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Registro Completo |
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Biblioteca(s): |
Embrapa Meio-Norte. |
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Data corrente: |
21/09/1998 |
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Data da última atualização: |
21/09/1998 |
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Autoria: |
VU, J. C. V.; YELENOSKY, G. |
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Título: |
Water deficit and associated changes in some photosynthetic parameters in leaves of 'Valencia' orange (Citrus sinensis [L.] Osbeck). |
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Ano de publicação: |
1988 |
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Fonte/Imprenta: |
Plant Physiology, v.88, p.375-378, 1988. |
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Idioma: |
Inglês |
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Conteúdo: |
Photosynthetic CO2 assimilation, transpiration, ribulose-1,5-bisphosphate carboxylase (RuBPCase), and soluble protein were reduced in leaves of water-deficit (stress) 'Valencia' orange (Citrus sinensis [L.] Osbeck). Maximum photosynthetic CO2 assimilation and transpiration, which occurred before midday for both control and stressed plants, was 58 and 40%, respectively, for the stress (-2.0 megapascals leaf water potential) as compared to the control (-0.6 megapascals leaf water potential). As water deficit became more severe in the afternoon, with water potential of -3.1 megapascals for the stressed leaves vs. -1.1 megapascals for control leaves, stressed-leaf transpiration declined and photosynthetic CO2 assimilation rapidly dropped to zero. Water deficit decreased both activation and total activity of RuBPCase. Activation of the enzyme was about 62% (of fully activated enzyme in vitro) for the stress, compared to 80% for the control. Water deficit reduced RuBPCase initial activity by 40% and HCO3-/Mg24-saturated activity by 22%. However, RuBPCase for both stressed and control leaves were similar in Kcat (25 moles CO2 per mole enzyme per second) and Km for CO2 (18.9 micromolar). Concentrations of RuBPCase and soluble protein of stressed leaves averaged 80 and 85%, respectively, of control leaves. Thus, reductions in activation and concentration of RuBPCase in Valencia orange leaves contributed to reductions in enzyme activities during water-deficit periods. Declines in leaf photosynthesis, soluble protein, and RuBPCase activation and concentration due to water deficit were, however, recoverable at 5 days after rewatering. MenosPhotosynthetic CO2 assimilation, transpiration, ribulose-1,5-bisphosphate carboxylase (RuBPCase), and soluble protein were reduced in leaves of water-deficit (stress) 'Valencia' orange (Citrus sinensis [L.] Osbeck). Maximum photosynthetic CO2 assimilation and transpiration, which occurred before midday for both control and stressed plants, was 58 and 40%, respectively, for the stress (-2.0 megapascals leaf water potential) as compared to the control (-0.6 megapascals leaf water potential). As water deficit became more severe in the afternoon, with water potential of -3.1 megapascals for the stressed leaves vs. -1.1 megapascals for control leaves, stressed-leaf transpiration declined and photosynthetic CO2 assimilation rapidly dropped to zero. Water deficit decreased both activation and total activity of RuBPCase. Activation of the enzyme was about 62% (of fully activated enzyme in vitro) for the stress, compared to 80% for the control. Water deficit reduced RuBPCase initial activity by 40% and HCO3-/Mg24-saturated activity by 22%. However, RuBPCase for both stressed and control leaves were similar in Kcat (25 moles CO2 per mole enzyme per second) and Km for CO2 (18.9 micromolar). Concentrations of RuBPCase and soluble protein of stressed leaves averaged 80 and 85%, respectively, of control leaves. Thus, reductions in activation and concentration of RuBPCase in Valencia orange leaves contributed to reductions in enzyme activities during water-deficit periods. Declines in leaf... Mostrar Tudo |
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Palavras-Chave: |
Citros; Deficit hidrico; Orange; Photosynthetic. |
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Thesagro: |
Citrus Sinensis; Fotossíntese; Laranja. |
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Categoria do assunto: |
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Marc: |
LEADER 02270naa a2200217 a 4500
001 1054792
005 1998-09-21
008 1988 bl --- 0-- u #d
100 1 $aVU, J. C. V.
245 $aWater deficit and associated changes in some photosynthetic parameters in leaves of 'Valencia' orange (Citrus sinensis [L.] Osbeck).
260 $c1988
520 $aPhotosynthetic CO2 assimilation, transpiration, ribulose-1,5-bisphosphate carboxylase (RuBPCase), and soluble protein were reduced in leaves of water-deficit (stress) 'Valencia' orange (Citrus sinensis [L.] Osbeck). Maximum photosynthetic CO2 assimilation and transpiration, which occurred before midday for both control and stressed plants, was 58 and 40%, respectively, for the stress (-2.0 megapascals leaf water potential) as compared to the control (-0.6 megapascals leaf water potential). As water deficit became more severe in the afternoon, with water potential of -3.1 megapascals for the stressed leaves vs. -1.1 megapascals for control leaves, stressed-leaf transpiration declined and photosynthetic CO2 assimilation rapidly dropped to zero. Water deficit decreased both activation and total activity of RuBPCase. Activation of the enzyme was about 62% (of fully activated enzyme in vitro) for the stress, compared to 80% for the control. Water deficit reduced RuBPCase initial activity by 40% and HCO3-/Mg24-saturated activity by 22%. However, RuBPCase for both stressed and control leaves were similar in Kcat (25 moles CO2 per mole enzyme per second) and Km for CO2 (18.9 micromolar). Concentrations of RuBPCase and soluble protein of stressed leaves averaged 80 and 85%, respectively, of control leaves. Thus, reductions in activation and concentration of RuBPCase in Valencia orange leaves contributed to reductions in enzyme activities during water-deficit periods. Declines in leaf photosynthesis, soluble protein, and RuBPCase activation and concentration due to water deficit were, however, recoverable at 5 days after rewatering.
650 $aCitrus Sinensis
650 $aFotossíntese
650 $aLaranja
653 $aCitros
653 $aDeficit hidrico
653 $aOrange
653 $aPhotosynthetic
700 1 $aYELENOSKY, G.
773 $tPlant Physiology$gv.88, p.375-378, 1988.
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Registro original: |
Embrapa Meio-Norte (CPAMN) |
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