Variation in Trichome-Based Resistance to Bemisia argentifolii (Homoptera: Aleyrodidae) Oviposition on Tomato
Authors: HEINZ, KEVIN M.; ZALOM, FRANK G.
Source: Journal of Economic Entomology, Volume 88, Number 5, October 1995 , pp. 1494-1502(9)
Publisher: Entomological Society of America
Abstract:Twenty commercial tomato cultivars and 7 wild relatives of tomato were screened in the laboratory for resistance to the silverleaf whitefly, Bemisia argentifolii Bellows &Perring. In addition, we examined morphological and genetic mechanisms associated with the whitefly and tomato plant that may explain observed variations in resistance patterns. Leaf trichome and position relative to the stem tenninus were the best predictors of whitefly oviposition rates on tomato cultivars and their wild relatives. Higher oviposition rates occurred on leaves with dense trichomes positioned close to the stem terminus. Leaf trichome density also explained a significant portion of the variance in whitefly oviposition rates among commercial cultivars. Cultivars with low trichome densities sustained less whitefly oviposition than did cultivars with high trichome densities. There was no relationship between leaf trichome densities and whitefly oviposition rates on wild tomatoes. High levels of resistance were observed on Lycopersicon hirsutum Humb. and Bonp!. and L. pennellii (Corr.) D'Arcy. The patterns of trichome-based resistance among the commercial cultivars were validated in field choice tests and greenhouse population studies. Six genetically distinct tomato lines were generated by introgression of a single L. pennellii chromosome into L. esculentum Miller. The genetic information that confers resistance in L. pennellii is spread across at least 5 different chromosomes, but a substantial portion likely resides on a single chromosome.
Document Type: Research Article
Publication date: 1995-10-01
- Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.
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