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Titolo:
PHYSIOLOGICAL AND ELECTRON-MICROSCOPIC INVESTIGATIONS ON SYNTROPHIC DICYANDIAMIDE DEGRADATION BY SOIL BACTERIA
Autore:
SCHWARZER C; AUER B; KLIMA J; HASELWANDTER K;
Indirizzi:
INNSBRUCK UNIV,DEPT MICROBIOL,TECHNIKERSTR 25 A-6020 INNSBRUCK AUSTRIA INNSBRUCK UNIV,DEPT MICROBIOL A-6020 INNSBRUCK AUSTRIA INNSBRUCK UNIV,DEPT BIOCHEM A-6020 INNSBRUCK AUSTRIA INNSBRUCK UNIV,DEPT ZOOL & LIMNOL A-6020 INNSBRUCK AUSTRIA INNSBRUCK UNIV,DEPT PHARMACOL A-6020 INNSBRUCK AUSTRIA
Titolo Testata:
Soil biology & biochemistry
fascicolo: 3, volume: 30, anno: 1998,
pagine: 385 - 391
SICI:
0038-0717(1998)30:3<385:PAEIOS>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITRIFICATION INHIBITOR DICYANDIAMIDE; KINETICS; DCD;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
C. Schwarzer et al., "PHYSIOLOGICAL AND ELECTRON-MICROSCOPIC INVESTIGATIONS ON SYNTROPHIC DICYANDIAMIDE DEGRADATION BY SOIL BACTERIA", Soil biology & biochemistry, 30(3), 1998, pp. 385-391

Abstract

Soil bacteria with high dicyandiamide (DCD) degrading capacity were isolated. In addition to pure cultures, two different consortia of soilbacteria were shown to degrade DCD under conditions of syntrophy. Thesingle isolates of the consortia could not grow on minimal media or degrade DCD. These consortia turned out to be associations between Xanthomonas maltophilia and either Radiobacter sp. or Aureobacterium sp. Both types of consortia proliferate and degrade DCD rapidly. Supplementation experiments and microscopical investigations focusing on Xanthomonas maltophilia and Aureobacterium sp. showed that Aureobacterium sp.is probably auxotrophic for a yet unknown factor. Supplementation of minimal medium essential medium (MEM) vitamins enables this strain to grow with nitrate, but not with DCD or ammonia as single nitrogen sources. Xanthomonas maltophilia, however, is dependent on a substance which is not released into the medium by its companion. It cannot be provided either by the addition of vitamins or casamino acids or culture filtrates of proliferating consortia to the medium, but only by the presence of Aureobacterium sp. cells in the nutrient medium. Partially based on novel preparation techniques, microscopical investigations constantly showed a close contact between Xanthomonas maltophilia cells and its companion in enrichment medium, while Aureobacterium sp. is alsofound as single cells. The close contact appears to be of paramount importance to initiate growth and DCD degradation. The results demonstrate clearly the importance of investigations, including bacterial consortia in addition to pure culture studies when the degradability of agrochemicals has to be assessed. (C) 1998 Elsevier Science Ltd. All rights reserved.

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Documento generato il 25/05/20 alle ore 07:24:41