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Inheritance of sesquiterpene carboxylic acid synthesis in crosses of Lycopersicon hirsutum with insect‐susceptible tomatoes
Author(s) -
Frelichowski J. E.,
Juvik J. A.
Publication year - 2005
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.2005.01076.x
Subject(s) - biology , backcrossing , lycopersicon , helicoverpa zea , introgression , botany , cultivar , hybrid , exigua , heritability , horticulture , lepidoptera genitalia , noctuidae , spodoptera , genetics , gene , recombinant dna
Sesquiterpene carboxylic acids (SCA) from Lycopersicon hirsutum f. typicum Humb, & Bonpl, accession LA 1777 confer host‐plant resistance to Helicoverpa zea (Boddie) and Spodoptera exigua (Hübner), two Lepidopteran (Noctuidae) insect pests of the cultivated tomato. L. esculcntum Mill. Hybrids were made between LA 1777 and two accessions of insect‐susceptible tomatoes that do not produce SCA, L. hirsutum LA 1033 and the L. L. esculentum cultivar Chico III, F 2 and backcross progeny of both crosses were evaluated for variation in amounts of total SCA in replicated field and greenhouse plantings. Analysis of variance of total SCA in a set of F 2 plants of the cross LA 1033 × LA 1777 demonstrated significant variation in SCA attributable to genotype, environment and their interaction. Segregation for high levels of SCA in the populations suggests polygenic inheritance. Broad sense heritability was 0.84, which indicates that phenotypic selection for plants with high SCA is feasible in a backcross‐breeding programme for the introgression of SCA‐mediated insect resistance into tomato cultivars.