Identification of midgut membrane proteins from different instars of Helicoverpa armigera (Lepidoptera: Noctuidae) that bind to Cry1Ac toxin
IHS Da Silva, I Gomez, J Sanchez… - PLoS …, 2018 - journals.plos.org
Helicoverpa armigera is a polyphagous pest sensitive to Cry1Ac protein from Bacillus
thuringiensis (Bt). The susceptibility of the different larval instars of H. armigera to Cry1Ac
protoxin showed a significant 45-fold reduction in late instars compared to early instars. A
possible hypothesis is that gut surface proteins that bind to Cry1Ac differ in both instars,
although higher Cry toxin degradation in late instars could also explain the observed
differences in susceptibility. Here we compared the Cry1Ac-binding proteins from second …
thuringiensis (Bt). The susceptibility of the different larval instars of H. armigera to Cry1Ac
protoxin showed a significant 45-fold reduction in late instars compared to early instars. A
possible hypothesis is that gut surface proteins that bind to Cry1Ac differ in both instars,
although higher Cry toxin degradation in late instars could also explain the observed
differences in susceptibility. Here we compared the Cry1Ac-binding proteins from second …
Identification of midgut membrane proteins from different instars of Helicoverpa armigera that bind to Cry1Ac toxin.
Helicoverpa armigera (Lepidoptera: Noctuidae) is a polyphagous pest that feeds on
important crops worldwide. This pest is controlled mainly by chemical insecticides, but also
by Cry1Ac toxin produced by Bacillus thuringiensis (Bt). However, it was shown that larvae
from late instars are less sensitive to Cry toxin action compared with early instars, reducing
the efficacy of Cry toxins in the field. The most common mechanism of insect resistance to
Cry toxins is linked to a reduced toxin binding to midgut brush border membranes (BBM) …
important crops worldwide. This pest is controlled mainly by chemical insecticides, but also
by Cry1Ac toxin produced by Bacillus thuringiensis (Bt). However, it was shown that larvae
from late instars are less sensitive to Cry toxin action compared with early instars, reducing
the efficacy of Cry toxins in the field. The most common mechanism of insect resistance to
Cry toxins is linked to a reduced toxin binding to midgut brush border membranes (BBM) …
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