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Titolo:
EFFECTS OF BROMIDE AND IODIDE ON STALK SECRETION IN THE BIOFOULING DIATOM ACHNANTHES LONGIPES (BACILLARIOPHYCEAE)
Autore:
JOHNSON LM; HOAGLAND KD; GRETZ MR;
Indirizzi:
UNIV NEBRASKA,SCH BIOL SCI LINCOLN NE 68588 UNIV NEBRASKA,DEPT FORESTRY FISHERIES & WILDLIFE LINCOLN NE 68588 MICHIGAN TECHNOL UNIV,DEPT BIOL SCI HOUGHTON MI 49931
Titolo Testata:
Journal of phycology
fascicolo: 3, volume: 31, anno: 1995,
pagine: 401 - 412
SICI:
0022-3646(1995)31:3<401:EOBAIO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
MARINE FOULING DIATOM; PRIMARY-CELL WALL; VANADIUM BROMOPEROXIDASE; AMPHORA-COFFEAEFORMIS; PHENOLIC COMPONENTS; CHAETOCEROS-AFFINIS; ICE ALGAE; GROWTH; POLYSACCHARIDES; PHYTOPLANKTON;
Keywords:
ACHNANTHES LONGIPES; BACILLARIOPHYCEAE; BIOFOULING; BROMIDE; DIATOM; EPS SECRETION; IMAGE ANALYSIS; INHIBITION OF ADHESION; IODIDE; LOTUS-FITC; STALKS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
76
Recensione:
Indirizzi per estratti:
Citazione:
L.M. Johnson et al., "EFFECTS OF BROMIDE AND IODIDE ON STALK SECRETION IN THE BIOFOULING DIATOM ACHNANTHES LONGIPES (BACILLARIOPHYCEAE)", Journal of phycology, 31(3), 1995, pp. 401-412

Abstract

Extracellular polymeric substance (EPS) secretion was examined in thestalked marine diatom Achnanthes longipes Ag. in defined medium. Thiscommon biofouling diatom exhibited an absolute requirement for bromide for stalk production and substratum attachment, whereas elevated iodide concentrations in the growth medium inhibited stalk formation and adhesion. Varying EPS morphologies resulted from altering bromide and iodide levels: pads, stalk-pads, stalks, and no EPS. Cells showed no differences in growth with bromide or iodide concentrations, indicatingthat they were not physiologically stressed under conditions that impaired EPS secretion. Cells grown in elevated iodide secreted significantly more soluble extracellular carbohydrate into the medium, suggesting that the EPS was soluble and unable to be polymerized into a morphologically distinct gel. By replacing sulfate with methionine, the diatom lost its ability to form stalks even in the presence of bromide indicating that free sulphate may be required for proper cross-linking ofstalk polymers. Lotus-FITC, a fluorescent-tagged lectin, preferentially labeled the EPS and, thus, was used to visualize and quantify EPS secretion along a bromide gradient in conjunction with an image analysis system. This technique demonstrated a direct correlation between theamount of bromide present in the medium and the specific EPS morphology formed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 14:48:42