Prochlorothrix hollandica Burger-Wiersma, Stal & Mur 1989
Publication Details
Prochlorothrix hollandica Burger-Wiersma, Stal & Mur 1989: 256, fig. 1,2,6
Published in: Burger-Wiersma, T., Stal, L.J. & Mur, L.R. (1989). Prochlorothrix hollandica gen. nov., sp. nov., a filamentous oxygenic photoautotrophic procaryote containing chlorophylls a and b: assignment to Prochlorotrichaceae fam. nov. and order Prochlorales Florenzano, Balloni, and Materassi 1986, with emendation of the ordinal description. International Journal of Systematic Bacteriology 39(3): 250-257.
Request PDFType Species
This is the type species (holotype) of the genus Prochlorothrix.
Status of Name
This name is of an entity that is currently accepted taxonomically.
Type Information
Type locality: Isolated from a shallow, highly eutrophic freshwater lake in The Netherlands.; (Burger-Wiersma, Stal, & Mur 1989: 256) Notes: "The type strain has been deposited in the Culture Collection of Algae and Protozoa (Cumbria, United Kingdom) as strain CCAP 1490/1."
General Environment
This is a freshwater species.
Description
Filamentous organism composed of cylindrical cells that
are 0.5 to 1.5 µm wide and 3 to 10 µm long. Unfavorable
growth conditions may increase both the cell length and the
cell diameter. The straight undifferentiated trichomes are
composed of 2 to more than 100 cells, depending on the
degree of shearing that occurs as a result of stirring liquid
cultures. The trichomes lack sheaths, do not possess differentiated
end cells, and are nonmotile. The cell wall is
characterized by both gram-positive and gram-negative features.
Periodic constrictions along the trichomes mark the
locations of cross walls between adjacent cells. The cross
walls are formed by invagination of the cytoplasmic membrane
and the peptidoglycan layer of the cell wall. The outer
layer of the cell wall does not participate in cross wall formation. Reproduction occurs by trichome fragmentation;
motile hormogonia are not produced.
The thylakoid membranes are arranged in parallel layers at
the periphery of the cytoplasm around a thylakoid-free
central body. The thylakoid membranes show lateral
heterogeneity. Refractile cell inclusions
of indefinite nature may be present. Gas vacuoles are
present at the polar ends of the cells. Carboxysomes seem to
be restricted to the center of the cells in the vicinity of the
thylakoid membranes. The nuclear region is located in the
center of the cells (2).
The primary photosynthetic pigments, chlorophylls a and
b, have a ratio of chlorophyll a to chlorophyll b ranging from
7:l to 19:l. Zeaxanthin and p-carotene are the major carotenoids;
a-carotene, lutein, and echinenon are absent. Dinitrogen
fixation does not occur in media devoid of combined
nitrogen, nor can nitrogenase activity be induced under
anaerobic conditions. Salt sensitive; 25 mM NaCl inhibits
growth, and no growth occurs at 100 mM NaC1. The optimum
growth temperature is between 20 and 30°C, and the
optimum pH is 8.4.
Created: 22 January 2004 by M.D. Guiry.
Last updated: 19 February 2023
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Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=62124
Citing AlgaeBase
Cite this record as:
Salvador Valenzuela Miranda in Guiry, M.D. & Guiry, G.M. 19 February 2023. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 04 May 2024
