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Six cotton lines were evaluated for resistance to tobacco budwonn, Heliothis virescens (F.), in two glasshouse experiments. The cotton lines were four transgenic somaclones carrying the 8-endotoxin gene (Bt) from Bacillus thuringiensis variety kurstaki and a marker gene (NPTII), and two control lines without the Bt gene (one transgenic control carrying only the NPTII gene, an antibiotic resistance marker gene, and one nontransgenic control). In a behavior experiment, the lines were evaluated for their influence on feeding, resting, locomotion, and spin-down (i.e., leaving the plant on a silken thread) behaviors of third-ins tar H. virescens. The percentage of time larvae were observed in spin-down behavior was significantly greater on one somaclone carrying the Bt gene than for the nontransgenic 'Coker 312' control. No significant differences were observed in percentage of time larvae spent feeding or resting, or in the occurrence of larvae on flower bud, leaf, or stem-petiole on the six lines. However, more larvae were found in the terminals of one somaclone carrying the Bt!NPTU genes than for the 'Coker 312' control. In a second experiment, neonates were confined on the six cotton lines for 10 d to compare larval growth, survival, and plant injury. Larval weight (fresh) and injury to small bolls were reduced on one somaclone carrying the Bt gene compared with the non transgenic control. However, flower bud injury was not different among the six lines. These data suggest that the transgenic Bt lines were not expressing the 8-endotoxin at levels sufficient to have a relatively large influence on larval behavior, growth, survival, or plant damag.
Document Type: Research Article
Publication date: April 1, 1992
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.