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Development of transgenic finger millet (Eleusine coracana (L.) Gaertn.) resistant to leaf blast disease

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Abstract

Finger millet plants conferring resistance to leaf blast disease have been developed by inserting a rice chitinase (chi11) gene through Agrobacterium-mediated transformation. Plasmid pHyg-Chi.11 harbouring the rice chitinase gene under the control of maize ubiquitin promoter was introduced into finger millet using Agrobacterium strain LBA4404 (pSB1). Transformed plants were selected and regenerated on hygromycin-supplemented medium. Transient expression of transgene was confirmed by GUS histochemical staining. The incorporation of rice chitinase gene in R0 and R1 progenies was confirmed by PCR and Southern blot analyses. Expression of chitinase gene in finger millet was confirmed by Western blot analysis with a barley chitinase antibody. A leaf blast assay was also performed by challenging the transgenic plants with spores of Pyricularia grisea. The frequency of transient expression was 16.3% to 19.3%. Stable frequency was 3.5% to 3.9%. Southern blot analysis confirmed the integration of 3.1 kb chitinase gene. Western blot analysis detected the presence of 35 kDa chitinase enzyme. Chitinase activity ranged from 19.4 to 24.8. In segregation analysis, the transgenic R1 lines produced three resistant and one sensitive for hygromycin, confirming the normal Mendelian pattern of transgene segregation. Transgenic plants showed high level of resistance to leaf blast disease compared to control plants. This is the first study reporting the introduction of rice chitinase gene into finger millet for leaf blast resistance.

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Acknowledgements

The authors thank Dr S Muthukrishnan, Kansas State University, for kindly supplying plasmid pCAMBAR.Chi.11 and barley chitinase antibody, and Dr R Terada, Japan, for providing binary vectors and Agrobacterium strains. The authors are grateful to Entomology Research Institute for financial assistance.

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  1. Division of Plant Biotechnology, Entomology Research Institute, Loyola College, Chennai, 600 034, India

    S Ignacimuthu & S Antony Ceasar

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  1. S Ignacimuthu
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  2. S Antony Ceasar
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Correspondence to S Ignacimuthu.

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[Ignacimuthu S and Ceasar SA 2012 Development of transgenic finger millet (Eleusine coracana (L.) Gaertn.) resistant to leaf blast disease. J. Biosci. 37 XXX–XXX] DOI 10.1007/s12038-011-9178-y

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Ignacimuthu, S., Ceasar, S.A. Development of transgenic finger millet (Eleusine coracana (L.) Gaertn.) resistant to leaf blast disease. J Biosci 37, 135–147 (2012). https://doi.org/10.1007/s12038-011-9178-y

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  • DOI: https://doi.org/10.1007/s12038-011-9178-y

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