Journal
EUPHYTICA
Volume 127, Issue 2, Pages 275-287Publisher
KLUWER ACADEMIC PUBL
DOI: 10.1023/A:1020239512598
Keywords
Bemisia argentifolii; glandular trichomes; indirect selection; insect resistance; interspecific cross; Lycopersicon esculentum; Lycopersicon hirsutum var. hirsutum; sesquiterpene; whitefly; zingiberene
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The sesquiterpene zingiberene, present in leaf glandular trichomes, is reportedly responsible for the high level of arthropod resistance found in Lycopersicon hirsutum var. hirsutum. This paper reports on the inheritance of zingiberene contents and of the various types of glandular trichomes in the interspecific cross L. esculentum x Lycopersicon hirsutum var. hirsutum. Plants of L. esculentum 'TOM-556' (= P-1), L. hirsutum var. hirsutum 'PI-127826' (= P-2), F-1 (P-1 x P-2) and F-2 (P-1 x P-2) were evaluated for zingiberene contents and densitities of and glandular (types I, IV, VI and VII) trichomes. Broad sense heritabilities were high for all traits studied (0.678, 0.831, 0.996, 0.799 and 0.717 respectively for zingiberene and trichome types I, IV, VI, VII). There were significant positive genetic correlations between zingiberene contents and densities of trichomes types IV, VI and VII. Inheritance of zingiberene contents can be explained mostly by the action of a single major locus, in which the allele from L. hirsutum that conditions high content is incompletely recessive over the allele from L. esculentum. Action of an incompleteley recessive allele in one major locus appears to be evident for densities of trichome types IV, VI and VII, but there is also evidence of the action of other epistatic loci for types IV and VI. F-2 genotypes selected for high zingiberene levels showed higher levels of resistance to the silverleaf whitefly Bemisia argentifolii than L. esculentum 'TOM-556', levels that were comparable those found in L. hirsutum var. hirsutum 'PI-127826' and other whitefly resistant accessions.
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