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Temporal variation in expression oftoxicity in transgenic cottons against bollworm, Helicoverpa armigera (Lepidoptera:Noctuidae)

Indian Agricultural Research Journals

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Title Temporal variation in expression oftoxicity in transgenic cottons against bollworm, Helicoverpa armigera (Lepidoptera:Noctuidae)
 
Creator SRlNIVASAN, R
UTHAMASAMY, S
 
Subject Transgenic cotton; Toxicity; Temporal variation; Helicoverpa armigera
 
Description Whole leaf bioassays were conducted during 2002-03 with neonates of Helicoverpa armigera to study the variation in expression oftoxicity with 3 transgenic lines, Mech 162 Bt and Mech 184 Bt at TNAU, Coimbatore. The bioassay of plants was done at fortnightly intervals in growing phase when plants had commenced squaring,and the third leaf from top on main shoot of the plant was used. Data on the toxicity showed a consistent decline in the efficacy of transgenic cotton plants, high efficacy in early flowering stage and a subsequent decline from 90 to 100 days, synchronizing with early boll formation stage. Decline in larval mortality ranged from 10 to 15% 90 days after sowing. The results of growth inhibition bioassay revealed than mean weight of survivors of H. armigera larvae on Bt leaves and bolls incorporated
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2011-01-04
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2502
 
Source The Indian Journal of Agricultural Sciences; Vol 76, No 2 (2006)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2502/636
 
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