Biologia plantarum 56:1-8, 2012 | DOI: 10.1007/s10535-012-0008-3

Interspecific somatic hybrids between Solanum bulbocastanum and S. tuberosum and their haploidization for potato breeding

M. Iovene1, R. Aversano2, S. Savarese2, I. Caruso2, A. Di Matteo2, T. Cardi3, L. Frusciante2, D. Carputo2,*
1 Institute of Plant Genetics, Res. Div. Bari, CNR-IGV, Bari, Italy
2 Department of Soil, Plant, Environmental and Animal Production Sciences, University of Naples Federico II, Portici, Italy
3 Institute of Plant Genetics, Res. Div. Portici, CNR-IGV, Portici, Italy

Protoplast fusion between incongruent Solanum bulbocastanum and S. tuberosum haploids was accomplished to produce hybrids combining elite traits from both parents. We identified 11 somatic hybrids out of 42 regenerants analyzed through ISSR markers. Some hybrids had loss or gain of fragments compared to the parents, likely due to rearrangements and deletions of chromosome segments after fusion, and/or to somaclonal variation during hybrid regeneration. Increased heterotic vigor for some traits as well as high diversity was observed as the effect of both ploidy and fusion combination. Microsporogenesis analysis indicated the occurrence of multivalent configurations and several meiotic abnormalities, such as chromosomes bridges and various spindle orientations. Since all hybrids were sterile, in vitro anther culture was employed for haploidization as a possible strategy to overcome barriers to hybridizations. Haploids were obtained from all the tetraploid S. bulbocastanum (+) S. tuberosum somatic hybrids tested, although with differences in both the number of embryos per 100 anthers cultured and the number of differentiated green plantlets. This is the first report on the successful production of haploid plants from S. bulbocastanum (+) S. tuberosum hybrids.

Keywords: androgenesis; microsporogenesis; molecular markers; somaclonal variation
Subjects: microsporogenesis; molecular markers; somaclonal variation; somatic hybrids; haploidization; androgenesis
Species: Solanum bulbocastanum; Solanum tuberosum

Received: October 23, 2009; Accepted: June 9, 2010; Published: March 1, 2012Show citation

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Iovene, M., Aversano, R., Savarese, S., Caruso, I., Matteo, A., Cardi, T., Frusciante, L., & Carputo, D. (2012). Interspecific somatic hybrids between Solanum bulbocastanum and S. tuberosum and their haploidization for potato breeding. Biologia plantarum, 56(1), 1-8. doi: 10.1007/s10535-012-0008-3.
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