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Published in Crop Sci 22:10-12 (1982)
© 1982 Crop Science Society of America
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Evaluation of Three Cycles of Full-Sib Family Selection for Yield in the Colus o2 Variety of Maize1

Hugo L. Zorrilla and P. L. Crane2

The main objective of this study was to evaluate three cycles of full-sib family selection in the ‘Colus o2’ variety of maize (Zea mays L.). Selection was directed primarily for yield among fullsib families and simultaneously within full-sib families for more vitreous kernels with good lysine levels and free of kernel rots.

Families were compared with a check hybrid in each selection trial. The cycles and topcrosses of each cycle by two homozygous opaque-2 testers grown at three locations in 1978 provided measures of the gain due to three cycles of selection. Regression analysis showed that during three cycles of full-sib family selection, grain yield increased 2.86 q/ha or 5.46% per cycle. Average gain of the two top-crosses was 2.63 q/ha or 4.1% per cycle, relative to the non-improved variety.

Key Words: Zea mays L. • Corn breeding • Protein quality • Lysine

1 Journal Paper No. 8072. Contribution from the Dep. of Agronomy, Purdue Univ. Agric. Exp. Stn., Lafayette, IN 47907. Part of a thesis submitted by the senior author in partial fulfillment of the requirements for the Ph.D, degree. Supported in part by the Agency for International Development through the project "Inheritance and Improvement of Protein Quality and Content in Maize" (AID/ta-C-1211).

2 Former graduate student, now corn breeder with Funk Seeds International in Mexico and professor of agronomy, Purdue Univ., Lafayette, IN 47907.

Received for publication September 11, 1980.




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