Dynamic QTLs for sugars and enzyme activities provide an overview of genetic control of sugar metabolism during peach fruit development
Publication Overview
Abstract Knowledge of the genetic control of sugar metabolism is essential to enhance fruit quality and promote fruit consumption.
The sugar content and composition of fruits varies with species, cultivar and stage of development, and is
controlled by multiple enzymes. A QTL (quantitative trait locus) study was performed on peach fruit [Prunus persica
(L.) Batsch], the model species for Prunus. Progeny derived from an interspecific cross between P. persica cultivars
and P. davidiana was used. Dynamic QTLs for fresh weight, sugars, acids, and enzyme activities related to sugar
metabolism were detected at different stages during fruit development. Changing effects of alleles during fruit growth
were observed, including inversions close to maturity. This QTL analysis was supplemented by the identification of
genes annotated on the peach genome as enzymes linked to sugar metabolism or sugar transporters. Several cases
of co-locations between annotated genes, QTLs for enzyme activities and QTLs controlling metabolite concentrations
were observed and discussed. These co-locations raise hypotheses regarding the functional regulation of sugar
metabolism and pave the way for further analyses to enable the identification of the underlying genes. In conclusion,
we identified the potential impact on fruit breeding of the modification of QTL effect close to maturity.
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