Abstract
Protoplast fusion may be used to introgress desirable traits from wild species into cultivated potato which are cross incompatible. However, none of commercial varieties have been developed from hyper-tetraploid somatic hybrids because of the unpredictable heredity associated with irregular chromosome segregation during meiosis. A pentaploid somatic hybrid (SH) from Solanum chacoense + S. tuberosum, 3C28-1, which carries bacterial wilt (BW) resistance from the wild species, was employed in the present research. Gamete genotypes and inheritance pattern of SH 3C28-1 were estimated by counting the chromosome numbers and detecting the parent-specific SSR alleles in a backcross population of SH 3C28-1 × E-Potato 1 (variety) which is BW susceptible. The SSR alleles retained from S. chacoense were analyzed for association with BW resistance and evaluation of wild species genetic background. Our results implied that SH 3C28-1 could produce viable gametes of n = 2x = 24 + a where a ≤ 6, which are compatible with a tetraploid pollen source to yield a high proportion of tetraploids and aneuploids with chromosome numbers between 48 and 54. Sixty-four of 83 SH 3C28-1-specific SSR alleles fit the tetrasomic or disomic/tetrasomic segregation ratio of a tetraploid, suggesting that the pentaploid mainly exhibits tetraploid inheritance pattern. Four (three positive and one negative) alleles were estimated to associate with BW resistance and backcross clones were selected for preserving less wild species genetic background and harboring the resistance. The present research elucidates the inheritance pattern of the pentaploid somatic hybrid to provide a theoretical and applied foundation for use of the pentaploid in potato breeding.
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Acknowledgments
The work was supported by the earmarked fund for Modern Agro-industry Technology Research System (nycytx-15), the special fund for agro-scientific research in the public interest from the Ministry of Agriculture, China (201303007) and the Ministry of Education of China (IRT13065).
Authors’ contributions
LC conducted the SSR marker selection, bacterial wilt assessment and paper drafting; XG constructed the backcrossing population and investigated the agronomic traits; HW and LH conducted the chromosome counting; JZ assisted on genetic analysis; XC reviewed the progress of the experiments; CX advised on data analysis and paper drafting; JL designed and supervised the study. All the authors read and approved the manuscript.
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Lin Chen and Xianpu Guo have contributed equally to this work.
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Supplementary Fig. 1
Flowers of the parents: a. The pentaploid somatic hybrid Solanum chacoense (+) S. tuberosum, 3C28-1, b Tetraploid potato cv. E1 and c. Genotype BC1.17 of the progeny (2n = 52)
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Chen, L., Guo, X., Wang, H. et al. Tetrasomic inheritance pattern of the pentaploid Solanum chacoense (+) S. tuberosum somatic hybrid (resistant to bacterial wilt) revealed by SSR detected alleles. Plant Cell Tiss Organ Cult 127, 315–323 (2016). https://doi.org/10.1007/s11240-016-1051-0
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DOI: https://doi.org/10.1007/s11240-016-1051-0