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GROWTH INTERACTIONS BETWEEN CHLAMYDOMONAS GLOBOSA SNOW AND CHLOROCOCCUM ELLIPSOIDEUM DEASON AND BOLD: THE ROLE OF EXTRACELLULAR PRODUCTS
Author(s) -
Kroes H. W.
Publication year - 1972
Publication title -
limnology and oceanography
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.7
H-Index - 197
eISSN - 1939-5590
pISSN - 0024-3590
DOI - 10.4319/lo.1972.17.3.0423
Subject(s) - extracellular , chlamydomonas , chemistry , extracellular polysaccharide , extracellular polymeric substance , polysaccharide , pigment , botany , biochemistry , algae , biology , bacteria , organic chemistry , biofilm , genetics , mutant , gene
Extracellular substances were isolated from Chlorococcum culture filtrates and the four salt‐free groups of substances obtained tested separately on Chlamydomonas growth. The group of steam‐volatile substances had an overall promoting effect. The lipophilic group inhibited growth initially but had no lasting effect. The yellow, water‐soluble pigments (phenolic compounds) could act as chelating substances. The high molecular weight fraction (proteins and polysaccharides) promoted growth in the initial phase but had an inhibiting effect later on. These effects observed were mostly small but statistically significant. In algal interactions, inhibition phenomena are not likely to be caused by strong “antibiotic” substances. Factors such as pH may be more important than extracellular compounds as such.

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