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Transgressive Segregation in Spring Wheats¹

Crop improvement by hybridization often is described as a method of recombining desired characters as they are found in the two parents. This concept may imply that improvement is limited to the character range of the parents. Plant breeders have found that transgressive segregation for many important characters is of common occurrence if breeding methods such as early backcrossing do not preclude its detection. Examples of useful transgressive segregation are illustrated with the following durums and hard red spring wheats which have been released from North Dakota State University: straw strength — ‘Carleton’ durum; yield — ‘Stewart’ durum; early maturity — ‘Vernum’ durum; macaroni color — ‘Nugget’ durum; milling and baking qualities — ‘Conley’ hard red spring; and stem rust resistance — ‘Justin’ hard red spring. In each example the probable desirability of the parents was established by progeny testing before the last cross was made, and the character displaying transgressive segregation was not one of the prime characters to be recovered. The diversity of the characters exemplifying transgressive segregation encourages further exploitation.

² Professor of Agronomy, North Dakota State University.

Received for publication February 5, 1966.