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Background  The potential biofuel plant  Jatropha curcas  L. is affected by larvae of  Archips micaceanus  (Walker), a moth of the family Tortricidae. The hybrid  Bacillus thuringiensis  ( Bt )  δ -endotoxin protein Cry1Ab/1Ac confers resistance to lepidopteran insects in transgenic rice.    Results  Here, we report the production of a marker-free transgenic line of  J. curcas  (L10) expressing Cry1Ab/1Ac using  Agrobacterium -mediated transformation and a chemically regulated, Cre/ loxP -mediated DNA recombination system. L10 carries a single copy of marker-free T-DNA that contains the  Cry1Ab/1Ac  gene under the control of a maize phosphoenolpyruvate carboxylase gene promoter ( P    Pepc    :Cry1Ab/1Ac:T    Nos   ). The  P    Pepc    :Cry1Ab/1Ac:T    Nos    gene was highly expressed in leaves of L10 plants. Insecticidal bioassays using leaf explants of L10 resulted in 80-100% mortality of larvae of  A. micaceanus  at 4 days after infestation.    Conclusion  The results demonstrate that the hybrid  Bt δ -endotoxin protein Cry1Ab/1Ac expressed in  Jatropha curcas  displays strong insecticidal activity to  A. micaceanus . The marker-free transgenic  J. curcas  line L10 can be used for breeding of insect resistance to  A. micaceanus .

biotechnology for biofuels

Production of marker-free transgenic Jatropha curcas expressing hybrid Bacillus thuringiensis δ-endotoxin Cry1Ab/1Ac for resistance to larvae of tortrix moth (Archips micaceanus)