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Evaluation of Eight Inbred Lines of Maize (Zea mays L.)¹

The general combining ability of eight maize inbred lines was determinedb y meanso f testcrosses with an openpollinated variety and two single crosses. The inbred lines also were grown to observe their usefulness in predicting the perfor~nance of hybrid combinations. Twenty eight possible single crosses amongth e eight inbred lines, excluding the reciprocals, were grown to predict the performance of double crosses. Of the possible 210 double crosses, 28 were randomlys elected and grownt o compare their performance with that predicted from the single crosses by Jenkins' method (b).

The lines were rated similarly by the three testers for mosta gronomictr aits studied. Anyo ne of the three testers could be used for evaluating the lines for general combining ability. The correlations between the testcrosses and the inbred lines were low for grain yield and shelling percentage but they were of sufficiently high magnitude for maturity characters, plant and ear height, and ear length to have predictive value in hybrid development. Positive significant correlations were obtained between the observed performance of double crosses and that predicted from single crosses by Jenkins' method (b) for all characters studied.

² Former Graduate Assistant, Departnlent of Agronomy, University of Wisconsin; presently Corn Breeder and Research Geneticist, Edw. J. Fnnk & Sons, Inc., Kentland, Indiana. Acknowledgment is made to Dr. J. H. Torrie for suggestions and criticisln and to National Science Foundation and Wisconsin Alumui Research Fountlation for rise of the facilities with Numerical Analysis Laboratory.

Received for publication August 27, 1965.