Publication Overview
Abstract Background: Russeting is a disorder developed by apple fruits that consists of cuticle cracking followed by the
replacement of the epidermis by a corky layer that protects the fruit surface from water loss and pathogens.
Although influenced by many environmental conditions and orchard management practices, russeting is under
genetic control. The difficulty in classifying offspring and consequent variable segregation ratios have led several
authors to conclude that more than one genetic determinant could be involved, although some evidence favours a
major gene (Ru).
Results: In this study we report the mapping of a major genetic russeting determinant on linkage group 12 of apple
as inferred from the phenotypic observation in a segregating progeny derived from ‘Renetta Grigia di Torriana’, the
construction of a 20 K Illumina SNP chip based genetic map, and QTL analysis. Recombination analysis in two mapping
populations restricted the region of interest to approximately 400 Kb. Of the 58 genes predicted from the Golden
Delicious sequence, a putative ABCG family transporter has been identified. Within a small set of russeted cultivars
tested with markers of the region, only six showed the same haplotype of ‘Renetta Grigia di Torriana’.
Conclusions: A major determinant (Ru_RGT) for russeting development putatively involved in cuticle organization is
proposed as a candidate for controlling the trait. SNP and SSR markers tightly co-segregating with the Ru_RGT locus
may assist the breeder selection. The observed segregations and the analysis of the ‘Renetta Grigia di Torriana’
haplotypic region in a panel of russeted and non-russeted cultivars may suggest the presence of other determinants
for russeting in apple.
Features
This publication contains information about 46 features:
PagesProjects
This publication contains information about 1 projects:
Stocks
This publication contains information about 5 stocks:
|