Activity of ribulose-1,5-bisphosphate carboxylase in the leaf tissues of blight-affected ‘Valencia’ orange trees ( Citrus sinensis (L.) Osbeck)
Identifieur interne : 004149 ( Main/Exploration ); précédent : 004148; suivant : 004150Activity of ribulose-1,5-bisphosphate carboxylase in the leaf tissues of blight-affected ‘Valencia’ orange trees ( Citrus sinensis (L.) Osbeck)
Auteurs : J. C. V. Vu [États-Unis] ; M. G. Bausher [États-Unis] ; G. Yelenosky [États-Unis]Source :
- Environmental and Experimental Botany [ 0098-8472 ] ; 1987.
Descripteurs français
- Pascal (Inist)
- Wicri :
- topic : Agrume.
English descriptors
- KwdEn :
Abstract
The activities and kinetic properties of ribulose-1,5-bisphosphate carboxylase (RuBPCase) were measured in leaf extracts of ‘Valencia’ orange trees. Enzyme preparations were made from healthy (control) trees and from trees affected by citrus blight, a disease of unknown cause. Activity of RuBPCase decreased in blighted trees as compared with the control, and this decrease was most obvious in the afternoon. The enzyme from leaves of control and blighted trees showed no differences in affinities for CO2 and RuBP, having a Km(CO2) of 25.8 μM and a Km(RuBP) of 210 μM. The Vmax values of the enzyme in blighted trees, however, were only 71 and 74% of those of the control with respect to HCO3− and RuBP concentration, respectively. Zinc concentration was about sixfold higher in trunk wood and twofold higher in leaf tissues of blight-affected trees than control trees. Activity of carbonic anhydrase in leaves of blighted trees was about 69% of the control. Reduced RuBPCase activity is considered one of multiple factors contributing to reduced photosynthetic rates and decreased growth and productivity of blight-affected citrus trees.
Url:
DOI: 10.1016/0098-8472(87)90055-4
Affiliations:
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Le document en format XML
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Enzyme preparations were made from healthy (control) trees and from trees affected by citrus blight, a disease of unknown cause. Activity of RuBPCase decreased in blighted trees as compared with the control, and this decrease was most obvious in the afternoon. The enzyme from leaves of control and blighted trees showed no differences in affinities for CO2 and RuBP, having a Km(CO2) of 25.8 μM and a Km(RuBP) of 210 μM. The Vmax values of the enzyme in blighted trees, however, were only 71 and 74% of those of the control with respect to HCO3− and RuBP concentration, respectively. Zinc concentration was about sixfold higher in trunk wood and twofold higher in leaf tissues of blight-affected trees than control trees. Activity of carbonic anhydrase in leaves of blighted trees was about 69% of the control. 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