Data/hora: 24/06/2024 00:46:18

Biblioteca(s): 	Embrapa Soja.	
Data corrente: 	27/11/1992	
Data da última atualização: 	26/10/2004	
Autoria: 	GRAY, V. M.; DRESSLER, G. B.	
Afiliação: 	CSIR/WITS Photosynthetic Nitrogen Metabolism Research Unit, Department of Botany, University of the Witwatersrand, 1 Jan Smuts Ave., Johannesburg, R.S.A.	
Título: 	Gaseous nitrogen oxide (NOx) evolution from soybean leaves: A chemical or enzymatic reaction?	
Ano de publicação: 	1989	
Fonte/Imprenta: 	In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989, Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.	
Volume: 	t.1.	
Páginas: 	p.326-331.	
Idioma: 	Inglês	
Conteúdo: 	Studies were conducted to identify and quantify the species of gaseous nitrogen oxides (NOx) produced by leaves of Glycine max production of gaseous nitrogen oxides was found to be dependent on pH and nitrite concentration. Furthermore, it was found that nitrogen dioxide evolved quite readily from nitrite containing solutions. This observation led to the finding that some in the NOx produced by soybean leaves under the conditions of the in vivo assay was nitrogen dioxide, which was, in turn derived from the nitrite produced following the enzymatic reduction of nitrate by nitrate reductase. The conversion of nitrite to nigrogen dioxide occurred independently of any enzyme. It has been proposed that an NADPH specific constitutive nitrate reductase was  responsi-ble for the production of nitric oxide. In vivo studies with intact leaves showed that a small portion of the gaseous nitrogen oxides produced was nitrite derived nitrogen dioxide with nitric oxide accounting for a major fraction of the total. Nitrate/nitrite accumulation stoichiometric studies with partially pure enzymes do not conclusively support the hypothesis that the NADPH constitutive nitrate reductase reduces nitrate to nitric oxide.  	
Palavras-Chave: 	Soybean; Tissue.	
Thesagro: 	Fisiologia; Glycine Max; Metabolismo; Nitrogênio; Soja; Tecido.	
Thesaurus Nal: 	metabolism; nitrogen; physiology; South Africa.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Soja (CNPSO)