| Pak. J. Bot., 41(4): 2061-2065, 2009. | Back to Contents | ||||
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Updated: 03-09-09 | ||||
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A NOVEL
DNA SEQUENCE OF BACILLUS THURINGIENSIS
d-ENDOTOXIN RECEPTOR IN
HELICOVERPA ARMIGERA
KAUSAR MALIK AND SHEIKH RIAZUDDIN
Abstract: The pesticidal bacterium Bacillus
thuringiensis has been the subject of intensive research.
Bacillus thuringiensis (Bt) crystal proteins are effective in
controlling agriculturally and biomedically harmful insects. However,
the mechanism of Bt protein pesticidal action is not well understood.
It is assumed that the pesticidal protein has affinity for specific
receptors in the midgut of the susceptible larvae and binds irreversibly
to create holes in the gut leading to eventual death of the target
larvae. The study is endeavored to characterization of Bt delta
endotoxin receptor in agronomically important pest, American bollworm (Helicoverpa
armigera). Presence of a novel Protein is reported in the extract of
the larval midgut membrane of Helicoverpa armigera as putative
receptor for Bt Cry1A delta-endotoxins. The gene sequence has
novelty because it has no significant homology to already existing
sequences of Bt receptor. National Center of Excellence in Molecular Biology, University of the Punjab 87-West Canal Bank Road, Thokar Niaz Baig Lahore-53700, Pakistan |
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