Articles
HIGH OR LOW FRUCTOSE? CONSEQUENCES FOR SUGAR METABOLISM IN PEACH FRUIT
Article number
1084_81
Pages
599 – 604
Language
English
Abstract
Fruit taste is largely affected by the content of soluble sugars and organic acids.
Fructose is the sweetest tasting sugar.
In commercial peach fruit, sucrose is the main sugar, followed by fructose and glucose which have similar levels.
Interestingly low fructose accessions have been described in wild peaches.
They display low fructose/ glucose ratio.
Two hypotheses can explain this fructose deficiency: reduced synthesis or increased degradation.
Through an extensive profiling of metabolites and enzymatic activities, this study aims at i) describing sugar metabolism in peach fruit along fruit growth and ii) comparing two genotypes with contrasted fructose/glucose ratios.
We measured 10 metabolites and 12 enzyme activities during fruit growth, for two genotypes over two years.
Such a complete profiling of sugar metabolism along fruit growth has never been performed before for peach fruit.
Genotypic and year effects are observed for all metabolites, whereas a majority of the enzymatic activities are stable between genotypes and years.
More specifically, no difference is detected between the two genotypes in the activities of the enzymes responsible for synthesis or degradation of fructose.
Finally, our results reveal a highly regulated system in which a major perturbation in a central compound has only slight repercussions on sugar metabolism.
Further explanations for the low fructose phenotype are discussed, such as limited fructose storage resulting in higher degradation or a differential consumption of the two hexoses for respiration, synthesis of cell wall or other carbon compounds.
Fructose is the sweetest tasting sugar.
In commercial peach fruit, sucrose is the main sugar, followed by fructose and glucose which have similar levels.
Interestingly low fructose accessions have been described in wild peaches.
They display low fructose/ glucose ratio.
Two hypotheses can explain this fructose deficiency: reduced synthesis or increased degradation.
Through an extensive profiling of metabolites and enzymatic activities, this study aims at i) describing sugar metabolism in peach fruit along fruit growth and ii) comparing two genotypes with contrasted fructose/glucose ratios.
We measured 10 metabolites and 12 enzyme activities during fruit growth, for two genotypes over two years.
Such a complete profiling of sugar metabolism along fruit growth has never been performed before for peach fruit.
Genotypic and year effects are observed for all metabolites, whereas a majority of the enzymatic activities are stable between genotypes and years.
More specifically, no difference is detected between the two genotypes in the activities of the enzymes responsible for synthesis or degradation of fructose.
Finally, our results reveal a highly regulated system in which a major perturbation in a central compound has only slight repercussions on sugar metabolism.
Further explanations for the low fructose phenotype are discussed, such as limited fructose storage resulting in higher degradation or a differential consumption of the two hexoses for respiration, synthesis of cell wall or other carbon compounds.
Publication
Authors
E. Desnoues, V. Signoret, B. Quilot-Turion, V. Baldazzi , M. Génard, Y. Gibon
Keywords
Prunus persica, extensive profiling, metabolites, enzymatic activities, fruits quality
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