Effects of Bt-maize material on the life cycle of the land snail Cantareus aspersus

摘要: Insect resistant Bt-maize (MON 810) expresses active Cry1Ab endotoxin derived from Bacillus thuringiensis (Bt). Snails constitute non-target soil species potentially exposed to Bt-toxin through consumption of plant material and in fields where transgenic plants have been grown. We studied the effect CrylAb toxin on survival, growth egg hatchability snail Cantareus aspersus. From age 4-88 weeks, snails were fed either powdered or non-Bt-maize samples collected after harvesting non-Bt-maize. applied four treatments: non-Bt + (MM); Bt (BB), (MB), ( BM ). Eggs laid by not also two types soils (Bt soil). At end (47 weeks exposure), food (BB) had a coefficient (GC) 25% lower than unexposed (MM). After first period reproduction (68 weeks) significant difference remained for body mass GC between BB MM treatments. Differences at exposure (88 weeks). For previously material, eggs was similar tested. The outcome experiments indicates that, growing snails, long-term is needed reveal an Bt-maize. hazard analysis which we performed, based worst-case scenario, i.e. having no choice, should now be complemented other simple measurements, e.g. intake, understand underlying mechanisms involved.