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Production and characterization of interspecific somatic hybrids between Brassica oleracea var. botrytis and B. nigra and their progenies for the selection of advanced pre-breeding materials

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Abstract

Somatic hybridization is a potential method for gene transfer from wild relatives to cultivated crops that can overcome sexual incompatibilities of two distantly related species. In this study, interspecific asymmetric somatic hybrids of Brassica oleracea var. botrytis (cauliflower) and Brassica nigra (black mustard) were obtained by protoplast fusion and their backcrossed (BC3) and selfed (S3) offspring were analyzed. Cytological analysis showed that the B. nigra chromosomes were successively eliminated in the backcrosses with cauliflower. The fertility of the hybrid progenies was quite different due to the asynchronous and abnormal chromosome behavior of pollen mother cells (PMC) during meiosis. Analysis of sequence-related amplified polymorphism (SRAP) showed that all of these hybrids mainly had the DNA banding pattern from the two parents with some alterations. Genetically, the selfed generations were closer to B. nigra, while the backcrossed generations were closer to the cauliflower parent. Analysis of cleaved amplified polymorphic sequences (CAPS) and restriction fragment length polymorphisms (RFLP) showed that all somatic hybrids in this study contained chloroplast (cp) DNA of the donor parent black mustard, while mitochondrial (mt) DNA showed evidence of recombination and variations in the regions analyzed. Furthermore, three BC3 plants (originated from somatic hybrids 3, 4, 10) with 2–8 B. nigra-derived chromosomes shown by genomic in situ hybridization (GISH) displayed a more cauliflower-like morphology and high resistance to black-rot. These plants were obtained as bridge materials for further analysis and breeding.

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Acknowledgments

This study was supported by grants from Natural Science Foundation of China (30771206), (31000538) and project of technology innovation ability from Beijing Academy of Agriculture and Forestry Sciences (KJCX201101010-19). Our researches on somatic hybridization benefited from the ‘Sino-Germany Cooperation on Agricultural Science and Technology’.

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Authors and Affiliations

  1. Beijing Vegetable Research Center, National Engineering Research Center for Vegetables, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, People’s Republic of China

    Gui-xiang Wang, Yu Tang, Xiao-guang Sheng, Wei-wei Hao, Li Zhang, Kun Lu & Fan Liu

  2. Institute of Plant and Environmental Protection, Beijing Academy of Agriculture and Forestry Sciences, Beijing, 100097, People’s Republic of China

    Hong Yan

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  1. Gui-xiang Wang
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  2. Yu Tang
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  3. Hong Yan
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  4. Xiao-guang Sheng
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  5. Wei-wei Hao
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  6. Li Zhang
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  7. Kun Lu
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  8. Fan Liu
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Correspondence to Fan Liu.

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Communicated by A.-C. Schmit.

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Wang, Gx., Tang, Y., Yan, H. et al. Production and characterization of interspecific somatic hybrids between Brassica oleracea var. botrytis and B. nigra and their progenies for the selection of advanced pre-breeding materials. Plant Cell Rep 30, 1811–1821 (2011). https://doi.org/10.1007/s00299-011-1088-9

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  • DOI: https://doi.org/10.1007/s00299-011-1088-9

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