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Published in Crop Sci 6:298-300 (1966)
© 1966 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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A Breeding Procedure for the Utilization of Heterosis in Tobacco-Related Species Hybrids1

E. A. Wernsman and D. F. Matzinger2

A technique is described in which the heterosis observed in interspecific hybrids of Nicoriana tabacum L. x N. sylvestris Speg. and Comes and N. tabacum x N.otophora Griesbach could be utilized in flue-cured tobacco breeding programs. The method facilitates the partial substitution of the S genome of N. sylvestris and the T genome of N. otophora for the S and T genomes of N. tabacum independently. This is accomplished by selfing, or selfing and testcrossing to N. tabacum, pentaploid F1 interspecific hybrids of 8x N. tabacum x 2x N. sylvestris and 8x N. tabacum x 2x N. otophora. High yielding species-derived varieties or F1 hybrids between two species derived lines are suggested as a means of utilizing the heterosis from these interspecific hybrids, depending on the type of gene action involved.

1 Contribution from the Departments of Crop Science and Genetics, North Carolina Agricultural Experiment Station, Raleigh, North Carolina, No. 2119 of the Journal Series. This investigation was supported in part by C.S.R.S. Grant No. 427-15-18, and Public Health Service Research Grant GM11546 from the Division of General Medical Sciences.

2 Assistant Professor and Professor of Crop Science and Genetics.

Received for publication January 8, 1966.




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