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Published in Crop Sci 11:703-706 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effectiveness of Selection in Successive Generations of Maize Inbred Progenies for Improvement of Hybrid Yield1

M. A. El-Lakany and W. A. Russell2

The F1, F2, F3, and F4 generations of 20 selected maize (Zea mays L.) inbred families were evaluated by testcross performance to determine the efficacy of selection in three successive segregating generations to improve combining ability for yield. Ten lines had high yield performance and 10 lines had low yield performance as determined by testcrosses of the F5 or F6 generation. The high-performance families had F2's equal to, or better than, their F1 source, and nine families were improved by selection in the F3 or F4, or both. Five low-performance families had F2 yields below those of the f1 source, and not enough gain by selection was realized to have the F4 at the yield level of the F1. The other five low-performance families had F2 yields at least equal to their F1 source, but no further gains in yield were obtained by selection.

Key Words: Zea mays L. • Breeding methods

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture and the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa 50010, as Journal Paper No. J-6851. Project No. 1575. (Part of thesis presented by the senior author to the Iowa State University in partial fulfillment of the requirements for the Ph.D, degree.)

2 Former Graduate Student, Alexandria, Egypt, U.A.R. and Professor, respectively, Iowa State University, Ames, Iowa.

Received for publication March 11, 1971.


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E. A. Lee and M. Tollenaar
Physiological Basis of Successful Breeding Strategies for Maize Grain Yield
Crop Sci., December 18, 2007; 47(Supplement_3): S-202 - S-215.
[Abstract] [Full Text] [PDF]


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