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Broad‐Spectrum Arthropod Resistance in Hybrids between High‐ and Low‐Acylsugar Tomato Lines
Author(s) -
Maluf Wilson Roberto,
Maciel Gabriel Mascarenhas,
Gomes Luiz Antonio Augusto,
Cardoso Maria das Graças,
Gonçalves Luciano Donizete,
Silva Ernani Clarete,
Knapp Markus
Publication year - 2010
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci2009.01.0045
Subject(s) - biology , hybrid , tetranychus urticae , pest analysis , horticulture , tuta absoluta , lycopersicon , solanum , spider mite , introgression , botany , gelechiidae , biochemistry , gene
Three elite tomato ( Solanum lycopersicum L., syn. Lycopersicon esculentum Mill.) breeding lines (TOM‐687, TOM‐688, TOM‐689) with high foliar acylsugar (AS) contents were obtained, and used along with two low‐AS lines (TOM‐690, TOM‐684) in hybrid combinations, to obtain six hybrids between one low‐AS line × one high‐AS line (= hybrids with intermediate AS levels), one hybrid between two high‐AS lines (= high‐AS hybrid), and one hybrid between two low‐AS lines (= low‐AS hybrid). These genotypes were tested for resistance to three different tomato pests (spider mites [ Tetranychus urticae Koch], silverleaf whitefly [ Bemisia argentifolii Bellows & Perring], and the South American tomato pinworm [ Tuta absoluta (Meyrick)]) along with hybrid TEX‐154 (low‐AS) and/or Solanum pennellii Correll ‘LA‐716’ (high‐AS wild accession). In all three instances, high‐AS genotypes showed higher levels of pest resistance than low‐AS genotypes. Hybrids with intermediate AS levels showed resistances that were just as high as those of high‐AS genotypes for Bemisia argentifolii and Tuta absoluta , and nearly as good as those for Tetranychus urticae . Acylsugars were confirmed as being a major component of the high levels of pest resistances found in S. pennellii —a component that was successfully introgressed into elite tomato breeding lines. Acylsugar‐mediated pest resistance is effective against a broad spectrum of tomato pests. Because high‐AS breeding lines are scarce, the deployment of hybrids between high‐AS line × low‐AS line would be a quick, viable alternative to obtain commercial pest‐resistant hybrids.