Abstract
Tuber soft rot and early blight are serious potato diseases. Development of potato varieties resistant to these diseases has been hindered by the scarcity of resistant germplasm. A diploid wild species, Solanum brevidens, shows significant resistance to both diseases. Numerous potato breeding lines have been developed from a potato-S. brevidens somatic hybrid, A206. A BC3 clone, C75-5+297, derived from this somatic hybrid as well as its BC1 and BC2 parental lines showed resistance to both tuber soft rot and early blight. Clone C75-5+297 has consistently out-yielded common varieties under disease stress. Using both molecular and cytogenetic approaches we demonstrated that a single copy of chromosome 8 from S. brevidens replaced a potato chromosome 8 in C75-5+297. Thus, C75-5+297 represents a potato-S. brevidens chromosome substitution line. Our results suggest that the presence of a single chromosome from S. brevidens may significantly impact the resistance to multiple potato diseases. The high yield potential of C75-5+297 makes it an excellent parent for developing potato varieties with resistances to both tuber soft rot and early blight.
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Acknowledgements
A.L.T. acknowledges a scholarship from the Ministry of Turkish National Education for graduate studies. We are grateful to Dr. J.M. McGrath for valuable discussions on the resistance to soft rot, Dr. R.V. James for evaluation of early blight development in the field and Dr. S.K. Naess and S. Wielgus for assistance with the Southern blot hybridizations. This research is partially supported by Hatch funds and funds from Wisconsin Potato & Vegetable Growers Association to J.J.
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Communicated by J.S. Heslop-Harrison
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Tek, A.L., Stevenson, W.R., Helgeson, J.P. et al. Transfer of tuber soft rot and early blight resistances from Solanum brevidens into cultivated potato. Theor Appl Genet 109, 249–254 (2004). https://doi.org/10.1007/s00122-004-1638-4
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DOI: https://doi.org/10.1007/s00122-004-1638-4