Mealiness is one of the most undesirable characteristics of the apple fruit for consumers. The use of integrative approaches has allowed the identification of a novel contributor to the mealiness phenotype in apple and it has been possible to overcome the problems posed by the unavailability of near-isogenic lines to dissect the genetic bases of a complex physiological trait in woody perennial species.Īpple segregating population, α- L-arabinofuranosidase, gene expression, mealiness Introduction
Thus, it is likely to be controlled by endogenous developmental mechanisms associated with fruit ripening. The transcription of MdAF3 is differentially regulated in distinct genomic contexts and appears to be independent of ethylene. The expression levels of the previously uncharacterized apple AF gene MdAF3 are higher in fruits from plants consistently showing mealiness symptons and high α-AFase activity. High levels of activity of α- L-arabinofuranosidase (α-AFase), a hydrolase acting on the pectic component of the cell walls, were found in individuals exhibiting the mealiness phenotype in a segregating population.
In order to investigate the genetic bases of the physiological syndrome mealiness that causes abnormal fruit softening and juice loss in apples, an integrative approach was devised, consisting of sensory, instrumental, biochemical, genetic, and genomic methods.
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