Breeding methodologies and genetic basis of resistance in maize to the European corn borer.
1989
Guthrie W.D. | Russell W.A.
Resistance in maize, Zea mays L., to leaf feeding by first-generation European corn borers, Ostrinia nubilalis Hubner, is conditioned by at least eight genes. Resistance to sheath-collar feeding by second-generation European corn borers is conditioned by at least seven genes. Reciprocal translocation studies showed that at least 12 of the possible 20 chromosome arms, contributing a minimum of 12 genes, are involved in resistance; only 2 or 3 of the 12 chromosome arms are in common for genes resistant to the two European corn borer generations. Thus, resistance to the European corn borer is conditioned by two different mechanisms. This number of genes rules out the possibility of using a backcross procedure to transfer resistance to susceptible maize genotypes. A recurrent-selection breeding technique was used to develop genotypes of maize resistant to leaf feeding by first-generation European corn borers, resistant to sheath-collar feeding by second-generation European corn borers, and resistant to both generations of borers.
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