Species Distribution of Biochemical and Morphological Characters Associated with Small Pest Resistance in Pelargonium ×hortorum

in Journal of the American Society for Horticultural Science
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  • 1 Intercollege Graduate Degree Program in Genetics, The Pennsylvania State University, University Park, PA 16802
  • | 2 Schering-Plough, 2015 Galloping Hill Road, Kenilworth, N.J. 07233
  • | 3 Department of Entomology, The Pennsylvania State University, University Park, PA 16802
  • | 4 Department of Entomology, The Pennsylvania State University, University Park, PA 16802
  • | 5 Department of Biology, The Pennsylvania State University, University Park, PA 16802
  • | 6 Department of Horticulture, The Pennsylvania State University, University Park, PA 16802
  • | 7 Department of Entomology, The Pennsylvania State University, University Park, PA 16802

Biochemical and morphological components of 16 Pelargonium species and the P. ×hortorum interspecific complex were examined. Inflorescences and leaves of each species were analyzed for anacardic acids and the presence of glandular trichomes. Three species of the section Ciconium, P. acetosum, P. frutetorum, and P. inquinans, produced anacardic acids in association with glandular trichomes. only P. inquinans and P. frutetorum contained ω5- anacardic acids. An evolutionary model for the origin of anacardic acids and ω5- desaturation is proposed.

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