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A Second Major Gene Locus in Corn for Chlorotic-Lesion Resistance to Helminthosporium turicum¹

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.

Key Words: Zea mays L. • Northern leaf blight • Gene Ht • Gene Ht2

² Professor of plant pathology and plant genetics, Deps. of Plant Pathology and Agronomy, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801.

Received for publication July 24, 1976.