QTL validation and stability for volatile organic compounds (VOCs) in apple
Publication Overview
Abstract The aroma trait in apple is a key factor for fruit quality strongly affecting the consumer appreciation,
and its detection and analysis is often an extremely laborious and time consuming procedure. Molecular
markers associated to this trait can to date represent a valuable selection tool to overcome these limitations.
QTL mapping is the first step in the process oftargeting valuable molecular markers to be employed
in marker-assisted breeding programmes (MAB). However, a validation step is usually required before
a newly identified molecular marker can be implemented in marker-assisted selection. In this work the
position of a set of QTLs associated to volatile organic compounds (VOCs) was confirmed and validated
in three different environments in Switzerland, namely Wädenswil, Conthey and Cadenazzo, where the
progeny ‘Fiesta × Discovery’ was replicated. For both QTL identification and validation, the phenotypic
data were represented by VOCs produced by mature apple fruit and assessed with a Proton Transfer
Reaction-Mass Spectrometer (PTR-MS) instrument. The QTL-VOC combined analysis performed among
these three locations validated the presence of important QTLs in three specific genomic regions, two
located in the linkage group 2 and one in linkage group 15, respectively, for compounds related to esters
(m/z 43, 61 and 131) and to the hormone ethylene (m/z 28). The QTL set presented here confirmed that
in apple some compounds are highly genetically regulated and stable across environments.
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