Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.

Detalhes bibliográficos
Autor(a) principal: SANTOS, P. M.
Data de Publicação: 2002
Outros Autores: THORTON, B., CORSI, M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
Texto Completo: http://www.alice.cnptia.embrapa.br/alice/handle/doc/41868
Resumo: The 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 In P. maximum, roots were a net sink of mobilized nitrogen when external nitrogen was withdrawn, but exhibited both source and sink behaviour when nitrogen supply was continued.
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spelling Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.Leaf growthN mobilizationN uptakeC4C3Panicum MaximumPoa trivialisThe 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.PATRICIA MENEZES SANTOS, CPPSEBARRY THORNTON, The Macaulay Institute, CraigiebucklerMOACYR CORSI, USP-ESALQ.SANTOS, P. M.THORTON, B.CORSI, M.2011-04-09T21:34:25Z2011-04-09T21:34:25Z2002-12-0420022011-04-10T11:11:11Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleJournal of Experimental Botany, v.53, n.378, p.2167-2176, nov. 2002.http://www.alice.cnptia.embrapa.br/alice/handle/doc/4186810.1093/jxb/erf066enginfo:eu-repo/semantics/openAccessreponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPA2017-08-15T21:52:17Zoai:www.alice.cnptia.embrapa.br:doc/41868Repositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestopendoar:21542017-08-15T21:52:17falseRepositório InstitucionalPUBhttps://www.alice.cnptia.embrapa.br/oai/requestcg-riaa@embrapa.bropendoar:21542017-08-15T21:52:17Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false
dc.title.none.fl_str_mv Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
title Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
spellingShingle Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
SANTOS, P. M.
Leaf growth
N mobilization
N uptake
C4
C3
Panicum Maximum
Poa trivialis
title_short Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
title_full Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
title_fullStr Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
title_full_unstemmed Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
title_sort Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.
author SANTOS, P. M.
author_facet SANTOS, P. M.
THORTON, B.
CORSI, M.
author_role author
author2 THORTON, B.
CORSI, M.
author2_role author
author
dc.contributor.none.fl_str_mv PATRICIA MENEZES SANTOS, CPPSE
BARRY THORNTON, The Macaulay Institute, Craigiebuckler
MOACYR CORSI, USP-ESALQ.
dc.contributor.author.fl_str_mv SANTOS, P. M.
THORTON, B.
CORSI, M.
dc.subject.por.fl_str_mv Leaf growth
N mobilization
N uptake
C4
C3
Panicum Maximum
Poa trivialis
topic Leaf growth
N mobilization
N uptake
C4
C3
Panicum Maximum
Poa trivialis
description The 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.
publishDate 2002
dc.date.none.fl_str_mv 2002-12-04
2002
2011-04-09T21:34:25Z
2011-04-09T21:34:25Z
2011-04-10T11:11:11Z
dc.type.driver.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv Journal of Experimental Botany, v.53, n.378, p.2167-2176, nov. 2002.
http://www.alice.cnptia.embrapa.br/alice/handle/doc/41868
10.1093/jxb/erf066
identifier_str_mv Journal of Experimental Botany, v.53, n.378, p.2167-2176, nov. 2002.
10.1093/jxb/erf066
url http://www.alice.cnptia.embrapa.br/alice/handle/doc/41868
dc.language.iso.fl_str_mv eng
language eng
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv reponame:Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
instname_str Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron_str EMBRAPA
institution EMBRAPA
reponame_str Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
collection Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice)
repository.name.fl_str_mv Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA - Alice) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
repository.mail.fl_str_mv cg-riaa@embrapa.br
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