Abstract
Spider venoms are neurotoxin proteins that can kill insects. Spider toxin Hvt gene was cloned under two phloem specific RSs1 and RolC promoters, transformed into tobacco plants through Agrobacterium-mediated transformation and tested against Heliothis armigera larvae. Transgenic plants were confirmed through PCR. First instar larvae of H. armigera were released on detached leaves of transformed and non-transformed plants. Insect bioassays showed 93–100% mortality of H. armigera larvae within 72 h on the leaves of transgenic plants while all larvae survived and continued feeding on detached leaves from non-transformed control plants. The Hvt gene expressing under phloem specific RSs1 and RolC promoters could therefore be used for developing H. armigera-resistant, genetically-modified crops.
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Acknowledgments
We would like to thank Dr. Tiziana Pandoifini, Italy for providing plasmid vector containing RolC promoter for this study. We acknowledge Dr. Imran Amin and Dr. Muhammad Ashfaq for providing technical support in qPCR and insect bioassays respectively. We are also thankful to Agriculture Department, Government of Sindh, Pakistan for providing PhD study fellowship to Allah Dino Shah.
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Shah, A.D., Ahmed, M., Mukhtar, Z. et al. Spider toxin (Hvt) gene cloned under phloem specific RSs1 and RolC promoters provides resistance against American bollworm (Heliothis armigera). Biotechnol Lett 33, 1457–1463 (2011). https://doi.org/10.1007/s10529-011-0572-1
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DOI: https://doi.org/10.1007/s10529-011-0572-1