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Performance of Exotic x Temperate Single-Cross Maize Hybrids

DEKALB Genetics Corp., 423 S. Colebrook Road, Manheim, PA 17545
DEKALB Genetics Corp., 3100 Sycamore Road, Dekalb, IL 61005

^* Corresponding author.

Maize (Zea mays L.) hybrids were produced by crossing exotic and temperate inbred fines. A total of 12 exotic lines, four from each of three exotic groups (Argentine flint, ETO, and Tuxpeno), were crossed with 16 temperate inbred lines, four from each of four temperate inbred groups (B37, B73, OH43, and MO17). The hybrids were evaluated in 1992 at Leesburg, GA, and Oglethorpe, GA. This study was conducted to identify superior combinations of temperate and exotic heterotic groups. Generally, hybrids with either B73-derived or Tuxpeno lines had high yield, high grain moisture, high root lodging, and moderate stalk lodging. The B73 x Tuxpeno hybrids had the highest mean yield. Yield of B73 x exotic hybrids was not significantly different from the mean of the checks, whereas the remaining exotic-temperate combinations had yield significantly less than the checks. Argentine flint lines combined well with B37 and B73 lines, whereas ETO lines produced high yield when crossed with B73 and OH43 lines. Overall, Tuxpeno lines demonstrated higher combining ability with temperate lines than did the Argentine flint or ETO derived lines. Results from this study suggest considerable potential for exploiting exotic germplasm to improve temperate material, especially the MO17 and OH43 derived lines.

Received for publication May 31, 1994.

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