Glandular Trichomes of Solanum neocardenasii Confer Resistance to Green Peach Aphid (Homoptera: Aphididae)

Publisher Website
Google Scholar
Abstract
Botanical seed of a newly described wild potato species, Solanum neocardenasii Hawkes & Hjerting, was collected in central Bolivia. Foliage of S. neocardenasii bears type A and type B glandular trichomes that entrap aphids in a manner similar to that of the highly aphid-resistant species, S. berthaultii Hawkes. Initiation of probing by the green peach aphid, Myzus persicae (Sulzer), on S. neocardenasii was delayed compared with that on S. tuberosum. Feeding rates on the two species were comparable once probing was initiated. Reduced aphid survivorship on S. neocardenasii compared with a susceptible S. tuberosum cultivar was associated with presence of extremely large droplets of adhesive type B exudate. Trichome exudate of S. neocardenasii darkened and hardened on aphid tarsi, labia, and antennae in a manner visually similar to S. berthaultii exudate. These findings indicate that S. neocardenasii is an additional source of trichome-based resistance to green peach aphid and may be of value to potato breeding programs attempting to expand the genetic base of host plant resistance to insects.

This publication has 1 reference indexed in Scilit: