Abstract
The insecticidal cry genes of Bacillus thuringiensis (Bt) have been successfully used for development of insect resistant transgenic rice plants. In this study, a novel cry2AX1 gene consisting a sequence of cry2Aa and cry2Ac gene driven by rice rbcS promoter was introduced into a rice cultivar, ASD16. Among 27 putative rice transformants, 20 plants were found to be positive for cry2AX1 gene. The expression of Cry2AX1 protein in transgenic rice plants ranged from 5.95 to 122.40 ng/g of fresh leaf tissue. Stable integration of the transgene was confirmed in putative transformants of rice by Southern blot hybridization analysis. Insect bioassay on T0 transgenic rice plants against rice leaffolder (Cnaphalocrosis medinalis) recorded larval mortality up to 83.33 %. Stable inheritance and expression of cry2AX1 gene in T1 progenies was demonstrated using Southern and ELISA. The detached leaf bit bioassay with selected T1 plants showed 83.33–90.00 % mortality against C. medinalis. The whole plant bioassay for T1 plants with rice leaffolder showed significant level of resistance even at a lower level of Cry2AX1 expression varying from 131 to 158 ng/g fresh leaf tissue during tillering stage.
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Abbreviations
- rbcS :
-
Ribulose biphosphate carboxylase
- SSC:
-
Saline-sodium citrate
- SDS:
-
Sodium dodecyl sulphate
- dCTP:
-
Deoxycytidine triphosphate
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Acknowledgments
We thank Prof. Dr. S. Suresh and Dr. R. P. Soundararajan, Assistant Professor (Department of Entomology, TNAU, Coimbatore) for providing facilities for rearing of rice leaffolder. We thank Dr. K. K. Kumar, Assistant Professor (Department of Plant Biotechnology, TNAU) for his help in Southern analysis.
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Manikandan, R., Balakrishnan, N., Sudhakar, D. et al. Development of leaffolder resistant transgenic rice expressing cry2AX1 gene driven by green tissue-specific rbcS promoter. World J Microbiol Biotechnol 32, 37 (2016). https://doi.org/10.1007/s11274-015-2006-z
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DOI: https://doi.org/10.1007/s11274-015-2006-z