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Published in Crop Sci 8:251-254 (1968)
© 1968 Crop Science Society of America
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Genetics of Host Reaction to Corn Stunt Virus1

C. O. Grogan and E. E. Rosenkranz2

Progeny of combinations of one susceptible line (Mp420) with three resistant maize (Zea mays L.) lines (T204, GT11, and CI21) were tested for three gorwing seasons to determine the genetics of host reaction to the leafhopper-transmitted corn stunt virus. Dominance for resistance or susceptibility was lacking. The influence of heterosis favoring virus tolerance was apparent. Results indicated a relatively simple inheritance pattern. Studies of effects of genes indicated a strong additive influence, no dominance, and insignificant epistatic effects. A recurrent selection scheme would appear to be best for transferring resistance to susceptible material. If the plant breeder desires to transfer resistance to specific genotypes, a recurrent-backcross approach is proposed where resistant segregates would be recombined before the1 next backcross. The approach is suggested also for other traits controlled by few genes, including modifiers.

Key Words: maize • virus • genetics • host reaction • gene effects

1 Contribution from the Crops Research Division, Agricultural Research Service, U. S. Department of Agriculture, and the Mississippi Agricultural Experiment Station, State College, Miss. Published as Journal paper 1538 of the Mississippi Agricultural Experiment Station. Cornell University provided C. O. Grogan with travel funds to record the 1966 results, and W. J. Drapala of Mississippi State University gave statistical advice.

2 Formerly Agronomist, Crops Research Division, ARS, USDA, and Professor of Agronomy, (presently Professor of Plant Breeding, Cornell University, Ithaca, N.Y.); and Plant Pathologist, Crops Research Division, ARS, USDA, and Assistant Professor of Plant Pathology, Mississippi State University, State College, Miss.

Received for publication September 11, 1968.




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