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Diallel Analysis of Maize Inbreds for Resistance to Gray Leaf Spot

Agric. Products Dep. of DuPont Co., Crop Res. Lab., Newark, DE 19714

J. A. Hawk^* and R. B. Carroll

Delaware Agric. Exp. Stn., Dep. of Plant Science, College of Agric. Sciences Univ. of Delaware, Newark, DE 19717-1303

^* Corresponding author.

Gray leaf spot (GLS) (caused Cercospora zea e-maydis Tehon & Daniels) is becoming an increasingly prevalent disease of maize (Zea mays L.) in the USA. This study was conducted to determine the inheritance of GLS resistance. Nine inbreds and their 36 singlecross hybrids were evaluated for resistance in field studies conducted in 1987 and 1988. Plants were rated for disease development on a plot basis using a scale of 0.5 (resistant) to 5.0 (susceptible). weighted entry means for each year were analyzed using Gardner and Eberhart's diallel Analysis III for fixed effects. Highly significant (P < 0.01) genotypic and general combining ability (GCA) differences were seen for resistance; the specific combining ability (SCA) mean square was not significant. Inbreds T222 and Mo18W had significant negative (P < 0.01) GCA effects of –0.81 and – 0.76, respectively, and were significantly more resistant in crosses than the other inbreds. The mean rating of crosses involving CI64 (GCA = -–0.28, P < 0.05) was lower than the mean of crosses involving the three susceptible inbreds Mol7Ht, DE811, and B73Ht (which had positive GCA effects of 0.26 [P < 0.05], 0.47, and 1.08 [P < 0.01], respectively). As an inbred and in crosses, B73Ht was more susceptible than any other inbred evaluated, rating 3.1 in crosses compared with 1.6 for both T222 and MoI8W. The high level of resistance in inbreds T222 and Mo18W may be bred into elite, but GLS-susceptible, lines using backcross or recurrent selection procedures that utilize additive effects.

Received for publication September 28, 1989.

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