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Grain Yield of Two Synthetics of Corn after Seven Cycles of Selection for Lodging Resistance¹

Two synthetics of corn (Zea mays L.), that had undergone seven cycles of recurrent selection for lodging resistance, were evaluated for grain yield in crosses with two relatively unrelated testers. The combined regression of grain yield on selection cycles indicated a yield reduction of 0.34 q/ha per cycle in tester crosses or a reduction of 4%. The individual regressions for each synthetic averaged over both testers indicated a reduction of 0.38 for Syn 8 and 0.31 q/ha per cycle for Syn 9. Although there were significant yield reductions resulting from selections for lodging resistance, the reductions did not appear unduly detrimental because the reductions were minimized in hybrid combination with unrelated testers. The improvement attained for lodging resistance in these synthetics should not seriously limit future progress in breeding for increased grain yield.

Key Words: Stalk quality • Stalk lodging • Root lodging • Erect plants • Recurrent selection

² Research agronomist, USDA-ARS, Raleigh, N.C. 27650. Paper No. 8190 of the Journal Series of the North Carolina Agric. Res. Serv., Raleigh, N.C. 27650.

Received for publication March 5, 1982.