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A Comparison of Early Generation (F₃) Yield Testing and Pedigree Selection Methods in Triticale¹

During the summer of 1974, four F₃ populations of hexaploid triticale (X Triticosecale Wittmack) were evaluated for yield in an F₃ yield nursery and concurrently in a head-row nursery. Ten high-yielding, 10 lowyielding, and 10 randomly sampled lines along with 10 lines selected visually for yield in the head row nursery were retained for further evaluation. Lines from each of the four selection groups in each population were bulked and compared in a 10-replicate yield trial at Obregon, Mexico, during the winter of 1975-76. The analyses indicated that no significant differences existed between bulks produced from high-yielding lines selected by the early generation yield trial and the head row nursery. Both yield trial and head row bulks were superior in yield to the bulk of randomly sampled lines at all locations. The present results indicate that pedigree selection and early generation yield testing procedures are equally efficient methods for yield selection in triticale.

Key Words: Breeding methodology • Wheatrye hybrid • X Triticosecale • Wittmack • Bulk selection method

² Former graduate student, now at Zambia-Canada Wheat Project, Zambia, Africa; professor, and associate professor, respectively, Plant Science Dep., Univ. of Manitoba, Winnipeg, Manitoba, Canada R3T 2X1.