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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 Amapá; Embrapa Amazônia Oriental. |
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Data corrente: |
04/01/1996 |
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Data da última atualização: |
03/07/2024 |
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Autoria: |
DIAS-FILHO, M. B.; DAWSON, T. E. |
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Afiliação: |
EMBRAPA-CPATU. CAIXA POSTAL, 48 66.017.970 BELÉM-PARÁ-BRASIL. |
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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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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 03397naa a2200289 a 4500
001 1344012
005 2024-07-03
008 1995 bl uuuu u00u1 u #d
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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Embrapa Amapá (CPAF-AP) |
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| Registros recuperados : 30 | |
| 5. |  | FELICIO, J. C.; CAMARGO, C. E. de O.; GALLO, P. B.; CAMARGO, M. B. P. de. Avaliação de genótipos de triticale em solos de várzea no Estado de São Paulo. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 30, n. 7, p. 939-946, jul. 1995. Título em inglês: Evaluation of triticale genotypes under low land conditions in the State of São Paulo, Brazil.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 6. | | CAMARGO, C. E. de O.; FERREIRA FILHO, A. W. P.; FELICIO, J. C. Estimativas de herdabilidade e correlações quanto a produção de grãos e outras características agronômicas em populações de trigo. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 35, n. 2, p. 369-379, fev. 2000 Título em inglês: Variance, heritability and correlations in wheat hybrid populations for grain yield and other agronomic characteristics.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 9. | | FELICIO, J. C.; CAMARGO, C. E. O.; GERMANI, R.; FREITAS, J. G. Efeito do atraso da colheita no rendimento e no progresso germinativo do grao na espiga, em genotipos de trigo plantados no Estado de Sao Paulo. In: REUNIAO NACIONAL DE PESQUISA DE TRIGO, 18., 1999, Passo Fundo, RS. Anais... Passo Fundo, 1999. v.1, p.284-291.| Biblioteca(s): Embrapa Agroindústria de Alimentos. |
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| 10. | | FELICIO, J. C.; CAMARGO, C. E. O.; CASTRO, J. L. de; CAMARGO, M. B. P. de. Épocas de semeadura de Triticale em Capão Bonito, SP. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 34, n. 12, p. 2192-2202, nov. 1999 Título em inglês: Seeding times of triticale in Capão Bonito, SP.| Biblioteca(s): Embrapa Unidades Centrais. |
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| 13. | | FELÍCIO, J. C.; CAMARGO, C. E. de O.; CHAVES, M. S.; FERREIRA FILHO, A. W. P. Potencial produtivo, resistência à ferrugem da folha e qualidade industrial da farinha em genótipos de trigo. Bragantia, Campinas, v. 69, n. 4, p. 787-796, 2010.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: B - 1 |
| Biblioteca(s): Embrapa Trigo. |
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| 16. | | FELICIO, J. C.; CAMARGO, C. E. de O.; PIZZINATTO, A.; CASTRO, J. L. de; GALLO, P. B. Comportamento Agronômico e Avaliação Tecnológica de Genótipos de Triticale no Estado de São Paulo em 1988 a 1989. Pesquisa Agropecuaria Brasileira, Brasilia, v.28, n.3, p.281-294,mar.1993| Biblioteca(s): Embrapa Unidades Centrais. |
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| 17. | | COSTAMILAN, L. M.; FELÍCIO, J. C.; DALLA NORA, T.; SCHEEREN, P. L.; FEKSA, H. R.; MACIEL, J. L. N. Efetividade de genes Pm de trigo a oídio, em 2006. Fitopatologia Brasileira, Brasília, DF, v. 32, p. S145, ago. 2007. Suplemento, ref. 0179. Edição dos Resumos do XL Congresso Brasileiro de Fitopatologia, Maringá, ago. 2007.| Tipo: Resumo em Anais de Congresso | Circulação/Nível: -- - -- |
| Biblioteca(s): Embrapa Trigo. |
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| 18. | | COSTAMILAN, L. M.; SCHEEREN, P. L.; FELÍCIO, J. C.; MELO, M. S. de; CAMPOS, L. A. C.; DALLA NORA, T. Efetividade de genes Pm de trigo a oídio (Blumeria graminis f. sp. tritici), em 2007. Tropical Plant Pathology, Brasília, DF, v. 33, p. S201, ago. 2008. Suplemento, ref MEL-009. Edição dos Resumos do XLI Congresso Brasileiro de Fitopatologia, Belo Horizonte, ago. 2008.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Trigo. |
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| Registros recuperados : 30 | |
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