Abstract
Considerable genotypic variation exists in the response of different cultivars of rapeseed (Brassica napus) to B deficiency. This raises the possibility of genetic improvement of a B nutrition trait that will make the plant more tolerant to low B stress. The results of our study showed that B-efficient backcross plants had lower B concentration and more dry matter when grown at low levels of B when compared with the recurrent parent. Accordingly, we proposed that the improved B efficiency was attributed to either a high B utilization efficiency or less demand for B. The results of the genetic analysis showed that B efficiency is a dominant trait that is controlled by a single locus, namely BnBE2. By using bulked segregant analysis (BSA) in combination with amplified fragment length polymorphism (AFLP) and sequence related amplified polymorphism (SRAP) techniques, five SRAP markers and one converted single strand conformation polymorphism (SSCP) marker were identified to be linked to BnBE2 after screening 1,800 primer combinations. The six markers together with BnBE2 were mapped in a region that covered a genetic distance of 6.9 cM on a linkage group using a BC6 population. This region was located on linkage group N14 after mapping these markers in two doubled haploid (DH) populations (TNDH and BQDH). The SRAP and AFLP markers were sequenced and found to be homologous to a BAC sequence from Brassica oleracea (CC). This finding suggested that the segment containing BnBE2 locus originated from the C genome of Brassica oleracea. Three SSR markers were identified to be linked to BnBE2 through comparative mapping. All these markers might have potential value for facilitating the pyramiding of the BnBE2 gene with other B efficient genes in order to improve the B efficiency trait and for further fine mapping of the BnBE2 gene in Brassica napus.
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Abbreviations
- AFLP:
-
Amplified fragment length polymorphism
- B:
-
Boron
- BC:
-
Backcross
- BSA:
-
Bulked segregation analysis
- NIL:
-
Near isogenic line
- QTL:
-
Quantitative trait loci
- SRAP:
-
Sequence related amplified polymorphism
- SSCP:
-
Single strand conformation polymorphism
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Acknowledgments
This work was supported by grants from the National Natural Science Foundation of China (30771283), the Program for New Century Excellent Talents, Ministry of Education, China (NCET-05-0666) and the National 863 High Technology Program (2007AA10Z117).
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Zhao, H., Shi, L., Duan, X. et al. Mapping and validation of chromosome regions conferring a new boron-efficient locus in Brassica napus . Mol Breeding 22, 495–506 (2008). https://doi.org/10.1007/s11032-008-9193-3
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DOI: https://doi.org/10.1007/s11032-008-9193-3