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JXB Advance Access originally published online on February 5, 2007
Journal of Experimental Botany 2007 58(6):1339-1349; doi:10.1093/jxb/erl301
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© 2007 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

Morphological variation in tomato: a comprehensive study of quantitative trait loci controlling fruit shape and development

Marin Talbot Brewer1, Jennifer B. Moyseenko1, Antonio J. Monforte2 and Esther van der Knaap1,*

1Department of Horticulture and Crop Science, The Ohio State University/OARDC, 1680 Madison Avenue, Wooster, OH 44691, USA
2IRTA Carretera de Cabrils Km 2, E-08348 Cabrils, Barcelona, Spain

* To whom correspondence should be addressed. E-mail: vanderknaap.1{at}osu.edu

Variation in fruit morphology is a prevalent characteristic among cultivated tomato. The genetic and developmental mechanisms underlying similarities and differences in shape between the fruit of two elongated tomato varieties were investigated. Fruit from two F2 populations constructed from either Solanum lycopersicum cv. Howard German or cv. Banana Legs crossed with S. pimpinellifolium accession LA1589, and one BC1 population constructed with S. lycopersicum Howard German as the recurrent parent, were analysed for shape by using a new software program Tomato Analyzer. Quantitative trait loci (QTLs) controlling 15 individual shape attributes were mapped by both single and multitrait composite interval mapping in each population. In addition, principal components analysis and canonical discriminant analysis were conducted on these shape attributes to determine the greatest sources of variation among and between the populations. Individual principal components and canonical variates were subjected to QTL analysis to map regions of the genome influencing fruit shape in the cultivars. Common and unique regions, as well as previously known and novel QTLs, underlying fruit morphology in tomato were identified. Four major loci were found to control multiple fruit shape traits, principal components, and canonical variates in the populations. In addition, QTLs associated with the principal components better revealed regions of the genome that varied among populations than did the QTL associated with canonical variates. The QTL identified can be compared across additional populations of tomato and other fruit-bearing crop species.

Key words: Development, fruit shape, principal components analysis, quantitative trait loci, tomato

Received 13 August 2006; Revised 10 November 2006 Accepted 12 December 2006


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