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Empirical Evaluation of Single-Plant and Family Selection Strategies in Wheat¹

Random F₃ families from the cross of two high-yielding short-statured spring wheats (Triticum aestivum L.) ‘Anza’ and ‘Bluebird-2’ were space-planted in two blocks in a field planting. From each F₃ family, two to five of the best appearing plants from one block and five random plants in the second block were selected to study four selection strategies. Grain yields of the F₃ plants were obtained and 36 random families, each having three random and two visually selected lines, were studied in the F₄ in field trials at two locations using the commercial seeding rate. The F₃ selection strategies and F₄ yield results, given as percentages over the random F₄ mean yield for the random and visually selected progenies, respectively, were as follows: (1) individual selection, 0.33 selection intensity, 4.21 and 4.73%; (2) within family selection, best plant in each family selected, 2.43 and 2.87%; (3) family selection, 0.33 selection intensity, 1.01 and 5.52%; and (4) combined family and within family selection, 0.33 selection intensity for families with the best plant selected within families, 3.56 and 7.57%. Three-stage selection using (1) visual selection of plants, (2) selection of families on the basis of the mean of yields of visually selected plants, and (3) selection of best plants within selected families appears to be an effective and easily applied strategy worthy of further evaluation.

Key Words: Triticum aestivum L. • Selection response • Visual selection • Breeding methods

² Former graduate student (present address: International Institute of Tropical Agriculture, P.M.B. 5320, Ibadan, Nigeria) and professor of agronomy.

Received for publication March 21, 1977.