont) Anagnostidis et Komárek 1988
Planktothrix pseudagardhii Suda et al. 2002
Planktothrix rubescens (de Candolle ex Gomont) Anagnostidis et Komárek 1988
Planktothrix suspensa (Pringsheim) Anagnostidis et Komárek 1988
Planktothrix zahidii (Faridi et Ghalil) Anagnostidis et Komárek 1988

Unclear taxa:
Oscillatoria baltica Eberly 1966
Oscillatoria lutescens Pankow et Jahnke 1964
Oscillatoria mehrai Vasishta 1963
Oscillatoria miyadii Negoro 1943
Oscillatoria pseudomougeotia Vasishta 1962
Oscillatoria rileyi Drouet 1944
Oscillatoria rubescens f. ahmedabadensis Kamat 1962
Oscillatoria setigera Aptekar' 1928
Oscillatoria subbrevis Schmidle sensu Haughey 1969

Keys:
List of stains:
Drawings:
Kommárek 1992
Application technology:
Literature:
  2.1 taxonomy: Anagnostidis et Komárek 1987, Komárek 1992
  2.2 cytomorphology:
  2.3 16S rRNA sequencing:
  2.4 biology and life cycles:
  2.5 ecology: