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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
02/03/1999 |
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Data da última atualização: |
02/03/1999 |
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Autoria: |
SCHJORRING, J. K.; JENSEN, P. |
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Título: |
Phosphorus nutrition of barley, buckwheat and rape seedlings. I. Influence of seed-borne P and external P levels on growth, P content and 32P/31P-fractionation in shoots and roots. |
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Ano de publicação: |
1984 |
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Fonte/Imprenta: |
Physiologia Plantarum, v.61, p.577-583, 1984. |
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Idioma: |
Inglês |
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Conteúdo: |
Seedlings of barley (Hordeum vulgare L. cvs Salka and Zita), buckwheat (Fagopyrum esculentum Moench) and rape (Brassica napus L. spp. napus cv. Line) were grown at 8 or 10 different external P levels in the range 0-200 uM. Apart from P, the nutrient solutions were complete. In some experiments with barley and rape, 32P-labelled phosphate was used. Root fresh weights of buckwheat and rape decreased when the external P supply exceeded the level required for maximal root development. In all three species, the roots constituted a decreasing proportion of the total plant fresh weight as the external P level increased. The shoot/root fresh weight ratio increased linearly with the P concentration of the roots. The ratio between the P cocentration in shoots and roots increased with the P status of the seedlings grown at low to intermediate external P levels, but decreased at higher P levels. The proportion of total seedling-P held in roots consequently reached a minimum value and thereafter increased as the P status of the seedlings increased. This indicates that some control mechanism counteracted the accumulation of harmful P levels in the shoots. 32P- Phosphate uptake by seedlings of barley and rape grown in solutions with mM P overestimated the actual net phosphorus uptake by a factor of 6 to 7, indicating a marked fractionation of 32P and 31P. For seedlings grown in solutions with 25 uM P (barley) or 50 uM (rape) no fractionation occurred. The relative excess of 32P in high P seedlings accumulated in the roots. It is suggested that the fracionation was caused by efflux of low specific activity phosphorus and by diffusion of free phosphate ions across the plasmalemma of the root cells in response to a differente in the concentration gradient between the two P isotopes. MenosSeedlings of barley (Hordeum vulgare L. cvs Salka and Zita), buckwheat (Fagopyrum esculentum Moench) and rape (Brassica napus L. spp. napus cv. Line) were grown at 8 or 10 different external P levels in the range 0-200 uM. Apart from P, the nutrient solutions were complete. In some experiments with barley and rape, 32P-labelled phosphate was used. Root fresh weights of buckwheat and rape decreased when the external P supply exceeded the level required for maximal root development. In all three species, the roots constituted a decreasing proportion of the total plant fresh weight as the external P level increased. The shoot/root fresh weight ratio increased linearly with the P concentration of the roots. The ratio between the P cocentration in shoots and roots increased with the P status of the seedlings grown at low to intermediate external P levels, but decreased at higher P levels. The proportion of total seedling-P held in roots consequently reached a minimum value and thereafter increased as the P status of the seedlings increased. This indicates that some control mechanism counteracted the accumulation of harmful P levels in the shoots. 32P- Phosphate uptake by seedlings of barley and rape grown in solutions with mM P overestimated the actual net phosphorus uptake by a factor of 6 to 7, indicating a marked fractionation of 32P and 31P. For seedlings grown in solutions with 25 uM P (barley) or 50 uM (rape) no fractionation occurred. The relative excess of 32P in high P s... Mostrar Tudo |
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Palavras-Chave: |
Barley cultivar; Plant; Shoot/root frsh weight ratio. |
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Thesagro: |
Brassica Napus; Cevada; Fagopyrum Esculentum; Fósforo; Hordeum Vulgare; Nutrição; Planta. |
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Thesaurus Nal: |
nutrition; phosphorus. |
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Categoria do assunto: |
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Marc: |
LEADER 02625naa a2200277 a 4500
001 1793846
005 1999-03-02
008 1984 bl --- 0-- u #d
100 1 $aSCHJORRING, J. K.
245 $aPhosphorus nutrition of barley, buckwheat and rape seedlings. I. Influence of seed-borne P and external P levels on growth, P content and 32P/31P-fractionation in shoots and roots.
260 $c1984
520 $aSeedlings of barley (Hordeum vulgare L. cvs Salka and Zita), buckwheat (Fagopyrum esculentum Moench) and rape (Brassica napus L. spp. napus cv. Line) were grown at 8 or 10 different external P levels in the range 0-200 uM. Apart from P, the nutrient solutions were complete. In some experiments with barley and rape, 32P-labelled phosphate was used. Root fresh weights of buckwheat and rape decreased when the external P supply exceeded the level required for maximal root development. In all three species, the roots constituted a decreasing proportion of the total plant fresh weight as the external P level increased. The shoot/root fresh weight ratio increased linearly with the P concentration of the roots. The ratio between the P cocentration in shoots and roots increased with the P status of the seedlings grown at low to intermediate external P levels, but decreased at higher P levels. The proportion of total seedling-P held in roots consequently reached a minimum value and thereafter increased as the P status of the seedlings increased. This indicates that some control mechanism counteracted the accumulation of harmful P levels in the shoots. 32P- Phosphate uptake by seedlings of barley and rape grown in solutions with mM P overestimated the actual net phosphorus uptake by a factor of 6 to 7, indicating a marked fractionation of 32P and 31P. For seedlings grown in solutions with 25 uM P (barley) or 50 uM (rape) no fractionation occurred. The relative excess of 32P in high P seedlings accumulated in the roots. It is suggested that the fracionation was caused by efflux of low specific activity phosphorus and by diffusion of free phosphate ions across the plasmalemma of the root cells in response to a differente in the concentration gradient between the two P isotopes.
650 $anutrition
650 $aphosphorus
650 $aBrassica Napus
650 $aCevada
650 $aFagopyrum Esculentum
650 $aFósforo
650 $aHordeum Vulgare
650 $aNutrição
650 $aPlanta
653 $aBarley cultivar
653 $aPlant
653 $aShoot/root frsh weight ratio
700 1 $aJENSEN, P.
773 $tPhysiologia Plantarum$gv.61, p.577-583, 1984.
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Embrapa Pantanal (CPAP) |
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| 2. |  | PÉRTILLE, F.; IBELLI, A. M. G.; SHARIF, M. E.; POLETI, M. D.; FRÖHLICH, A. S.; REZAEI, S.; LEDUR, M. C.; JENSEN, P.; GUERRERO-BOSAGNA, C.; COUTINHO. L. L. Putative epigenetic biomarkers of stress in red blood cells of chickens reared across different biomes. Frontiers in Genetics, 20 Nov 2020.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Suínos e Aves. |
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| 3. | | PÉRTILLE, F.; BOSAGNA, C. G.; SILVA, V. H. da; BOSCHIERO, C.; NUNES, J. de R. da S.; LEDUR, M. C.; JENSEN, P.; COUTINHO, L. L. High-throughput and cost-effective chicken genotyping using next-generation sequencing. Scientific Reports, v. 6, n. 26929, 2016.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
| Biblioteca(s): Embrapa Suínos e Aves. |
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| Registros recuperados : 3 | |
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