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The genetic basis of flowering time and photoperiod sensitivity in rapeseed Brassica napus L.

  • Plant Genetics
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Abstract

The objective of this study was to dissect the genetic control of days to flowering (DTF) and photoperiod sensitivity (PS) into the various components including the main-effect quantitative trait loci (QTLs), epistatic QTLs and QTL-by-environment interactions (QEs). Doubled haploid (DH) lines were produced from an F1 between two spring Brassica napus cultivars Hyola 401 and Q2. DTF of the DH lines and parents were investigated in two locations, one location with a short and the other with a long photoperiod regime over two years. PS was calculated by the delay in DTF under long day as compared to that under short day. A genetic linkage map was constructed that comprised 248 marker loci including SSR, SRAP, and AFLP markers. Further QTL analysis resolved the genetic components of flowering time and PS into the main-effect QTLs, epistatic QTLs, and QEs. A total of 7 main-effect QTLs and 11 digenic interactions involving 21 loci located on 13 out of the 19 linkage groups were detected for the two traits. Three main-effect QTLs and four pairs of epistatic QTLs were involved in QEs conferring DTF. One QTL on linkage group (LG) 18 was revealed to simultaneously affect DTF and PS and explain for the highest percentage of the phenotypic variation. The implications of the results for B. napus breeding have been discussed.

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Authors and Affiliations

  1. National Key Laboratory of Crop Genetic Improvement, Huazhong Agricultural University, Wuhan, Hubei Province, 430070, China

    C. C. Cai, J. X. Tu, T. D. Fu & B. Y. Chen

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  1. C. C. Cai
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  2. J. X. Tu
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  3. T. D. Fu
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  4. B. Y. Chen
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Correspondence to J. X. Tu.

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Cai, C.C., Tu, J.X., Fu, T.D. et al. The genetic basis of flowering time and photoperiod sensitivity in rapeseed Brassica napus L.. Russ J Genet 44, 326–333 (2008). https://doi.org/10.1134/S1022795408030137

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  • DOI: https://doi.org/10.1134/S1022795408030137

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