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Registro Completo |
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Biblioteca(s): |
Embrapa Soja. |
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Data corrente: |
18/11/1992 |
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Data da última atualização: |
26/10/2004 |
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Autoria: |
BUNCE, J. A. |
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Título: |
Water stress as an almost everyday phenomenon. |
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Ano de publicação: |
1989 |
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Fonte/Imprenta: |
In: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989 Buenos Aires. Actas... Buenos Aires: AASOJA, 1989. |
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Volume: |
t.1 |
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Páginas: |
p.232-237. |
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Idioma: |
Inglês |
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Conteúdo: |
This review discusses some recent evidence that even withouth drought soybeans experience water stress nearly every day which is sufficient to decrease leaf area growth and carbon dioxide uptake. The role of turgor pressure in leaf area expansion, and difficulties of measuring it because of stress relaxation are discussed. Midday carbon dioxide uptake rates are often reduced by high leaf to air water vapor pressure differences and probably also by leaf water deficits. While abscisic acid is often implicated in water stress-induced stomatal closure and consequent reduction in photosynthetic rate, more direct roles of water deficit or abscisic acid in inhibition of photosynthesis need reexamination, as we have fallen victim to an inapropriate gas exchange model. Extrapolating from the responses of leaf gas exchange to water stress to the responses of crop water use efficiency will require more quantification of the micrometeorological feedbacks. It is concluded that selection aimed at increasing water uptake or tolerance of dehydration may be useful even for mesic environments. |
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Palavras-Chave: |
Estress hidrico; EUA; Soybean; USA. |
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Thesagro: |
Fotossíntese; Soja. |
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Thesaurus Nal: |
photosynthesis; water stress. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01728naa a2200241 a 4500
001 1451736
005 2004-10-26
008 1989 bl uuuu u00u1 u #d
100 1 $aBUNCE, J. A.
245 $aWater stress as an almost everyday phenomenon.
260 $c1989
300 $ap.232-237. t.1
490 $vt.1
520 $aThis review discusses some recent evidence that even withouth drought soybeans experience water stress nearly every day which is sufficient to decrease leaf area growth and carbon dioxide uptake. The role of turgor pressure in leaf area expansion, and difficulties of measuring it because of stress relaxation are discussed. Midday carbon dioxide uptake rates are often reduced by high leaf to air water vapor pressure differences and probably also by leaf water deficits. While abscisic acid is often implicated in water stress-induced stomatal closure and consequent reduction in photosynthetic rate, more direct roles of water deficit or abscisic acid in inhibition of photosynthesis need reexamination, as we have fallen victim to an inapropriate gas exchange model. Extrapolating from the responses of leaf gas exchange to water stress to the responses of crop water use efficiency will require more quantification of the micrometeorological feedbacks. It is concluded that selection aimed at increasing water uptake or tolerance of dehydration may be useful even for mesic environments.
650 $aphotosynthesis
650 $awater stress
650 $aFotossíntese
650 $aSoja
653 $aEstress hidrico
653 $aEUA
653 $aSoybean
653 $aUSA
773 $tIn: CONFERENCIA MUNDIAL DE INVESTIGACION EN SOJA, 4., 1989 Buenos Aires. Actas... Buenos Aires: AASOJA, 1989.
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| 14534. |  | SALTON, J. C.; MIELNICZUK, J.; BAYER, C.; FABRÍCIO, A. C.; MACEDO, M. C. M.; BROCH, D. L.; BOENI, M. CONCEIÇÃO, P. C. Matéria orgânica do solo na integração lavoura-pecuária em Mato Grosso do Sul. Dourados: Embrapa Agropecuária Oeste, 2005. 58 p. (Embrapa Agropecuária Oeste. Boletim de pesquisa e desenvolvimento, 29).| Tipo: Boletim de Pesquisa e Desenvolvimento |
| Biblioteca(s): Embrapa Agropecuária Oeste; Embrapa Gado de Corte. |
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