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dc.contributor.authorSANTOS, P. M.pt_BR
dc.contributor.authorTHORTON, B.pt_BR
dc.contributor.authorCORSI, M.pt_BR
dc.date.accessioned2011-04-09T21:34:25Z-
dc.date.available2011-04-09T21:34:25Z-
dc.date.created2002-12-04pt_BR
dc.date.issued2002pt_BR
dc.identifier.citationJournal of Experimental Botany, v.53, n.378, p.2167-2176, nov. 2002.pt_BR
dc.identifier.urihttp://www.alice.cnptia.embrapa.br/alice/handle/doc/41868pt_BR
dc.descriptionThe C 3 grass Poa trivialis and the C 4 grass Panicum maximum were grown in sand culture and received a complete nutrient solution with nitrogen supplied as 1.5 mol m -3 NH 4NO 3. 15 N tracer techniques were used to quantify the relative use of root uptake and mobilization in supplying nitrogen to growing leaves in intact plants which either continued to receive nitrogen or which received the complete nutrient solution without nitrogen. The allocation of both 15 N-labelled nitrogen uptake and unlabelled mobilized nitrogen indicated that, under their conditions of growth, the sink strength of growing leaves was relatively greater in P. maximum than P. trivialis. The supply of nitrogen by mobilization to side tillers of P. trivialis was completely stopped as the external nitrogen supply was reduced, whilst in P. maximum some allocation of mobilized nitrogen to side tillers, roots and growing leaves was maintained. In both plant species receiving an uninterrupted supply of nitrogen the allocation pattern of mobilized nitrogen differed from that of nitrogen derived from root uptake. Differences exist in the degree to which P. trivialis and P. maximum utilized uptake and mobilization to supply nitrogen to the growing leaves. In P. trivialis roots were always a net sink of mobilized nitrogen, irrespective of the external nitrogen supply. In P. maximum, roots were a net sink of mobilized nitrogen when external nitrogen was withdrawn, but exhibited both source and sink behaviour when nitrogen supply was continued.eng
dc.language.isoengpt_BR
dc.rightsopenAccesspt_BR
dc.subjectLeaf growthpt_BR
dc.subjectN mobilizationpt_BR
dc.subjectN uptakept_BR
dc.subjectC4eng
dc.subjectC3eng
dc.titleNitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.pt_BR
dc.typeArtigo de periódicopt_BR
dc.date.updated2011-04-10T11:11:11Zpt_BR
dc.subject.thesagroPanicum Maximumpt_BR
dc.subject.nalthesaurusPoa trivialispt_BR
riaa.ainfo.id41868pt_BR
riaa.ainfo.lastupdate2007-03-29pt_BR
dc.identifier.doi10.1093/jxb/erf066eng
dc.contributor.institutionPATRICIA MENEZES SANTOS, CPPSEeng
dc.contributor.institutionBARRY THORNTON, The Macaulay Institute, Craigiebucklereng
dc.contributor.institutionMOACYR CORSI, USP-ESALQ.eng
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