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Titolo:
THE IMPACT OF OZONE ON THE N-15 INCORPORATION AND NITROGEN ASSIMILATION OF WHEAT AND MAIZE
Autore:
MOCKER D; HOFMANN D; JUNG K; BENDER J; WEIGEL HJ;
Indirizzi:
UNIV HALLE WITTENBERG,INST BIOCHEM,FACHBEREICH BIOCHEM BIOTECHNOL,KURT MOTHES STR 3 D-06120 HALLE GERMANY UFZ LEIPZIG HALLE GMBH,SEKT CHEM OKOTOXIKOL LEIPZIG GERMANY BUNDESFORSCH ANSTALT LANDWIRTSCHAFT BRAUNSCHWEIG BRAUNSCHWEIG GERMANY
Titolo Testata:
Isotopes in environmental and health studies
fascicolo: 2-3, volume: 32, anno: 1996,
pagine: 181 - 190
SICI:
1025-6016(1996)32:2-3<181:TIOOOT>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
OPEN-TOP CHAMBERS; SPRING WHEAT; TRITICUM-AESTIVUM; METABOLISM; EXPOSURE; PLANTS; LEAVES; PHOTOSYNTHESIS; EFFICIENCY; OXIDES;
Keywords:
GLUTAMATE DEHYDROGENASE; GLUTAMINE SYNTHETASE; NITRATE REDUCTASE; NITRITE REDUCTASE; NITROGEN 15; OZONE; STABLE ISOTOPES; TRITICUM AESTIVUM; ZEA MAYS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
D. Mocker et al., "THE IMPACT OF OZONE ON THE N-15 INCORPORATION AND NITROGEN ASSIMILATION OF WHEAT AND MAIZE", Isotopes in environmental and health studies, 32(2-3), 1996, pp. 181-190

Abstract

Young wheat (C3) and maize (C4) plants were exposed to near-ambient concentrations of ozone in open-top chambers in order to investigate the possible effects of ozone on nitrogen metabolism. Nitrogen was supplied to the plants by adding N-15-labelled tracer substances via the soil substrate. Enzyme activities (NADH nitrate reductase, nitrite reductase, glutamine synthetase and NADH glutamate dehydrogenase) and the incorporation of N-15 were determined. The findings show that nitrogen metabolism was affected by O-3, however, there were distinct differences between the two species. In plants treated with O-3, NADH nitrate reductase activity in maize leaves was reduced, while NR activity in wheat leaves only slightly declined. Only minor changes were observed with respect to the activities of nitrite reductase, glutamine synthetase and NADH glutamate dehydrogenase. Feeding experiments using (NO3-)-N-15 showed that the incorporation of nitrate nitrogen in wheat plants exposed to ozone remains virtually unchanged, whereas in maize plants reduced incorporation rates were observed for nitrate nitrogen. The incorporation of ammonium nitrogen was distinctly increased in wheat andmaize by the impact of ozone. When investigating pigment contents, reduced levels of chlorophyll a and b and carotenoids were observed, whereas the pigment content of wheat leaves remained unchanged. These results indicate that young maize plants are more susceptible than wheat plants to short-term ozone exposure.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/09/20 alle ore 09:45:00