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  1. Vol. 10 No. 4, p. 352-354
     
    Received: Nov 10, 1969
    Published: July, 1970


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doi:10.2135/cropsci1970.0011183X001000040010x

Gene Dosage Effects on Monogenic Resistance to Northern Corn Leaf Blight1

  1. G.M. Dunn and
  2. Ted Namm2

Abstract

Abstract

The Ht gene conditions chlorotic lesion resistance in maize (Zea mays L.) to northern corn leaf blight incited by Helminthosporium turcicum Pass.

Monoploid, diploid, triploid, and tetraploid seedlings of Zea mays were obtained for the Ht and ht alleles and inoculated at the 3- or 4-leaf stage in a humid chamber at 19 to 21 C. Disease reaction was evaluated by determining the percentage of leaf area infected.

There was no difference in resistance between monoploid (Ht) and diploid (Ht Ht) or between triploid (Ht Ht Ht) and tetraploid (Ht Ht Ht Ht) seedlings; however, three and four doses of the Ht allele conferred a higher level of resistance on seedlings than did one or two doses. Heterozygous diploid (Ht ht) seedlings were always less resistant than any of the other levels of Ht used in this study.

Diploid, triploid, and tetraploid seedlings containing two, three, and four doses, respectively, of the ht allele did not differ in their degree of susceptibility. Monoploid (ht) seedlings were much more susceptible than seedlings of the other three dosage levels.

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