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	Provedor de dados ArchiMer (1) Braz. J. Plant Physiol. (1) Rev. Bras. Ciênc. Solo (1) Autor Auby, Isabelle (1) Bourgues, S (1) Chang,Andrew C (1) Dewit, R (1) Guilherme,Luiz Roberto Guimarães (1) Jorge,Renato A. (1) Keltjens,Willem G. (1) Marchi,Giuliano (1) Mariano,Eduardo D. (1) Menossi,Marcelo (1) Welsh, Dt (1) Mais... Palavra-chave Root exudates (3) Rhizosphere (2) Acetylene reduction (1) Al resistance (1) Al toxicity (1) Ammonium (1) Anion channels (1) Carbon sources (1) Heavy metals (1) Nitrogen fixation (1) Organic acids (1) Plant photosynthesis (1) Soil extractant (1) Transgenic plants (1) Zostera noltii (1) Mais... Tipo do documento Info:eu-repo/semantics/article (2) Text (1) Ano 2011 (1) 2005 (1) 1997 (1) País Brazil (2) France (1) Idioma Inglês (3)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 3 Primeira ... 1 ... Última Effect of plant photosynthesis, carbon sources and ammonium availability on nitrogen fixation rates in the rhizosphere of Zostera noltii ArchiMer Welsh, Dt; Bourgues, S; Dewit, R; Auby, Isabelle. Rates of nitrogen fixation (measured as acetylene reduction) in the rhizosphere of the seagrass Zostera noltii were highly dependent upon plant photosynthetic activity being significantly stimulated at elevated CO2 concentrations and by light, both in the short-term and over diurnal cycles. Stimulation by light became insignificant when 5 mM sucrose was added to the sediment porewater, indicating that in the absence of added carbon sources, light stimulation was due to direct inputs of plant photosynthate to the rhizosphere. Addition of a range of carbon sources to the rhizosphere sediment stimulated rates of acetylene reduction, with this stimulation being significant for sucrose and lactate. Surprisingly, whilst low additions of ammonium to the sediment... Tipo: Text Palavras-chave: Acetylene reduction; Nitrogen fixation; Rhizosphere; Zostera noltii; Plant photosynthesis; Root exudates; Carbon sources; Ammonium. Ano: 1997 URL: http://archimer.ifremer.fr/doc/00151/26266/24350.pdf Plant availability of trace elements in sewage sludge-treated soils: methodology¹ Rev. Bras. Ciênc. Solo Marchi,Giuliano; Guilherme,Luiz Roberto Guimarães; Chang,Andrew C. Synthetic root exudates were formulated based on the organic acid composition of root exudates derived from the rhizosphere of aseptically grown corn plants, pH of the rhizosphere, and the background chemical matrices of the soil solutions. The synthetic root exudates, which mimic the chemical conditions of the rhizosphere environment where soil-borne metals are dissolved and absorbed by plants, were used to extract metals from sewage-sludge treated soils 16 successive times. The concentrations of Zn, Cd, Ni, Cr, and Cu of the sludge-treated soil were 71.74, 0.21, 15.90, 58.12, and 37.44 mg kg-1, respectively. The composition of synthetic root exudates consisted of acetic, butyric, glutaric, lactic, maleic, propionic, pyruvic, succinic, tartaric, and... Tipo: Info:eu-repo/semantics/article Palavras-chave: Heavy metals; Soil extractant; Organic acids; Rhizosphere; Root exudates. Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832011000400039 Metabolism and root exudation of organic acid anions under aluminium stress Braz. J. Plant Physiol. Mariano,Eduardo D.; Jorge,Renato A.; Keltjens,Willem G.; Menossi,Marcelo. Numerous plant species can release organic acid anions (OA) from their roots in response to toxic aluminium (Al) ions present in the rooting medium. Hypothetically OA complex Al in the root apoplast and/or rhizosphere and thus avoid its interaction with root cellular components and its entry in the root symplast. Two temporal patterns of root OA exudation are observed. In pattern I, OA release is rapidly activated after the contact of the root with Al ions while in pattern II there is a lag phase between the addition of Al and the beginning of OA release. Compounds other than OA have been detected in root exudates and are also correlated with Al resistance in plants. Plant species like buckwheat and tea show mechanisms of Al tolerance, which confer them... Tipo: Info:eu-repo/semantics/article Palavras-chave: Al resistance; Al toxicity; Anion channels; Root exudates; Transgenic plants. Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202005000100013 Registros recuperados: 3 Primeira ... 1 ... Última

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