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Morphological differentiation in non-sulfur purple bacteria

Gorlenko, V.M.; Keppen, O.I.; Puchkov, A.N.

Mikrobiologiia 45(5): 817-824

1976

ISSN/ISBN: 0026-3656
PMID: 1004269
Document Number: 97723
Cell differentiation in non-sulphur purple bacteria is complicated, as compared to binary fission, during bud formation with production of hyphae and special resting cells of the exospore type, and can be demonstrated in the folowing series of microorganisms: Rhodopseudomonas sulfidophila leads to Rh. capsulata leads to Rh. acidophila leads to Rh. viridis and Rh. palustris leads to Rh. sulfoviridis leads to Rhodom. vannielii. Contrary to phototrophic bacteria multiplying by division, a distinct sequence in appearance of various morphological forms was found in bud-forming bacteria. Formation of specialized cells is regulated by the substrate concentration, accumulation of metabolites, and the population density. Mobile cells are not formed at all or partly, resting cells are formed sometimes at a higher rate, and vegetative cells contain reserve substances in all bud-forming phototrophic bacteria if conditions of the environment are not optimal.

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