title: Effect of day length and light intensity on 2-tridecanone levels and resistance inLycopersicon hirsutum f.glabratum toManduca sexta.
abstract: First instarManduca sexta (L.) larvae confined on foliage fromLycopersicon hirsutum f.glabratum (accession PI 134417) plants grown under a long-day regime exhibited greater mortality than larvae on foliage from plants grown under a short-day regime. 2-Tridecanone, a toxin important in the insect resistance of PI 134417, was significantly more abundant in the foliage of plants grown under the long-than the short-day regimes. Light intensity influenced neither 2-tridecanone levels nor the expression of resistance. The density of glandular trichomes, which secrete 2-tridecanone, was influenced by an interaction between day length and light intensity.
authors.affiliation: Department of Entomology, North Carolina State University, 27650, Raleigh, North Carolina.
authors.forename: G G
authors.initials: GG
authors.lastname: Kennedy
authors.forename: R T
authors.initials: RT
authors.lastname: Yamamoto
authors.forename: M B
authors.initials: MB
authors.lastname: Dimock
authors.forename: W G
authors.initials: WG
authors.lastname: Williams
authors.forename: J
authors.initials: J
authors.lastname: Bordner