Wide crosses and new genes for wheats for the tropics
1985
Mujeeb-Kazi, A. (CIMMYT, Mexico, DF (Mexico). Wheat Wide Cross Program)
The benefits breeders have derived from alien species through the introgression of alien genetic material are best exemplified by the current CIMMYT 1B/1R wheat lines. Several lines have been released by various countries as varieties because of their wide adaptation, yield stability, aluminum tolerance, and resistance to Septoria tritici. Other institutions have made significant improvements in wheat through alien introgressions, specifically for resistance to the pathogens that cause stem rust, leaf rust, stripe rust, powdery mildew and wheat streak mosaic virus, as well as resistance to greenbug. There have been, however, only a limited number of alien species involved in the above-mentioned studies: Aegilops umbellulata, Agropyron elongatum, Agropyron intermedium, and Secale cereale. Considering the extent of alien germplasm available, the promise of future success is extremely high. The larger the number of alien genera that are combined with wheat and the larger the number of resulting hybrids that are advanced, the more diversified will be the environmental conditions under which wheat production can occur. This potential is the reason for CIMMYT's wide cross program
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