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Titolo:
Studies on nitric oxide (NO) formation by the green alga Scenedesmus obliquus and the diazotrophic cyanobacterium Anabaena doliolum
Autore:
Mallick, N; Rai, LC; Mohn, FH; Soeder, CJ;
Indirizzi:
KFA Julich GmbH, Forschungszentrum, Inst Chem & Dynam Geosphare 6, D-52425Julich, Germany KFA Julich GmbH Julich Germany D-52425 osphare 6, D-52425Julich, Germany Banaras Hindu Univ, Dept Bot, Varanasi 221005, Uttar Pradesh, India Banaras Hindu Univ Varanasi Uttar Pradesh India 221005 tar Pradesh, India
Titolo Testata:
CHEMOSPHERE
fascicolo: 10, volume: 39, anno: 1999,
pagine: 1601 - 1610
SICI:
0045-6535(199910)39:10<1601:SONO(F>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITRATE; ASSIMILATION; BACTERIA; PLANTS; CARBON; LIGHT;
Keywords:
Scenedesmus obliquus; Anabaena doliolum; nitric oxide (NO); nitrate reductase (NR); nitrite reductase (NiR);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Mallick, N KFA Julich GmbH, Forschungszentrum, Inst Chem & Dynam Geosphare6, D-52425Julich, Germany KFA Julich GmbH Julich Germany D-52425 D-52425Julich, Germany
Citazione:
N. Mallick et al., "Studies on nitric oxide (NO) formation by the green alga Scenedesmus obliquus and the diazotrophic cyanobacterium Anabaena doliolum", CHEMOSPHERE, 39(10), 1999, pp. 1601-1610

Abstract

This study provides preliminary evidence that NO production could be a general attribute of algae. Anabaena doliolum was found to be a better NO producer than Scenedesmus and Synechoccocus. Experiments conducted with inhibitors of photosynthesis (DCMU), ATP synthesis (DCCD), and the uncoupler (2,4-DNP) and its analog arsenate clearly revealed that inhibition of nitrite assimilation through the blockage of nitrite reductase (NiR) is primarily responsible for NO emission. A linear relationship between nitrite concentration in the culture medium and NO in the exhaust gas supports the view that accumulation of nitrite is responsible for NO formation. A failure of Scenedesmus, grown in the medium substituted with W for Mo, to produce either NO / NO2- in light or a 'light-off' peak, and a resumption of these activitiesupon the addition of Mo proved beyond doubt that a functional nitrate reductase (NR) is necessary for the production of nitrite and NO by algae grownon nitrate as the nitrogen source. Moreover, the appearance of a NO peak immediately after nitrite supplementation under dark conditions in W-substituted cultures with or without glucose ruled out an enzymatic role of NR in NO emission. (C)1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/10/20 alle ore 01:26:03