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Registro Completo |
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Biblioteca(s): |
Embrapa Pantanal. |
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Data corrente: |
30/05/1996 |
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Data da última atualização: |
30/05/1996 |
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Autoria: |
FORD, C. W.; WILSON, J. R. |
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Título: |
Changes in levels of solutes during osmotic adjustment to water stress in leaves of four tropical pasture species. |
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Ano de publicação: |
1981 |
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Fonte/Imprenta: |
Australian Journal of Plant Physiology, v.8, n.1, p.77-91, 1981. |
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Idioma: |
Inglês |
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Conteúdo: |
Three tropical grasses, green panic (Panicum maximum var. trichoglume), buffel grass (Cenchrus ciliaris), and spear grass (Heteropogon contortus), and a tropical legume, siratro (Macroptilium atropurpureum), were field-grown in a semi-arid environment. One set of plants was well, watered, while another set was subject to a continuous 35-day drying cycle. Samples of specific of specific leaves were taken at the beginning, middle and end of the drying cycle, and 1, 5 and 14 days after rewatering. The major low-molecular-weight solutes accumulated in the grasses during water stres were the inorganic ions sodium (green panic), potassium (buffel and spear grass) and chloride (all grasses). Accumulation of these ions largely accounted for the osmotic adjustment determined from a previous study of water relations of the leaves. Concentrations of the minor constituents glucose and fructose increased only slightly in the stressed grasses, whereas levels of sucrose, the major carbohydrate component, increased substantialy, particularly in spear grass. Inositol accumulated to a small extent in spear grass. Differences between the grasses were evident in the organic acid spectrum and also in changes in concentration of organic acids due to water stress. In water-stressed tisue, malate levels increased in green panic and spear grass but were resonably constant in buffel grass. Aconitate concentrations (not detected in buffel grass) decreased green panic, but increased in spear grass. Oxalate (only trace quantities in spear grass) was a major component in green panic and buffel grass, but did not appear to vary with increase in water stress. Succinate accumulated only in stressed spear grass. The contribution of carbohydrates and organic to the osmotic adjustment was relatively small. Proline accumulated to varying degress in all stressed grasses. Betaine occurred only in trace amounts in spear grass, but accumulated substantially in green panic and buffel grass. Water-stressed leaves of siratro did not accumulate inorganic ions, sugars, organic acids, proline or betaine, but pinitol levels increased. Implications of the results relating osmotic adjustment to changes in chemical composition are discussed. MenosThree tropical grasses, green panic (Panicum maximum var. trichoglume), buffel grass (Cenchrus ciliaris), and spear grass (Heteropogon contortus), and a tropical legume, siratro (Macroptilium atropurpureum), were field-grown in a semi-arid environment. One set of plants was well, watered, while another set was subject to a continuous 35-day drying cycle. Samples of specific of specific leaves were taken at the beginning, middle and end of the drying cycle, and 1, 5 and 14 days after rewatering. The major low-molecular-weight solutes accumulated in the grasses during water stres were the inorganic ions sodium (green panic), potassium (buffel and spear grass) and chloride (all grasses). Accumulation of these ions largely accounted for the osmotic adjustment determined from a previous study of water relations of the leaves. Concentrations of the minor constituents glucose and fructose increased only slightly in the stressed grasses, whereas levels of sucrose, the major carbohydrate component, increased substantialy, particularly in spear grass. Inositol accumulated to a small extent in spear grass. Differences between the grasses were evident in the organic acid spectrum and also in changes in concentration of organic acids due to water stress. In water-stressed tisue, malate levels increased in green panic and spear grass but were resonably constant in buffel grass. Aconitate concentrations (not detected in buffel grass) decreased green panic, but increased in spear grass. Oxa... Mostrar Tudo |
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Palavras-Chave: |
Buffel grass; Green panic; Panico verde; Pastagem tropical; Spear grass; Tropical pasture. |
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Thesagro: |
Capim Buffel; Cenchrus ciliaris; Legume; Leguminosa; Macroptilium Atropurpureum; Panicum Maximum; Siratro. |
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Thesaurus Nal: |
Heteropogon contortus. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03091naa a2200301 a 4500
001 1788870
005 1996-05-30
008 1981 bl --- 0-- u #d
100 1 $aFORD, C. W.
245 $aChanges in levels of solutes during osmotic adjustment to water stress in leaves of four tropical pasture species.
260 $c1981
520 $aThree tropical grasses, green panic (Panicum maximum var. trichoglume), buffel grass (Cenchrus ciliaris), and spear grass (Heteropogon contortus), and a tropical legume, siratro (Macroptilium atropurpureum), were field-grown in a semi-arid environment. One set of plants was well, watered, while another set was subject to a continuous 35-day drying cycle. Samples of specific of specific leaves were taken at the beginning, middle and end of the drying cycle, and 1, 5 and 14 days after rewatering. The major low-molecular-weight solutes accumulated in the grasses during water stres were the inorganic ions sodium (green panic), potassium (buffel and spear grass) and chloride (all grasses). Accumulation of these ions largely accounted for the osmotic adjustment determined from a previous study of water relations of the leaves. Concentrations of the minor constituents glucose and fructose increased only slightly in the stressed grasses, whereas levels of sucrose, the major carbohydrate component, increased substantialy, particularly in spear grass. Inositol accumulated to a small extent in spear grass. Differences between the grasses were evident in the organic acid spectrum and also in changes in concentration of organic acids due to water stress. In water-stressed tisue, malate levels increased in green panic and spear grass but were resonably constant in buffel grass. Aconitate concentrations (not detected in buffel grass) decreased green panic, but increased in spear grass. Oxalate (only trace quantities in spear grass) was a major component in green panic and buffel grass, but did not appear to vary with increase in water stress. Succinate accumulated only in stressed spear grass. The contribution of carbohydrates and organic to the osmotic adjustment was relatively small. Proline accumulated to varying degress in all stressed grasses. Betaine occurred only in trace amounts in spear grass, but accumulated substantially in green panic and buffel grass. Water-stressed leaves of siratro did not accumulate inorganic ions, sugars, organic acids, proline or betaine, but pinitol levels increased. Implications of the results relating osmotic adjustment to changes in chemical composition are discussed.
650 $aHeteropogon contortus
650 $aCapim Buffel
650 $aCenchrus ciliaris
650 $aLegume
650 $aLeguminosa
650 $aMacroptilium Atropurpureum
650 $aPanicum Maximum
650 $aSiratro
653 $aBuffel grass
653 $aGreen panic
653 $aPanico verde
653 $aPastagem tropical
653 $aSpear grass
653 $aTropical pasture
700 1 $aWILSON, J. R.
773 $tAustralian Journal of Plant Physiology$gv.8, n.1, p.77-91, 1981.
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Registro original: |
Embrapa Pantanal (CPAP) |
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Registro Completo
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
27/11/1993 |
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Data da última atualização: |
14/11/2023 |
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Autoria: |
SOUZA, H. B. de; GUIMARÃES, M. C. de F.; GUIMARÃES, G. de A.; MELO, C. F. M. de. |
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Afiliação: |
HILKIAS BERNARDO DE SOUZA, FCAP; MÁRIO CARDOSO DE F. GUIMARÃES, UFPA; GERALDO DE ASSIS GUIMARÃES, UFPA; CELIO FRANCISCO MARQUES DE MELO, CPATU / FCAP. |
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Título: |
Argilas do município de Irituia (Pará). |
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Ano de publicação: |
1974 |
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Fonte/Imprenta: |
Boletim Técnico. IPEAN, n. 61, p. 25-45, nov. 1974. |
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Idioma: |
Português |
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Palavras-Chave: |
Brasil; Irituia; Pará; Physical analysis. |
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Thesagro: |
Análise Física; Análise Química; Argila. |
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Thesaurus NAL: |
Amazonia; chemical analysis; clay. |
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Categoria do assunto: |
P Recursos Naturais, Ciências Ambientais e da Terra |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/doc/376074/1/Argilas-do-municipio-de-Irituia.pdf
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Marc: |
LEADER 00686naa a2200265 a 4500
001 1376074
005 2023-11-14
008 1974 bl uuuu u00u1 u #d
100 1 $aSOUZA, H. B. de
245 $aArgilas do município de Irituia (Pará).
260 $c1974
650 $aAmazonia
650 $achemical analysis
650 $aclay
650 $aAnálise Física
650 $aAnálise Química
650 $aArgila
653 $aBrasil
653 $aIrituia
653 $aPará
653 $aPhysical analysis
700 1 $aGUIMARÃES, M. C. de F.
700 1 $aGUIMARÃES, G. de A.
700 1 $aMELO, C. F. M. de
773 $tBoletim Técnico. IPEAN$gn. 61, p. 25-45, nov. 1974.
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