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- W3150374471 abstract "In an effort to develop a chemically inducible system for insect management, we studied production of Cry1Ab Bacillus thuringiensis (Bt) protein and control of the diamondback moth (DBM), Plutella xylostella L., in inducer-treated and untreated tissues of a broccoli line transformed with a PR-1a/cry1Ab expression cassette. Spraying leaves of these plants with the inducer acibenzolar-S-methyl (= 1,2,3 benzothiadiazole-7thiocarboxylic acid-S-methyl-ester) (ASM) triggered expression of the cry1Ab gene and produced a high level of Cry1Ab protein within 2–3 days. Cry1Ab protein persisted in leaves for at least 8 weeks, providing prolonged protection from P. xylostella attack. Signals generated in inducer-treated leaves were transferred to untreated newly emerged leaves or heads, as seen by production of Cry1Ab protein and/or protection from insect damage in these plant parts. Signal transduction proceeded in an attenuated manner up to the sixth newly emerged leaf. No Cry1Ab protein was detectable by ELISA in uninduced young leaves, but small amounts of the protein were present in uninduced leaves older than 3 weeks and caused some insect mortality. Such basal expression of Bt genes without induction may favor the evolution of resistant insect populations and therefore limits the application of the PR-1a/cry1Ab system for insect management. However, the rapid production Communicated by S. Gleddie J. Cao · E. D. Earle ( ) Department of Plant Breeding and Genetics, Cornell University, Ithaca, NY 14853, USA e-mail: ede3@cornell.edu Tel.: +1-607-255-3102 Fax: +1-607-255-6683 S. L. Bates · J.-Z. Zhao · A. M. Shelton Department of Entomology, Cornell University/NYSAES, Geneva, NY 14456, USA Present address: S. L. Bates BIOCAP Canada Foundation, Queen’s University, Kingston, ON K7L 3N6 Canada and steady maintenance of a high level of transgenic protein upon induction, the signal transduction observed, and the fact that the chemical inducer can be used in field conditions make the PR-1a promoter attractive for chemical regulation of other agriculturally or pharmaceutically important genes for which low expression in the absence of induction is not a concern." @default.
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- W3150374471 date "2006-01-01" @default.
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- W3150374471 title "GENETIC TRANSFORMATION AND HYBRIDIZATION" @default.
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