title: Development of leaffolder resistant transgenic rice expressing cry2AX1 gene driven by green tissue-specific rbcS promoter.
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.
authors: Department of Plant Biotechnology, Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641 003, India.
authors: R
authors: R
authors: Manikandan
authors: Department of Plant Biotechnology, Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641 003, India.
authors: N
authors: N
authors: Balakrishnan
authors: Department of Plant Biotechnology, Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641 003, India.
authors: D
authors: D
authors: Sudhakar
authors: Department of Plant Biotechnology, Centre for Plant Molecular Biology and Biotechnology, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu, 641 003, India. udayvar@yahoo.com.
authors: V
authors: V
authors: Udayasuriyan
mesh_terms: D000818:Animals; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics; D060467:Disease Resistance; D004731:Endotoxins / Q000096:biosynthesis* / Q000235:genetics; D015870:Gene Expression; D006460:Hemolysin Proteins / Q000096:biosynthesis* / Q000235:genetics; D007814:Larva / Q000187:drug effects; D007915:Lepidoptera / Q000187:drug effects*; D012275:Oryza / Q000235:genetics*; D010935:Plant Diseases / Q000469:parasitology / Q000517:prevention & control*; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic; D011994:Recombinant Proteins / Q000096:biosynthesis* / Q000235:genetics; D016019:Survival Analysis
chemical_list: D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D004731:Endotoxins; D006460:Hemolysin Proteins; D011994:Recombinant Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis
keywords: C. medinalis; Cry2AX1; Transgenic rice; rbcS promoter