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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Soja. |
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Data corrente: |
22/09/1992 |
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Data da última atualização: |
22/09/1992 |
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Autoria: |
LYNCH, J.; WHITE, J. W. |
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Afiliação: |
Dep. of Horticulture, The Pennsylvania State Univ., University Park, PA, 16802. |
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Título: |
Shoot nitrogen dynamics in tropical common bean. |
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Ano de publicação: |
1992 |
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Fonte/Imprenta: |
Crop Science, v.32, p.392-397, 1992. |
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Idioma: |
Inglês
Português |
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Conteúdo: |
The common bean (Phaseolus vulgaris L.) is an important food crop in the tropics, where its productivity is often limited by low soil N availability. An ideotype for efficient N-use in bean would distribute N in time and space so that leaf N (and therefore leaf photosynthetic capacity) is optimized with respect to reproductive N sinks. To define parameters and estimate genetic variability for N use, we examined shoot N dynamics in three tropical bean genotypes of similar phenology believed to differ in N acquisition and allocation. Seeds were sown in a high-N soil in two plantings separated by 20 d. Shoots of BAT 477 acquired considerably more N than porrillo sintetico, but both genotypes yielded well. G 5059 acquired an intermediate amount of N, partitioned more N to leaves, and matured slightly later, but had a lower final N harvest index (NHI) than the other two genotypes. Time of planting had a substantial effect on shoot N uptake and partitioning. After flowering, N was lost from leaves and stems, rose and fell in young pods and pod walls, and accumulated in seeds. Harvest index (HI) and NHI increased almost linearly from flowering to physiological maturity at the same rate in all three genotypes. Seed N duration dominated post-flowering shoot N during. Leaf N duration represented 25% of post-flowering shoot N during on average. Leaf CO2 exchange rate (CER) was highly correlated with leaf N content, and both declined during mid and late pod filling. Instantaneous leaf photosynthetic N-use efficienty (CER per u MenosThe common bean (Phaseolus vulgaris L.) is an important food crop in the tropics, where its productivity is often limited by low soil N availability. An ideotype for efficient N-use in bean would distribute N in time and space so that leaf N (and therefore leaf photosynthetic capacity) is optimized with respect to reproductive N sinks. To define parameters and estimate genetic variability for N use, we examined shoot N dynamics in three tropical bean genotypes of similar phenology believed to differ in N acquisition and allocation. Seeds were sown in a high-N soil in two plantings separated by 20 d. Shoots of BAT 477 acquired considerably more N than porrillo sintetico, but both genotypes yielded well. G 5059 acquired an intermediate amount of N, partitioned more N to leaves, and matured slightly later, but had a lower final N harvest index (NHI) than the other two genotypes. Time of planting had a substantial effect on shoot N uptake and partitioning. After flowering, N was lost from leaves and stems, rose and fell in young pods and pod walls, and accumulated in seeds. Harvest index (HI) and NHI increased almost linearly from flowering to physiological maturity at the same rate in all three genotypes. Seed N duration dominated post-flowering shoot N during. Leaf N duration represented 25% of post-flowering shoot N during on average. Leaf CO2 exchange rate (CER) was highly correlated with leaf N content, and both declined during mid and late pod filling. Instantaneous leaf p... Mostrar Tudo |
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Palavras-Chave: |
CO2; Common bean; Exchange; Indice; Rati; Troca. |
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Thesagro: |
Colheita; Feijão; Fotossíntese; Nitrogênio; Phaseolus Vulgaris; Taxa. |
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Thesaurus Nal: |
harvest index; nitrogen; photosynthesis. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02261naa a2200313 a 4500
001 1457905
005 1992-09-22
008 1992 bl --- 0-- u #d
100 1 $aLYNCH, J.
245 $aShoot nitrogen dynamics in tropical common bean.
260 $c1992
520 $aThe common bean (Phaseolus vulgaris L.) is an important food crop in the tropics, where its productivity is often limited by low soil N availability. An ideotype for efficient N-use in bean would distribute N in time and space so that leaf N (and therefore leaf photosynthetic capacity) is optimized with respect to reproductive N sinks. To define parameters and estimate genetic variability for N use, we examined shoot N dynamics in three tropical bean genotypes of similar phenology believed to differ in N acquisition and allocation. Seeds were sown in a high-N soil in two plantings separated by 20 d. Shoots of BAT 477 acquired considerably more N than porrillo sintetico, but both genotypes yielded well. G 5059 acquired an intermediate amount of N, partitioned more N to leaves, and matured slightly later, but had a lower final N harvest index (NHI) than the other two genotypes. Time of planting had a substantial effect on shoot N uptake and partitioning. After flowering, N was lost from leaves and stems, rose and fell in young pods and pod walls, and accumulated in seeds. Harvest index (HI) and NHI increased almost linearly from flowering to physiological maturity at the same rate in all three genotypes. Seed N duration dominated post-flowering shoot N during. Leaf N duration represented 25% of post-flowering shoot N during on average. Leaf CO2 exchange rate (CER) was highly correlated with leaf N content, and both declined during mid and late pod filling. Instantaneous leaf photosynthetic N-use efficienty (CER per u
650 $aharvest index
650 $anitrogen
650 $aphotosynthesis
650 $aColheita
650 $aFeijão
650 $aFotossíntese
650 $aNitrogênio
650 $aPhaseolus Vulgaris
650 $aTaxa
653 $aCO2
653 $aCommon bean
653 $aExchange
653 $aIndice
653 $aRati
653 $aTroca
700 1 $aWHITE, J. W.
773 $tCrop Science$gv.32, p.392-397, 1992.
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Registro original: |
Embrapa Soja (CNPSO) |
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| 2. |  | RAMIREZ-VILLEGAS, J.; MOLERO MILAN, A.; ALEXANDROV, N.; ASSENG, S.; CHALLINOR, A. J.; CROSSA, J.; VAN EEUWIJK, F.; GHANEM, M. E.; GRENIER, C.; HEINEMANN, A. B.; WANG, J.; JULIANA, P.; KEHEL, Z.; KHOLOVA, J; KOO, J.; PEQUENO, D.; QUIROZ, R.; REBOLLEDO, M. C.; SUKUMARAN, S.; VADEZ, V.; WHITE, J. W.; REYNOLDS, M. CGIAR modeling approaches for resource-constrained scenarios: I. Accelerating crop breeding for a changing climate. Crop Science, 2020. Online Version of Record before inclusion in an issue.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Arroz e Feijão. |
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| Registros recuperados : 2 | |
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