Gene Ht2 that conditions a form of chlorotic‐lesion resistance to Helminthosporium turcicum Pass, was identified in the Australian dent corn (Zea mays L.) inbred NN14. Inbred NN14 also carries a second gene at the Ht locus. The two genes are not linked. Gene Ht2 conditions a lower level of resistance than does Ht but the two genes interact together to condition a higher level of resistance than either gene alone.
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Arthur L. Hooker (1977) studied this question.