Abstract
Brassica crops suffer heavily from sclerotinia stem rot which is caused by the necrotrophic fungal pathogen Sclerotinia sclerotiorum. A wild B. oleracea accession, C01 (B. incana), was identified to have good resistance to S. sclerotiorum, while B. rapa was highly susceptible. In order to improve the resistance level of B. rapa, a haploid was generated from a hybridization between a B. rapa accession 6Y733 and C01, where the major resistance quantitative trait loci (QTL) have been identified from chromosome C09. Molecular-assisted selection and resistance evaluation were performed in the backcross progenies with 6Y733 as the recurrent parent. Among 17 BC1F1 plants, one individual with the highest resistance level (1.2- and 1.7-fold higher resistance than 6Y733 in leaf and stem, respectively) and carrying resistance QTL was selected to develop BC2F1. One resistant BC2F1 plant carrying 20 chromosomes and resistance loci, and having similar morphology and fertility to 6Y733, was selected from 254 BC2F1 genotypes and further self-pollinated, resulting in 145 BC2F2 individual genotypes. One individual carrying 20 chromosomes and with good fertility (98.6 %) exhibited a significant higher resistance level than the parental B. rapa line (1.4- and 1.7-fold for leaf and stem resistance, respectively). Our data suggest that it is an effective strategy to transfer sclerotinia resistance from B. oleracea into B. rapa by using a haploid strategy which could prompt the genetic exchange of the A and C genomes.
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Acknowledgments
This study was financially supported by the 973 Program (2015CB150201), Key Projects in National Science and Technology (2014BAD01B07), National Nature Science Foundation of China (31401411 and 31171585), CSTC2012ggB80008 and CSTC2014yykfA80008.
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Ding, Y., Mei, J., Liu, Y. et al. Transfer of sclerotinia stem rot resistance from wild Brassica oleracea into B. rapa . Mol Breeding 35, 225 (2015). https://doi.org/10.1007/s11032-015-0392-4
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DOI: https://doi.org/10.1007/s11032-015-0392-4