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Comparison of Two Breeding Strategies by Computer Simulation

Jiankang Wang*,a, Maarten van Ginkela, Dean Podlichb, Guoyou Yec, Richard Trethowana, Wolfgang Pfeiffera, Ian H. DeLacyc, Mark Cooperb and Sanjaya Rajarama

a Wheat Program, CIMMYT, Apdo. Postal 6-641, 06600 Mexico, D.F., Mexico
b Pioneer Hi-Bred International Inc., 7300 N.W. 62nd Avenue, PO Box 1004, Johnston, IA 50131, USA
c School of Land and Food Sciences, The University of Queensland, Brisbane, Qld 4072, Australia



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  		Fig. 1. Germplasm flow for single crosses made in Toluca and targeted to ME1 (low rainfall and irrigated environment for spring wheat). MODPED, modified pedigree/bulk selection method. SELBLK, selected bulk selection method.

 


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  		Fig. 2. Results from the simulation experiment. (a) Adjusted genetic gain after one breeding cycle across all experimental sets. (b) Number of crosses after each generation's selection across all experimental sets. (c) Number of families in each generation in one breeding cycle. (d) Number of individual plants in each generation in one breeding cycle. F8(T), F8 field test at Toluca; F8(B), F8 field test at El Batan; F8(YT), F8 yield trial at Cd. Obregon; F8(SP), F8 small plot evaluation at Cd. Obregon; F9(T), F9 field test at Toluca; F9(B), F9 field test at El Batan; F9(YT), F9 yield trial at Cd. Obregon; F9(SP), F9 small plot evaluation at Cd. Obregon; F10(YR), F10 stripe rust screening at Toluca; F10(LR), F10 leaf rust screening at El Batan.

 




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