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Registro Completo |
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Biblioteca(s): |
Embrapa Mandioca e Fruticultura. |
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Data corrente: |
03/01/1994 |
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Data da última atualização: |
03/01/1994 |
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Autoria: |
SINCLAIR, T. R.; ALLEN JUNIOR, L. H. |
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Afiliação: |
ARS-USDA, Agronomy Physiology Laboratory, Bulding 164, University of Florida, Gainesville, Florida 32611, U.S.A. |
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Título: |
Carbon dioxide ant water vapour exchange of leaves on field-grown citrus trees. |
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Ano de publicação: |
0 |
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Fonte/Imprenta: |
Journal of experimental botany, v.33, n. 137, p.1166-1175 l982. |
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Idioma: |
Inglês |
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Conteúdo: |
Carbon dioxide and water vapour exchange rates were measured on attached leaves of field-grown citrus trees. The exchange rates were measured continuously during several weeks in the spring of two suddessive years. These data confimed the reather low of maximum CO2 excange (6-ll umol m-2s-1) by citrus leaves. However, the maximum rate was maintained through the midday period on only about half the days.On the other days, characterized by high temperatures and high atmospheric water vapour pressure deficits, pronounced midday depressions in CO2 exchange rates were observed. Since midday transpiration remained stable at a constant rate even with increasing vapour pressure deficit, these results indicate that stomatal closure was occurring. In fact, the data suggest that specific, maximum transpiration rates were asscociated with differing rootstocks. Thus, the rate of water supply to the leaves may be an important factor in determining the maximum transpiration rate, and thereby mediating control os stomatal conductance and the resultant midday depression in CO2 exchange rates. |
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Palavras-Chave: |
DPV; Transpiracao. |
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Thesagro: |
Fotossíntese; Poncirus Trifoliata. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 01608naa a2200181 a 4500
001 1646389
005 1994-01-03
008 bl --- 0-- u #d
100 1 $aSINCLAIR, T. R.
245 $aCarbon dioxide ant water vapour exchange of leaves on field-grown citrus trees.
260 $c0
520 $aCarbon dioxide and water vapour exchange rates were measured on attached leaves of field-grown citrus trees. The exchange rates were measured continuously during several weeks in the spring of two suddessive years. These data confimed the reather low of maximum CO2 excange (6-ll umol m-2s-1) by citrus leaves. However, the maximum rate was maintained through the midday period on only about half the days.On the other days, characterized by high temperatures and high atmospheric water vapour pressure deficits, pronounced midday depressions in CO2 exchange rates were observed. Since midday transpiration remained stable at a constant rate even with increasing vapour pressure deficit, these results indicate that stomatal closure was occurring. In fact, the data suggest that specific, maximum transpiration rates were asscociated with differing rootstocks. Thus, the rate of water supply to the leaves may be an important factor in determining the maximum transpiration rate, and thereby mediating control os stomatal conductance and the resultant midday depression in CO2 exchange rates.
650 $aFotossíntese
650 $aPoncirus Trifoliata
653 $aDPV
653 $aTranspiracao
700 1 $aALLEN JUNIOR, L. H.
773 $tJournal of experimental botany$gv.33, n. 137, p.1166-1175 l982.
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Registro original: |
Embrapa Mandioca e Fruticultura (CNPMF) |
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| 1. |  | OLIVEIRA, J. M.; BOTOSSO, P. C.; GALVÃO, F.; ESEMANN-QUADROS, K.; OLMEDO, G. M.; ALBIERO JUNIOR, A.; ADENESKI FILHO, E.; OLIVEIRA, J. R. The Araucaria dendrochronological network: growth patterns and climatic signals of paraná-pine on the Southern Brazilian plateau. In: AMERICAN DENDROCHRONOLOGY CONFERENCE, 3., 2016, Mendoza. Meeting program and abstracts. [Mendoza]: IANIGLA; [S.l.]: Tree-Ring Society, 2016. p. 40. Ameridendro.| Tipo: Resumo em Anais de Congresso |
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