Abstract
The greenhouse whitefly Trialeurodes vaporariorum is a major threat in tomato cultivation. In greenhouse grown tomatoes non-trichome based whitefly resistance may be better suited than glandular trichome based resistance as glandular trichomes may interfere with biocontrol, which is widely used. Analysis of a collection of recombinant inbred lines derived from a cross between Solanum lycopersicum and Solanum galapagense showed resistance to the whitefly T. vaporariorum on plants without glandular trichomes type IV. The resistance affected whitefly adult survival (AS), but not oviposition rate. This indicates that S. galapagense, in addition to trichome based resistance, also carries non-trichome based resistance components. The effectiveness of the non-trichome based resistance appeared to depend on the season in which the plants were grown. The resistance also had a small but significant effect on the whitefly Bemisia tabaci, but not on the thrips Frankliniella occidentalis. A segregating F2 population was created to map the non-trichome based resistance. Two Quantitative trait loci (QTLs) for reduced AS of T. vaporariorum were mapped on chromosomes 12 and 7 (explaining 13.9% and 6.0% of the variance respectively). The QTL on chromosome 12 was validated in F3 lines.
Highlights
Cultivated tomato, Solanum lycopersicum L., is a crop grown under both open field and greenhouse conditions
The T. vaporariorum resistance phenotyping reported by Vosman et al (2019) indicated that three recombinant inbred lines (RILs) lines (R015, R086 and R169), on which trichomes type IV were absent, showed a reduced whitefly adult survival
Resistance independent of trichomes type IV is present in S. galapagense and affects adult survival
Summary
Cultivated tomato, Solanum lycopersicum L., is a crop grown under both open field and greenhouse conditions. It is the leading non-grain commodity in the global production system, with 182 million tons produced in 2018 (FAO 2018). Two whitefly species cause major problems in cultivated tomato: the greenhouse whitefly (Trialeurodes vaporariorum) and the silverleaf whitefly (Bemisia tabaci). They damage the plants by feeding on the phloem, inducing wilting and reducing growth, both in the nymph and adult stages (Johnson et al 1992). Sooty moulds reduce the photosynthetic capacity of plants by blocking sunlight (Chomnunti et al 2014).
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
