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Genetics, Vol. 177, 2433-2444, December 2007, Copyright © 2007
doi:10.1534/genetics.107.080705
Flowering Time Quantitative Trait Loci Analysis of Oilseed Brassica in Multiple Environments and Genomewide Alignment with Arabidopsis
Y. Long*,
J. Shi*,
D. Qiu*,
R. Li*,
C. Zhang*,
J. Wang*,
J. Hou*,
J. Zhao*,
L. Shi*,
Beom-Seok Park
,
S. R. Choi
,
Y. P. Lim and
J. Meng*,1
* National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan 430070, China, Brassica Genomics Team, National Institute of Agricultural Biotechnology, Rural Development Administration, Suwon 441-707, Republic of Korea and Department of Horticulture, Genome Research Institute, Chungnam National University, Daejeon 305-764, Republic of Korea
1 Corresponding author: National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, 430070, China.
E-mail: jmeng{at}mail.hzau.edu.cn
Most agronomical traits exhibit quantitative variation, which is controlled by multiple genes and are environmentally dependent. To study the genetic variation of flowering time in Brassica napus, a DH population and its derived reconstructed F2 population were planted in 11 field environments. The flowering time varied greatly with environments; 60% of the phenotypic variation was attributed to genetic effects. Five to 18 QTL at a statistically significant level (SL-QTL) were detected in each environment and, on average, two new SL-QTL were discovered with each added environment. Another type of QTL, micro-real QTL (MR-QTL), was detected repeatedly from at least 2 of the 11 environments; resulting in a total of 36 SL-QTL and 6 MR-QTL. Sixty-three interacting pairs of loci were found; 50% of them were involved in QTL. Hundreds of floral transition genes in Arabidopsis were aligned with the linkage map of B. napus by in silico mapping; 28% of them aligned with QTL regions and 9% were consistent with interacting loci. One locus, BnFLC10, in N10 and a QTL cluster in N16 were specific to spring- and winter-cropped environments respectively. The number of QTL, interacting loci, and aligned functional genes revealed a complex genetic network controlling flowering time in B. napus.
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  J. Shi, R. Li, D. Qiu, C. Jiang, Y. Long, C. Morgan, I. Bancroft, J. Zhao, and J. Meng Unraveling the Complex Trait of Crop Yield With Quantitative Trait Loci Mapping in Brassica napus Genetics, July 1, 2009; 182(3): 851 - 861. [Abstract] [Full Text] [PDF]
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 Compiled by, F. Tooke, T. Chiurugwi, and N. Battey Flowering Newsletter bibliography for 2007 J. Exp. Bot., July 18, 2008; (2008) ern109v1. [Full Text] [PDF]
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