RESUMO.Este trabalho foi desenvolvido com o objetivo de entender o envolvimento dos tricomas glandulares tipo IV, contendo acilaçúcares, na resistência de tomateiro à Bemisia argentifolii. Os genótipos utilizados foram: Lycopersicon esculentum 'TOM-584', desprovido de acilaçúcares e de tricomas tipo IV; L. pennellii 'LA-716', rico em acilaçúcares e em tricomas tipo IV; bem como suas plantas F 2 : BPX-370#30 e BPX-370#79. O experimento foi instalado em delineamento inteiramente casualizado com quatro tratamentos (genótipos), três e seis repetições dos parentais e dos clones F 2 , respectivamente. As quantificações dos tricomas tipo IV foram feitas do lado abaxial dos folíolos, em 20 cortes paradérmicos/planta, distribuídos em cinco folíolos/planta e quatro cortes/folíolo. As informações sobre os teores de acilaçúcares, bem como dos números de adultos mortos e ninfas vivas de mosca branca dos genótipos em teste, foram obtidas de outros estudos. Foram realizados contrastes entre as médias dos genótipos F 2 , para a densidade de tricomas, número de adultos mortos e de ninfas vivas de mosca branca. Não houve influência do tricoma tipo IV na resistência do tomateiro à mosca branca. A presença de adultos mortos do inseto nas plantas com este tipo de tricoma, bem como a ausência ou pequena quantidade de ninfas vivas, são explicadas pela ação dos acilaçúcares carreados por esse tipo de tricoma.Palavras-chave: Lycopersicon spp., Bemisia argentifolii, aleloquímicos, seleção indireta.ABSTRACT. Relationship between acylsugars, glandular trichome and resistance of tomato plants to the silverleaf whitefly. This work was carried out to understand the effect of glandular trichome type IV with acylsugars on the resistance to Bemisia argentifolii in tomato plants. The genotypes used were: Lycopersicon esculentum 'TOM-584', without acylsugars and type IV trichomes; L. pennellii 'LA-716', rich in acylsugars and type IV trichomes as well as its F 2 plants: BPX-370#30 and BPX-370#79. The experiment was established in a completely randomized design with four treatments (genotypes), three and six replications from the parents and F 2 plants, respectively. The trichome type IV quantification was made by using 20 paradermic cuts from the abaxial side of the leaflets; a sample of five leaflets per plant and four cuts per leaflet was used. A set data of acylsugars contents, number of dead adults and live whitefly nymphs, on the genotypes in test were obtained from other works. Contrasts were made between the medium of the trichome density of F 2 genotypes as well as the quantity of dead adults and live whitefly nymphs. It was not confirmed the influence of type IV trichomes on the quantity of dead adults and live nymphs. The respective presence and absence of dead adults and live whitefly nymphs, in tomato plants with type IV trichomes, is due to acylsugars contents in these trichomes.
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