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Registro Completo |
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Biblioteca(s): |
Embrapa Trigo. |
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Data corrente: |
10/01/2010 |
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Data da última atualização: |
17/10/2011 |
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Autoria: |
CHAPIN, F. S.; BIELESKI, R. L. |
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Título: |
Mild phosphorus stress in barley and a related low-phosphorus-adapted barleygrass: phosphorus fractions and phosphate absorption in relation to growth. |
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Ano de publicação: |
1982 |
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Fonte/Imprenta: |
Physiologia Plantarum, Copenhagen, v. 54, n. 3, p. 309-317, 1982. |
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Idioma: |
Inglês |
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Conteúdo: |
Barleygrass (Hordeum leporinum) from Australian low-P (phosphorus) soils and commercial barley (H. vulgare) with high fertilizer requirements were grown in solution culture at 3 levels of P supply. The high-P-adapted barley produced more biomass at all levels of P supply and was more responsive to added P in terms of rate of tillering, rate of leaf production, final leaf size, and therefore total shoot weight compared to barleygrass. In both species root: shoot ratio decreased in response to improved tissue P status, even at P levels where total biomass did not respond to P supply. Removal of endosperm reserves of barley reduced total biomass to a greater extent than it altered phosphate absorption rate, thus increasing tissue P status and making plants less responsive to added P. Similarly, barleygrass had a slower growth rate but a comparable P absorption rate to that of barley. Thus barleygrass also accumulated tissue P and was unresponsive to added P. All phosphorus chemical fractions increased in response to improved tissue P status, but to differing extents (inorganic-P > nucleic acid-P > lipid-P > ester-P), suggesting that all P fractions (particularly inorganic P) serve, in part, a storage function. Both barleygrass and barley without endosperm had higher concentrations of all P fractions (particularly inorganic P) than did unaltered barley, but this was due entirely to their higher P status (due to slow growth) rather than to any major difference in P metabolism between species. We conclude that slow growth is more important than interspecific differences in P metabolism, P absorption, or efficiency of P utilization in explaining the success of barleygrass and other low-P-adapted species on infertile soils. MenosBarleygrass (Hordeum leporinum) from Australian low-P (phosphorus) soils and commercial barley (H. vulgare) with high fertilizer requirements were grown in solution culture at 3 levels of P supply. The high-P-adapted barley produced more biomass at all levels of P supply and was more responsive to added P in terms of rate of tillering, rate of leaf production, final leaf size, and therefore total shoot weight compared to barleygrass. In both species root: shoot ratio decreased in response to improved tissue P status, even at P levels where total biomass did not respond to P supply. Removal of endosperm reserves of barley reduced total biomass to a greater extent than it altered phosphate absorption rate, thus increasing tissue P status and making plants less responsive to added P. Similarly, barleygrass had a slower growth rate but a comparable P absorption rate to that of barley. Thus barleygrass also accumulated tissue P and was unresponsive to added P. All phosphorus chemical fractions increased in response to improved tissue P status, but to differing extents (inorganic-P > nucleic acid-P > lipid-P > ester-P), suggesting that all P fractions (particularly inorganic P) serve, in part, a storage function. Both barleygrass and barley without endosperm had higher concentrations of all P fractions (particularly inorganic P) than did unaltered barley, but this was due entirely to their higher P status (due to slow growth) rather than to any major difference in P metabolism bet... Mostrar Tudo |
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Palavras-Chave: |
Hordeum leporinum; Nutrient adaptation; Phosphorus chemistry. |
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Thesagro: |
Cevada; Fósforo; Hordeum Vulgare. |
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Categoria do assunto: |
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Marc: |
LEADER 02410naa a2200205 a 4500
001 1838464
005 2011-10-17
008 1982 bl --- 0-- u #d
100 1 $aCHAPIN, F. S.
245 $aMild phosphorus stress in barley and a related low-phosphorus-adapted barleygrass$bphosphorus fractions and phosphate absorption in relation to growth.
260 $c1982
520 $aBarleygrass (Hordeum leporinum) from Australian low-P (phosphorus) soils and commercial barley (H. vulgare) with high fertilizer requirements were grown in solution culture at 3 levels of P supply. The high-P-adapted barley produced more biomass at all levels of P supply and was more responsive to added P in terms of rate of tillering, rate of leaf production, final leaf size, and therefore total shoot weight compared to barleygrass. In both species root: shoot ratio decreased in response to improved tissue P status, even at P levels where total biomass did not respond to P supply. Removal of endosperm reserves of barley reduced total biomass to a greater extent than it altered phosphate absorption rate, thus increasing tissue P status and making plants less responsive to added P. Similarly, barleygrass had a slower growth rate but a comparable P absorption rate to that of barley. Thus barleygrass also accumulated tissue P and was unresponsive to added P. All phosphorus chemical fractions increased in response to improved tissue P status, but to differing extents (inorganic-P > nucleic acid-P > lipid-P > ester-P), suggesting that all P fractions (particularly inorganic P) serve, in part, a storage function. Both barleygrass and barley without endosperm had higher concentrations of all P fractions (particularly inorganic P) than did unaltered barley, but this was due entirely to their higher P status (due to slow growth) rather than to any major difference in P metabolism between species. We conclude that slow growth is more important than interspecific differences in P metabolism, P absorption, or efficiency of P utilization in explaining the success of barleygrass and other low-P-adapted species on infertile soils.
650 $aCevada
650 $aFósforo
650 $aHordeum Vulgare
653 $aHordeum leporinum
653 $aNutrient adaptation
653 $aPhosphorus chemistry
700 1 $aBIELESKI, R. L.
773 $tPhysiologia Plantarum, Copenhagen$gv. 54, n. 3, p. 309-317, 1982.
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Registro original: |
Embrapa Trigo (CNPT) |
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Biblioteca(s): |
Embrapa Clima Temperado. |
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Data corrente: |
04/02/2013 |
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Data da última atualização: |
04/02/2013 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
RAMM, A.; FAGUNDES, P. R. R.; SEVERO, A. C. M.; STRECK, E. A.; LOPES, J. L.; OLIVEIRA, F. A.; MAGALHAES JUNIOR, A. M. de. |
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Afiliação: |
Aline Ramm, UFPel – FAEM; PAULO RICARDO REIS FAGUNDES, CPACT; ALCIDES CRISTIANO MORAIS SEVERO, CPACT; Eduardo A. Streck, UFPel – FAEM; Jennifer L. Lopes, UFPel – FAEM; Filipe A. Oliveira, UFPel – FAEM; ARIANO MARTINS DE MAGALHAES JUNIOR, CPACT. |
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Título: |
Ensaio de valor cultivo e uso de linhagens de arroz irrigado para o sistema clearfield no RS - safra 2011/12. |
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Ano de publicação: |
2012 |
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Fonte/Imprenta: |
In: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DA EMBRAPA CLIMA TEMPERADO, 4., 2012, Pelotas. Ciência e inovação para 2050: qual o futuro que queremos? Resumos e palestras... Pelotas: Embrapa Clima Temperado, 2012. 1 CD-ROM. |
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Idioma: |
Português |
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Thesagro: |
Arroz Irrigado. |
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Categoria do assunto: |
X Pesquisa, Tecnologia e Engenharia |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/75957/1/89.pdf
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Marc: |
LEADER 00791nam a2200181 a 4500
001 1948233
005 2013-02-04
008 2012 bl uuuu u00u1 u #d
100 1 $aRAMM, A.
245 $aEnsaio de valor cultivo e uso de linhagens de arroz irrigado para o sistema clearfield no RS - safra 2011/12.$h[electronic resource]
260 $aIn: ENCONTRO DE INICIAÇÃO CIENTÍFICA E PÓS-GRADUAÇÃO DA EMBRAPA CLIMA TEMPERADO, 4., 2012, Pelotas. Ciência e inovação para 2050: qual o futuro que queremos? Resumos e palestras... Pelotas: Embrapa Clima Temperado, 2012. 1 CD-ROM.$c2012
650 $aArroz Irrigado
700 1 $aFAGUNDES, P. R. R.
700 1 $aSEVERO, A. C. M.
700 1 $aSTRECK, E. A.
700 1 $aLOPES, J. L.
700 1 $aOLIVEIRA, F. A.
700 1 $aMAGALHAES JUNIOR, A. M. de
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