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JXB Advance Access published online on November 28, 2007
Journal of Experimental Botany, doi:10.1093/jxb/erm255
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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

Quantitative trait loci for flowering time and morphological traits in multiple populations of Brassica rapa

Ping Lou1 *, Jianjun Zhao1,2,3,5,6 *, Jung Sun Kim4, Shuxing Shen2, Dunia Pino Del Carpio1, Xiaofei Song2, Mina Jin4, Dick Vreugdenhil6, Xiaowu Wang3, Maarten Koornneef5,7 and Guusje Bonnema1,{dagger}

1Laboratory of Plant Breeding, Wageningen University, Droevendaalsesteeg 1, 6708 PB Wageningen, The Netherlands
2Horticultural College, Hebei Agricultural University, Hebei Province, Baoding 071001, China
3Institute of Vegetables and Flowers, Chinese Academy of Agricultural Sciences, 12 Zhongguancun Nandajie, Beijing 100081, China
4Brassica Genomics Team, National Institute of Agricultural Biotechnology, 225 Seodun-Dong, Suwon, 441–707, South Korea
5Laboratory of Genetics, Wageningen University, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands
6Laboratory of Plant Physiology, Wageningen University, Arboretumlaan 4, 6703 BD Wageningen, The Netherlands
7Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, 50829 Cologne, Germany

{dagger} To whom correspondence should be addressed. E-mail: guusje.bonnema{at}wur.nl

Wide variation for morphological traits exists in Brassica rapa and the genetic basis of this morphological variation is largely unknown. Here is a report on quantitative trait loci (QTL) analysis of flowering time, seed and pod traits, growth-related traits, leaf morphology, and turnip formation in B. rapa using multiple populations. The populations resulted from crosses between the following accessions: Rapid cycling, Chinese cabbage, Yellow sarson, Pak choi, and a Japanese vegetable turnip variety. A total of 27 QTL affecting 20 morphological traits were detected, including eight QTL for flowering time, six for seed traits, three for growth-related traits and 10 for leaf traits. One major QTL was found for turnip formation. Principal component analysis and co-localization of QTL indicated that some loci controlling leaf and seed-related traits and those for flowering time and turnip formation might be the same. The major flowering time QTL detected in all populations on linkage group R02 co-localized with BrFLC2. One major QTL, controlling turnip formation, was also mapped at this locus. The genes that may underly this QTL and comparative analyses between the four populations and with Arabidopsis thaliana are discussed.

Key words: Brassica rapa, comparative mapping, flowering time, morphological traits, multiple populations, quantitative trait loci

* These authors contributed equally to this work.

Received 29 May 2007; Revised 18 September 2007 Accepted 20 September 2007


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