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 | Acesso ao texto completo restrito à biblioteca da Embrapa Amazônia Oriental. Para informações adicionais entre em contato com cpatu.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Amazônia Oriental. |
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Data corrente: |
04/01/1996 |
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Data da última atualização: |
22/11/2022 |
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Autoria: |
DIAS-FILHO, M. B.; DAWSON, T. E. |
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Afiliação: |
MOACYR BERNARDINO DIAS FILHO, CPATU; Cornell University. |
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Título: |
Physiological responses to soil moisture stress in two Amazonian gap-invader species. |
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Ano de publicação: |
1995 |
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Fonte/Imprenta: |
Functional Ecology, v. 9, p. 213-221, 1995. |
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DOI: |
10.2307/2390567 |
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Idioma: |
Inglês |
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Conteúdo: |
1. Disturbed habitats in Amazonia, like active pastures and abandoned agricultural areas, are characterized by significant diurnal and seasonal drought stress that may restrict successful colonization by many plant taxa. Some species, however, show a remarkable capacity to withstand these water-limited conditions. We investigated, under controlled conditions, the bulk tissue-water relations and the gas-exchange characteristics in response to soil moisture stress of Solanum crinitum Lam. and Vismia guianensis (Aubl.) Choisy, two co-occurring gap-invading small trees known to dominate, disturbed, drought-prone habitats in the eastern Brazilian Amazon region. 2. Bulk tissue-water relations of these two species were very different. Vismia guianensis had significantly higher bulk tissue elastic modulus (more rigid tissues) and lower bulk tissue osmotic potential at full hydration and at turgor loss than S. crinitum. 3. The elastic and osmotic properties could either enhance turgor maintenance or increase the ability of a plant to extract soil water. In turn, this may help explain their ability to succeed in drought-prone habitats. With more elastic tissue properties, S. crinitum is able to maintain turgor and thus leaf gas exchange over greater changes in tissue water content, whereas having relatively more rigid tissues would aid V. guianensis in developing water potential gradients from the leaves to the soil with little tissue water loss, thus enhancing water uptake from drier soils. 4. Photosynthetic capacity in S. crinitum was less affected by soil moisture stress than V. guianensis. Furthermore, because S. crinitum maintained stomatal conductance (g), but photosynthesis (A) declined under moisture stress, intrinsic water-use efficiency (A/g) actually dropped when water was limiting for this species. In contrast, V. guianensis maintained high A/g under both watering regimes and was always more water-use efficient than S. crinitum. Moreover, S. crinitum had two- to fourfold higher dark respiration than V. guianensis. We believe that it is this combination of traits that leads to lower growth in S. crinitum when compared to V. guianensis in the field. 5. We suggest that the different gas-exchange responses and tissue water relations properties represent two different strategies for dealing with water deficits. Solanum crinitum, appears to be more able to cope with short-term water stress and is regarded to be a successful stress tolerator. In contrast, V. guianesis, appears to be able to cope better with chronic, long-term water stress, what we call a successful stress-avoider. Menos1. Disturbed habitats in Amazonia, like active pastures and abandoned agricultural areas, are characterized by significant diurnal and seasonal drought stress that may restrict successful colonization by many plant taxa. Some species, however, show a remarkable capacity to withstand these water-limited conditions. We investigated, under controlled conditions, the bulk tissue-water relations and the gas-exchange characteristics in response to soil moisture stress of Solanum crinitum Lam. and Vismia guianensis (Aubl.) Choisy, two co-occurring gap-invading small trees known to dominate, disturbed, drought-prone habitats in the eastern Brazilian Amazon region. 2. Bulk tissue-water relations of these two species were very different. Vismia guianensis had significantly higher bulk tissue elastic modulus (more rigid tissues) and lower bulk tissue osmotic potential at full hydration and at turgor loss than S. crinitum. 3. The elastic and osmotic properties could either enhance turgor maintenance or increase the ability of a plant to extract soil water. In turn, this may help explain their ability to succeed in drought-prone habitats. With more elastic tissue properties, S. crinitum is able to maintain turgor and thus leaf gas exchange over greater changes in tissue water content, whereas having relatively more rigid tissues would aid V. guianensis in developing water potential gradients from the leaves to the soil with little tissue water loss, thus enhancing water uptake from drier... Mostrar Tudo |
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Palavras-Chave: |
Brasil; Estresse Hidrico; Osmotic potential; Osmotico; Plant; Potencial; Relação com água; Water relation. |
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Thesagro: |
Fisiologia; Fotossíntese; Planta. |
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Thesaurus Nal: |
Amazonia; photosynthesis. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 03434naa a2200301 a 4500
001 1397068
005 2022-11-22
008 1995 bl uuuu u00u1 u #d
024 7 $a10.2307/2390567$2DOI
100 1 $aDIAS-FILHO, M. B.
245 $aPhysiological responses to soil moisture stress in two Amazonian gap-invader species.$h[electronic resource]
260 $c1995
520 $a1. Disturbed habitats in Amazonia, like active pastures and abandoned agricultural areas, are characterized by significant diurnal and seasonal drought stress that may restrict successful colonization by many plant taxa. Some species, however, show a remarkable capacity to withstand these water-limited conditions. We investigated, under controlled conditions, the bulk tissue-water relations and the gas-exchange characteristics in response to soil moisture stress of Solanum crinitum Lam. and Vismia guianensis (Aubl.) Choisy, two co-occurring gap-invading small trees known to dominate, disturbed, drought-prone habitats in the eastern Brazilian Amazon region. 2. Bulk tissue-water relations of these two species were very different. Vismia guianensis had significantly higher bulk tissue elastic modulus (more rigid tissues) and lower bulk tissue osmotic potential at full hydration and at turgor loss than S. crinitum. 3. The elastic and osmotic properties could either enhance turgor maintenance or increase the ability of a plant to extract soil water. In turn, this may help explain their ability to succeed in drought-prone habitats. With more elastic tissue properties, S. crinitum is able to maintain turgor and thus leaf gas exchange over greater changes in tissue water content, whereas having relatively more rigid tissues would aid V. guianensis in developing water potential gradients from the leaves to the soil with little tissue water loss, thus enhancing water uptake from drier soils. 4. Photosynthetic capacity in S. crinitum was less affected by soil moisture stress than V. guianensis. Furthermore, because S. crinitum maintained stomatal conductance (g), but photosynthesis (A) declined under moisture stress, intrinsic water-use efficiency (A/g) actually dropped when water was limiting for this species. In contrast, V. guianensis maintained high A/g under both watering regimes and was always more water-use efficient than S. crinitum. Moreover, S. crinitum had two- to fourfold higher dark respiration than V. guianensis. We believe that it is this combination of traits that leads to lower growth in S. crinitum when compared to V. guianensis in the field. 5. We suggest that the different gas-exchange responses and tissue water relations properties represent two different strategies for dealing with water deficits. Solanum crinitum, appears to be more able to cope with short-term water stress and is regarded to be a successful stress tolerator. In contrast, V. guianesis, appears to be able to cope better with chronic, long-term water stress, what we call a successful stress-avoider.
650 $aAmazonia
650 $aphotosynthesis
650 $aFisiologia
650 $aFotossíntese
650 $aPlanta
653 $aBrasil
653 $aEstresse Hidrico
653 $aOsmotic potential
653 $aOsmotico
653 $aPlant
653 $aPotencial
653 $aRelação com água
653 $aWater relation
700 1 $aDAWSON, T. E.
773 $tFunctional Ecology$gv. 9, p. 213-221, 1995.
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Registro original: |
Embrapa Amazônia Oriental (CPATU) |
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Registro Completo
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Biblioteca(s): |
Embrapa Suínos e Aves. |
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Data corrente: |
22/10/2008 |
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Data da última atualização: |
22/10/2008 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
GIRON, J.; ANGONEZE, D. L.; ANGNES, G.; MIRANDA, C. R. de. |
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Afiliação: |
Janiel Giron, Universidade do Contestado - Concórdia; Deise L. Angoneze, Bolsista do Projeto TSGA - Embrapa Suínos e Aves; Graciele Angnes, Bolsista do Projeto TSGA - Embrapa Suínos e Aves; Claudio Rocha de Miranda, Embrapa Suínos e Aves. |
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Título: |
Gestão da água na escola: estudo quantitativo e qualitativo da água consumida nas escolas do município de Concórdia-SC. |
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Ano de publicação: |
2008 |
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Fonte/Imprenta: |
In: SEMANA ALTO URUGUAI DO MEIO AMBIENTE, 17.; ENCONTRO DO COLETIVO EDUCADOR DO ALTO URUGUAI GAÚCHO, 5.; ENCONTRO DA REGIÃO MUSEOLÓGICA DO RIO GRANDE DO SUL, 3., 2008, Erechim. Anais. Erechim: EdiFapes, 2008. |
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Idioma: |
Português |
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Notas: |
Projeto/Plano de Ação: 04.06.31.800-05. SEMANA ALTO URUGUAI DO MEIO AMBIENTE - SAUMA. |
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Thesagro: |
Escola; Gestão; Qualidade da Água. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 00817naa a2200193 a 4500
001 1444098
005 2008-10-22
008 2008 bl --- 0-- u #d
100 1 $aGIRON, J.
245 $aGestão da água na escola$bestudo quantitativo e qualitativo da água consumida nas escolas do município de Concórdia-SC.
260 $c2008
500 $aProjeto/Plano de Ação: 04.06.31.800-05. SEMANA ALTO URUGUAI DO MEIO AMBIENTE - SAUMA.
650 $aEscola
650 $aGestão
650 $aQualidade da Água
700 1 $aANGONEZE, D. L.
700 1 $aANGNES, G.
700 1 $aMIRANDA, C. R. de
773 $tIn: SEMANA ALTO URUGUAI DO MEIO AMBIENTE, 17.; ENCONTRO DO COLETIVO EDUCADOR DO ALTO URUGUAI GAÚCHO, 5.; ENCONTRO DA REGIÃO MUSEOLÓGICA DO RIO GRANDE DO SUL, 3., 2008, Erechim. Anais. Erechim: EdiFapes, 2008.
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