Abstract
Cultivated tobacco (Nicotiana tabacum L.) is a classic amphidiploid, and hybrids between this cultivated species and closely related diploid Nicotiana relatives often exhibit heterotic effects for growth rate and yield. Crosses between N. tabacum and synthetic tobaccos, 4x(Nicotiana sylvestris × Nicotiana otophora) or 4x(N. sylvestris × Nicotiana tomentosiformis), may provide superior routes for genome-wide introgression from diploid relatives and allow increased potential to capitalize on heterotic effects in tobacco. Significant levels of mid-parent heterosis were observed for yield and growth rate in F1 hybrids between synthetic tobaccos and a standard tobacco cultivar. Microsatellite marker genotyping of an F2 population derived from a K326 × [4x(N. sylvestris × N. otophora)] cross was carried out to preliminarily investigate the relative importance of different types of gene action on observed heterosis in the original interspecific cross. Results suggested a role for both partial dominance and overdominance. Marker genotyping also indicated an overall reduced level of recombination in the N. tabacum × synthetic tobacco cross relative to a N. tabacum × N. tabacum cross but no evidence of genomic regions with severely restricted levels of recombination. Results suggest that populations derived from N. tabacum × synthetic tobacco crosses may be more efficient for introgressing germplasm from diploid relatives, as compared to populations derived from crosses between N. tabacum and diploid forms where preferential pairing between N. tabacum homologues can reduce the potential for introgression of alien chromatin. Such materials may be useful as sources of favorable alleles influencing quantitative characters in tobacco.
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WGH performed the research, helped to analyze the data, and helped draft the manuscript. RSL designed the research, helped to analyze the data, and wrote the manuscript.
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Key Message: Tobacco (N. tabacum) hybrids with synthetic tobaccos, 4x(N. sylvestris × N. otophora) or 4x(N. sylvestris × N. tomentosiformis), exhibit heterotic effects for yield and growth rate. Genetic recombination is suppressed in such crosses, but germplasm exchange on all chromosomes is relatively free-flowing. Synthetic tobaccos offer a superior system for introgressing genetic diversity into N. tabacum from closely related diploid relatives.
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Hancock, W.G., Lewis, R.S. Heterosis, transmission genetics, and selection for increased growth rate in a N. tabacum × synthetic tobacco cross. Mol Breeding 37, 53 (2017). https://doi.org/10.1007/s11032-017-0654-4
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DOI: https://doi.org/10.1007/s11032-017-0654-4