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JXB Advance Access originally published online on December 16, 2008
Journal of Experimental Botany 2009 60(1):325-337; doi:10.1093/jxb/ern294
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© 2008 The Author(s).
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/2.0/uk/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited. This paper is available online free of all access charges (see http://jxb.oxfordjournals.org/open_access.html for further details)

RESEARCH PAPER

Flavour compounds in tomato fruits: identification of loci and potential pathways affecting volatile composition

Sandrine Mathieu1, Valeriano Dal Cin1, Zhangjun Fei2, Hua Li3, Peter Bliss1, Mark G. Taylor1, Harry J. Klee1,* and Denise M. Tieman1

1Plant Molecular and Cellular Biology Program, University of Florida, Horticultural Sciences, PO Box 110690, Gainesville FL 32611, USA
2Boyce Thompson Institute, Cornell University, Ithaca, NY 14853, USA and USDA Robert W Holley Center for Agriculture and Health, Ithaca, NY 14853, USA
3Bioinformatics Center, Stowers Institute for Medical Research, Kansas City, Missouri 64110, USA

* To whom correspondence should be addressed: E-mail: hjklee{at}ifas.ufl.edu

The unique flavour of a tomato fruit is the sum of a complex interaction among sugars, acids, and a large set of volatile compounds. While it is generally acknowledged that the flavour of commercially produced tomatoes is inferior, the biochemical and genetic complexity of the trait has made breeding for improved flavour extremely difficult. The volatiles, in particular, present a major challenge for flavour improvement, being generated from a diverse set of lipid, amino acid, and carotenoid precursors. Very few genes controlling their biosynthesis have been identified. New quantitative trait loci (QTLs) that affect the volatile emissions of red-ripe fruits are described here. A population of introgression lines derived from a cross between the cultivated tomato Solanum lycopersicum and its wild relative, S. habrochaites, was characterized over multiple seasons and locations. A total of 30 QTLs affecting the emission of one or more volatiles were mapped. The data from this mapping project, combined with previously collected data on an IL population derived from a cross between S. lycopersicum and S. pennellii populations, were used to construct a correlational database. A metabolite tree derived from these data provides new insights into the pathways for the synthesis of several of these volatiles. One QTL is a novel locus affecting fruit carotenoid content on chromosome 2. Volatile emissions from this and other lines indicate that the linear and cyclic apocarotenoid volatiles are probably derived from separate carotenoid pools.

Key words: Apocarotenoids, flavour, metabolism, quantitative trait loci, Solanum lycopersicum

Received 20 August 2008; Revised 3 October 2008 Accepted 27 October 2008


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