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Published on July 14, 2006; 10.1104/pp.106.083279

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Received May 8, 2006
Accepted July 3, 2006

Genetic control of fruit vitamin C contents

Mark W. Davey *, Katrien Kenis , and Johan Keulemans

Laboratory for Fruit Breeding and Biotechnology, Department of Biosystems, Faculty of Applied Biosciences and Bioengineering, Catholic University of Leuven, De Croylaan 42, B-3001, Heverlee, Belgium

* Corresponding author; email: mark.davey{at}biw.kuleuven.be.

An F1 progeny derived from a cross between the apple (Malus x domestica) cultivars ‘Telamon’ and ‘Braeburn’ was used to identify quantitative trait loci (QTLs) linked to the vitamin C (L-ascorbate, L-AA) contents of fruit skin and flesh (cortex) tissues. We identified up to 3 highly significant QTLs for both the mean L-AA and the mean total L-AA contents of fruit flesh on both parental genetic linkage maps, confirming the quantitative nature of these traits. These QTLs account for up to a maximum of 60% of the total population variation observed in the progeny, and with a maximal individual contribution of 31% per QTL. QTLs common to both parents were identified on linkage groups (LGs) 6, 10, and 11 of the Malus reference map, while each parent also had additional unique QTLs on other LGs. Interestingly, one strong QTL on LG-17 of the Telamon linkage map colocalised with a highly-significant QTL associated with flesh browning, and a minor QTL for dehydroascorbate (DHA) content, supporting earlier work that links fruit L-AA contents with the susceptibility of hardfruit to post-harvest browning. We also found significant minor QTLs for skin L-AA and total L-AA (L-AA + DHA) contents in Telamon. Currently little is known about the genetic determinants underlying tissue L-AA homeostasis, but the presence of major, highly significant QTL in both these apple genotypes under field conditions suggests the existence of common control mechanisms, allelic heterozygosity and helps outline strategies and the potential for the molecular breeding of these traits.




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