Abstract

The inheritance of host to stunt maize was studied

under natural field conditions. Inbred lines P1 (moderately

resistant) and P2 (susceptible) and their F1, F2, [BC(P1) and

BC(P2)] progenies were evaluated at two seasons at sea level,

in Veracruz in 1999. Significant epistatic effects were noted

to the resistance to stunt corn; however, the dominant

genetics effects were greater and more important than

additive and epistatic effects. The data showed that resistance

to stunt corn was controlled by only a few major genes. The

F1 hybrid showed high tolerance, indicating dominance and

mid-parent heterosis for resistance was also observed. The

data indicate that a back-crossing procedure can be used to

transfer the resistance factors into elite lines. Some form of

recurrent selection in populations having a degree of

resistance also is suggested.