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Titolo:
EFFECT OF AMMONIUM AND NITRATE ON N-15(2)-FIXATION OF AZOSPIRILLUM SPP. AND PANTOEA-AGGLOMERANS IN ASSOCIATION WITH WHEAT PLANTS
Autore:
RUPPEL S; MERBACH W;
Indirizzi:
INST VEGETABLE & ORNAMENTAL CROP PROD GROSSBEEREN,THEODOR ECHTERMEYERWEG 1 D-14979 GROSSBEEREN GERMANY
Titolo Testata:
Microbiological research
fascicolo: 4, volume: 152, anno: 1997,
pagine: 377 - 383
SICI:
0944-5013(1997)152:4<377:EOAANO>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
N-15 NATURAL-ABUNDANCE; NITROGEN-FIXATION; ISOTOPE-DILUTION; MINERAL UPTAKE; GROWTH; TRANSLOCATION; INOCULATION; RHIZOSPHERE; CULTURE;
Keywords:
DIAZOTROPHIC BACTERIA; DINITROGEN FIXATION; PLANT BACTERIA ASSOCIATION; N-15(2)-ENRICHMENT; AMMONIA AND NITRATE FERTILIZATION; AZOSPIRILLUM SPP.; PANTOEA AGGLOMERANS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
S. Ruppel e W. Merbach, "EFFECT OF AMMONIUM AND NITRATE ON N-15(2)-FIXATION OF AZOSPIRILLUM SPP. AND PANTOEA-AGGLOMERANS IN ASSOCIATION WITH WHEAT PLANTS", Microbiological research, 152(4), 1997, pp. 377-383

Abstract

The dinitrogen fixing ability of two diazotrophic bacterial strains Pantoea agglomerans and Azospirillum spp. which are proved to express N-2-fixing activity in presence of additional inorganic nitrogen sources was tested in association with wheat plants in hydroponic experiments using N-15(2) incubation. The effect of 100 ppm nitrogen added as NH4Cl or KNO3 to wheat plants on dinitrogen fixing activity of native aswell as inoculated bacteria was determined. Enrichment of N-15, that means fixed dinitrogen, was detected in plant growth media, in roots and shoots of wheat plants grown 26 days in N-15(2) enriched atmosphere. Highest N-15 amounts were found in wheat shoots. As well as the formof nitrogen applied and the bacterial strain inoculated effected plant growth, nitrogen uptake and the amount of biologically fixed dinitrogen. Ammonia or nitrate supply to plants did not repress N-15(2) fixation. Distribution of N-15 within the plant and media was mainly influenced by the inoculated bacterial strain. The detected dinitrogen fixing ability in presence of inorganic nitrogen of both bacterial strains in pure culture was confirmed even in association with wheat plants. That finding offers the possibility to select diazotrophic bacterial strains in pure culture which are able to fix dinitrogen in association with plants when additional inorganic nitrogen was fertilized.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 00:28:53