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This article in CS

  1. Vol. 24 No. 2, p. 320-322
    Received: Apr 14, 1983

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Heritability of Trichome Density and Droplet Size in Interspecific Potato Hybrids and Relationship to Aphid Resistance1

  1. Shawn A. Mehlenbacher,
  2. Robert L. Plaisted and
  3. Ward M. Tingey2



The heritability of three glandular trichome traits and their relationship with resistance to the green peach aphid (Myzus persicae Sulzer) was investigated in a population of Solanum tuberosumS. berthaultii hybrids. Droplet size of type B trichomes was highly heritable (64 ± 8%). Density of type B trichomes was intermediate in heritability (22 ± 5%). Density of type A trichomes was variable both within and among leaves of the same clone. A low heritability estimate (18 + 3%) was obtained when seedling counts were used as parental values, but a higher estimate (32 ± 7%) was obtained when multiple counts on field-grown plants were used. None of the three traits taken singly was significantly correlated with suppression of Myzus persicae populations in field trials, although F2 and F3 hybrids with high levels of aphid resistance were recovered. The resistance of Solanum berthaultii Hawkes appears to be due to a complex interaction of chemical and physical factors, and should be handled by potato breeders as a quantitatively inherited trait.

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