Photosynthetic characteristics in leaves of ‘Valencia’ orange ( Citrus sinensis (L.) Osbeck) grown under high and low temperature regimes
Identifieur interne : 004139 ( Main/Exploration ); précédent : 004138; suivant : 004140Photosynthetic characteristics in leaves of ‘Valencia’ orange ( Citrus sinensis (L.) Osbeck) grown under high and low temperature regimes
Auteurs : J. C. V. Vu [États-Unis] ; G. Yelenosky [États-Unis]Source :
- Environmental and Experimental Botany [ 0098-8472 ] ; 1987.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Enzyme.
English descriptors
- KwdEn :
Abstract
The photosynthetic activities of leaves of 1-year-old ‘Valencia’ orange (Citrus sinensis (L.) Osbeck) were determined after trees were maintained for 30 consecutive days in controlled growth chambers under high temperature (HT, 32.2°C day/21.1°C night) and low temperature (LT, 15.6°C day/4.4°C night). Leaf CO2 exchange rates (CER), stomatal conductance (Cs), transpiration (E), chlorophyll (Chl), soluble protein, and proline of the LT treatment were 48, 55, 26, 78, 113 and 265%, respectively, of the HT treatment. The water potentials (ψ) of leaves from HT treatment were about 0.5 MPa more negative than those from LT leaves. Activities of ribulose-1,5-bisphosphate carboxylase (RuBPCase) and phosphoenolpyruvate carboxylase (PEPCase) of the HT treatment, expressed on a leaf fresh weight basis, were 91 and 49%, respectively, of the LT treatment. PEPCase of both temperature treatments, however, showed no differences in affinities for HCO3− and PEP, having a Km (HCO3−) of 0.61 mM and a Km (PEP) of 0.15 mM. The ratio of RuBPCase/PEPCase was 6.6 for the HT treatment, compared to 3.5 for the LT treatment. When the 30-day HT-treated trees were transferred to the LT chamber, CER, Cs and ψ, determined 24 hr after transfer, were comparable to values of 30-day LT-treated trees; the RuBPCase activity decreased about 18% and PEPCase activity increased about 31% after 96 hr in the LT chamber. These relative changes decreased the RuBPCase/PEPCase ratio from 6.6 to 3.7. Switching trees from the 30-day LT treatment to the HT chamber resulted in increases in CER, Cs and E and decreases in ψ; the RuBPCase activity decreased about 10%, but PEPCase activity was relatively unaffected after 96 hr following the transfer to the HT chamber. The LT-induced changes in the ratio of carboxylase activities would indicate that some alteration in the photosynthetic carbon metabolism might occur in ‘Valencia’ orange leaf tissues subjected to cold acclimation conditions.
Url:
DOI: 10.1016/0098-8472(87)90037-2
Affiliations:
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Le document en format XML
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<term>Phosphoenolpyruvate carboxylase</term>
<term>Photosynthesis</term>
<term>Procollagen-proline,2-oxoglutarate 4-dioxygenase</term>
<term>Proteins</term>
<term>Ribulosebisphosphate carboxylase</term>
<term>Stomatal conductance</term>
<term>Temperature effect</term>
<term>Transpiration</term>
<term>Water potential</term>
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<term>Echange gazeux</term>
<term>Enzyme</term>
<term>Facteur thermique</term>
<term>Phosphoenolpyruvate carboxylase</term>
<term>Photosynthèse</term>
<term>Plante fruitière</term>
<term>Potentiel hydrique</term>
<term>Procollagen-proline,2-oxoglutarate 4-dioxygenase</term>
<term>Protéine</term>
<term>Ribulosebisphosphate carboxylase</term>
<term>Transpiration</term>
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<front><div type="abstract" xml:lang="en">The photosynthetic activities of leaves of 1-year-old ‘Valencia’ orange (Citrus sinensis (L.) Osbeck) were determined after trees were maintained for 30 consecutive days in controlled growth chambers under high temperature (HT, 32.2°C day/21.1°C night) and low temperature (LT, 15.6°C day/4.4°C night). Leaf CO2 exchange rates (CER), stomatal conductance (Cs), transpiration (E), chlorophyll (Chl), soluble protein, and proline of the LT treatment were 48, 55, 26, 78, 113 and 265%, respectively, of the HT treatment. The water potentials (ψ) of leaves from HT treatment were about 0.5 MPa more negative than those from LT leaves. Activities of ribulose-1,5-bisphosphate carboxylase (RuBPCase) and phosphoenolpyruvate carboxylase (PEPCase) of the HT treatment, expressed on a leaf fresh weight basis, were 91 and 49%, respectively, of the LT treatment. PEPCase of both temperature treatments, however, showed no differences in affinities for HCO3− and PEP, having a Km (HCO3−) of 0.61 mM and a Km (PEP) of 0.15 mM. The ratio of RuBPCase/PEPCase was 6.6 for the HT treatment, compared to 3.5 for the LT treatment. When the 30-day HT-treated trees were transferred to the LT chamber, CER, Cs and ψ, determined 24 hr after transfer, were comparable to values of 30-day LT-treated trees; the RuBPCase activity decreased about 18% and PEPCase activity increased about 31% after 96 hr in the LT chamber. These relative changes decreased the RuBPCase/PEPCase ratio from 6.6 to 3.7. Switching trees from the 30-day LT treatment to the HT chamber resulted in increases in CER, Cs and E and decreases in ψ; the RuBPCase activity decreased about 10%, but PEPCase activity was relatively unaffected after 96 hr following the transfer to the HT chamber. The LT-induced changes in the ratio of carboxylase activities would indicate that some alteration in the photosynthetic carbon metabolism might occur in ‘Valencia’ orange leaf tissues subjected to cold acclimation conditions.</div>
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