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Published in Crop Sci 24:320-322 (1984)
© 1984 Crop Science Society of America
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Heritability of Trichome Density and Droplet Size in Interspecific Potato Hybrids and Relationship to Aphid Resistance1

Shawn A. Mehlenbacher, Robert L. Plaisted and 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 tuberosum x S. 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.

Key Words: Solanum tuberosum • Solanum berthaultii • Glandular trichomes • Insect resistance

1 Paper no. 724, Dep. of Plant Breeding and Biometry, Cornell Univ.,-Ithaca, NY 14-853. This research was supported by the USDA-ARS under grant no. 7800454 from the Competitive Research Grants Office, and the Int. Potato Ctr., Lima, Peru.

2 Former graduate research assistant and professor, Dep. of Plant Breeding and Biometry, and associate professor, Dep. of Entomology, respectively, Cornell Univ., Ithaca, NY 14853. Present address of senior author: Dep. of Horticulture. and Forestry, Cook College, Rutgers Univ., New Brunswack, NJ 08903.

Received for publication April 14, 1983.




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