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EFFECTS OF INORGANIC FERTILIZERS AND RHIZOBIAL INOCULATION ON GROWTH, NODULATION AND TANNIN CONTENT OF ACACIELLA ANGUSTISSIMA (MILL.) BRITTON & ROSE Gayana Botánica
Ruiz-Valdiviezo,Víctor M; Ayora-Talavera,Teresa R; Gutiérrez-Miceli,Federico A; Dendooven,Luc; Rincón-Rosales,Reiner.
The effects of different inorganic fertilizers and rhizobial inoculation on shoot height, total shoot and root dry weight, nodule number, total shoot nitrogen, nitrogenase activity and tannic acid content of Acaciella angustissima (Mill.) Britton & Rose were investigated in the laboratory. Seedlings were grown in a climate chamber in glass tubes containing sterilized mixture of vermiculite and peat moss, and treated with combinations of nitrogen (N) at 45 mg plant¹, phosphorus (P) at 30 mg plant¹, potassium (K) at 20 mg plant¹ and inoculated with the bacterium Sinorhizobium mexicanum. The combined applications of N, P or K to uninoculated plants increased shoot height and dry weight as compared to the unamended plantlets. The tannin content in...
Tipo: Journal article Palavras-chave: Acetylene reduction; Growth chamber; N P K fertilizer; Sinorhizobium mexicanum.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432009000200007
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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
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