Publication Overview
Abstract Fruit shape is a critical appearance quality
in apple. Quantitative trait loci (QTLs) for apple fruit
shape index (FSI) traits were previously mapped by
our laboratory to linkage group 11 of the maternal
parent in a cross population of ‘Jonathan’ 9 ‘Golden
Delicious’ using simple sequence repeat markers. In
this study, QTLs for fruit length, diameter, and FSI
were identified again using a high-density single
nucleotide polymorphism (SNP) genetic linkage map,
and candidate genes associated with FSI were
screened via whole-genome re-sequencing data for
‘Jonathan’ and ‘Golden Delicious’. Fifteen QTLs,
including four for fruit length, one for fruit diameter,
and ten for FSI, were identified in three sampling
years. Two overlapping year-stable QTL regions
related to FSI were anchored on LG 11 of ‘Jonathan’.
One candidate gene (MDP0000135244) related to FSI
in apple and encoding an LysM domain receptor-like
kinase protein was predicted and verified in the
segregated population. The nonsynonymous SNP
(C11.6053728) of MDP0000135244 was present in
23 of 30 individuals with high FSI, demonstrating a
close relationship between MDP0000135244 and FSI
trait. These results will be useful for the application of
marker-assisted selection for FSI trait in apple.
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