Alcantara said since the ACB could not penetrate Bt corn
grains 10 years after the variety had been approved for
commercialization, it is remote for the pest to suddenly
develop resistance to the unique protein used in shielding
the biotech corn from attack.
“ACB has simply not overcome the genetic armor of Bt corn,”
Alcantara delivered his lecture entitled “Monitoring Cry1ab
Susceptibility in ACB on Bt Corn in the Philippines” during
the Biotech Monthly Seminar in UPLB.
He said tests have shown that no field-evolved ACB had
been detected in Bt corn stands 10 years after the variety
had been commercialized in the Philippines.
In the study his team conducted, Alcantara said the baseline
susceptibility of several ACB populations to the protein
Cry1ab was first estimated.
From the baseline bioassay data, the team identified and
validated a diagnostic concentration to several populations
of ACB. Cry1ab is the protein that battles ACB and prevents
it from nibbling away at the corn.
Alcantara said the concentration is now being used to monitor
the development of ACB resistance in eight corn-producing
Monitoring ACB resistance to Cry1ab is constantly being
monitored as part of what he calls “responsible stewardship
of transgenic technology.” Biolife News Service
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