Registro Completo
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
04/12/2002 |
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Data da última atualização: |
20/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
SANTOS, P. M.; THORTON, B.; CORSI, M. |
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Afiliação: |
PATRICIA MENEZES SANTOS, CPPSE; BARRY THORNTON, The Macaulay Institute, Craigiebuckler; MOACYR CORSI, USP-ESALQ. |
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Título: |
Nitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Journal of Experimental Botany, v.53, n.378, p.2167-2176, nov. 2002. |
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DOI: |
10.1093/jxb/erf066 |
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Idioma: |
Inglês |
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Conteúdo: |
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. MenosThe 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 whe... Mostrar Tudo |
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Palavras-Chave: |
C3; C4; Leaf growth; N mobilization; N uptake. |
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Thesagro: |
Panicum Maximum. |
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Thesaurus NAL: |
Poa trivialis. |
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Categoria do assunto: |
F Plantas e Produtos de Origem Vegetal |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/41868/1/PROCIPMS2002.00088.PDF
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Marc: |
LEADER 02242naa a2200241 a 4500
001 1041868
005 2022-06-20
008 2002 bl uuuu u00u1 u #d
024 7 $a10.1093/jxb/erf066$2DOI
100 1 $aSANTOS, P. M.
245 $aNitrogen dynamics in the intact grasses Poa trivialis and Panicum maximum receiving contrastaing supplies of nitrogen.$h[electronic resource]
260 $c2002
520 $aThe 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.
650 $aPoa trivialis
650 $aPanicum Maximum
653 $aC3
653 $aC4
653 $aLeaf growth
653 $aN mobilization
653 $aN uptake
700 1 $aTHORTON, B.
700 1 $aCORSI, M.
773 $tJournal of Experimental Botany$gv.53, n.378, p.2167-2176, nov. 2002.
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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