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Co-expression of chimeric chitinase and a polygalacturonase-inhibiting protein in transgenic canola (Brassica napus) confers enhanced resistance to Sclerotinia sclerotiorum

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Abstract

Objectives

Sclerotinia stem rot (SSR) caused by Sclerotinia sclerotiorum is one of the major fungal diseases of canola. To develop resistance against this fungal disease, the chit42 from Trichoderma atroviride with chitin-binding domain and polygalacturonase-inhibiting protein 2 (PG1P2) of Phaseolus vulgaris were co-expressed in canola via Agrobacterium-mediated transformation.

Results

Stable integration and expression of transgenes in T0 and T2 plants was confirmed by PCR, Southern blot and RT-PCR analyses. Chitinase activity and PGIP2 inhibition were detected by colorimetric and agarose diffusion assay in transgenic lines but not in untransformed plants. The crude proteins from single copy transformant leaves having high chitinase and PGIP2 activity (T16, T8 and T3), showed up to 44 % inhibition of S. sclerotiorum hyphal growth. The homozygous T2 plants, showing inheritance in Mendelian fashion (3:1), were further evaluated under greenhouse conditions for resistance to S. sclerotiorum. Intact plants contaminated with mycelia showed resistance through delayed onset of the disease and restricted size and expansion of lesions as compared to wild type plants.

Conclusions

Combined expression of chimeric chit42 and pgip2 in Brassica napus L. provide subsequent protection against SSR disease and can be helpful in increasing the canola production in Iran.

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Acknowledgments

We would like to acknowledge National Institute of Genetic Engineering and Biotechnology (Project No. 407-M) for providing financial for this work.

Supporting Information

Supplementary Table 1—The sequence of primers used in PCR and Southern blot analysis.

Author information

Authors and Affiliations

  1. National Institute of Genetic Engineering and Biotechnology (NIGEB), Tehran, Iran

    Mahboobeh Ziaei, Mostafa Motallebi, Mohammad Reza Zamani & Nasim Zarin Panjeh

Authors
  1. Mahboobeh Ziaei
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  2. Mostafa Motallebi
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  3. Mohammad Reza Zamani
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  4. Nasim Zarin Panjeh
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Corresponding author

Correspondence to Mostafa Motallebi.

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Ziaei, M., Motallebi, M., Zamani, M.R. et al. Co-expression of chimeric chitinase and a polygalacturonase-inhibiting protein in transgenic canola (Brassica napus) confers enhanced resistance to Sclerotinia sclerotiorum . Biotechnol Lett 38, 1021–1032 (2016). https://doi.org/10.1007/s10529-016-2058-7

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  • DOI: https://doi.org/10.1007/s10529-016-2058-7

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