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Dep. of Agronomy and Horticulture, New Mexico State Univ., Las Cruces, NM 88003-0003
USDA-ARS, Northern Crop Science Lab., Box 5677, State University Station, Fargo, ND 58105
* Corresponding author.
Utilization of related wild species for genetic improvement of durum wheat (Triticum turgidum L. var. durum) has been limited by the lack of suitable cytogenetic stocks. This study was conducted to identify the chromosomal location of genes influencing quantitative traits in wild emmer (T. turgidum L. var. dicoccoides). Thirteen of the possible 14 disomic substitution lines of ‘Langdon’ durum wheat (LDN), each containing a different individual chromosome pair of T. turgidum var. dicoccoides (accession FA-15-3 = DIC), were compared with each other and with the recipient parent LDN in a replicated experiment at Langdon and Prosper, ND, in 1988 and 1989. Some genotypes with a DIC chromosome 4A or a 4B pair exhibited an average of 39% higher grain yield than LDN. Genotypes with DIC chromosomes 6B had the highest grain protein yield (14.0 g m–2) compared with LDN (10.6 g m–2) and did not differ significantly from LDN for kernel weight. Genotypes with DIC chromosomes 5B had the highest kernel weight (42.3 mg) of all of those tested. The earliest-maturing genotypes contained the DIC chromosome pair 6A. Genotypes possessing a DIC chromosome pair 4A, 5A, 5B, 6B, or 7B were significantly taller than LDN. Results indicated that important agronomic traits in cultivated durum wheat can be improved by introgressing genes from wild emmer using chromosome substitution lines that overcome many of the problems of conventional wide hybrids. It is important to derive several genotypes that possess a particular DIC chromosome pair, since genetic heterogeneity was detected even after five backcrosses to LDN.
Received for publication May 7, 1990.
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