Journal Article

Quantitative trait loci for flowering time and morphological traits in multiple populations of <i>Brassica rapa</i>

Ping Lou, Jianjun Zhao, Jung Sun Kim, Shuxing Shen, Dunia Pino Del Carpio, Xiaofei Song, Mina Jin, Dick Vreugdenhil, Xiaowu Wang, Maarten Koornneef and Guusje Bonnema

in Journal of Experimental Botany

Published on behalf of Society for Experimental Biology

Volume 58, issue 14, pages 4005-4016
Published in print November 2007 | ISSN: 0022-0957
Published online November 2007 | e-ISSN: 1460-2431 | DOI: https://dx.doi.org/10.1093/jxb/erm255

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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.

Keywords: Brassica rapa; comparative mapping; flowering time; morphological traits; multiple populations; quantitative trait loci

Journal Article.  6032 words.  Illustrated.

Subjects: Plant Sciences and Forestry

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