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Theoretical and Applied Genetics

, Volume 105, Issue 6–7, pp 809–814 | Cite as

Overexpression of the wasabi defensin gene confers enhanced resistance to blast fungus (Magnaporthe grisea) in transgenic rice

  •  H. Kanzaki
  •  S. Nirasawa
  •  H. Saitoh
  •  M. Ito
  •  M. Nishihara
  •  R. Terauchi
  •  I. Nakamura

Abstract.

Transgenic rice (Oryza sativa cv. Sasanishiki) overexpressing the wasabi defensin gene, a plant defensin effective against the rice blast fungus, was generated by Agrobacterium tumefaciens-mediated transformation. Twenty-two T2 homozygous lines harboring the wasabi defensin gene were challenged by the blast fungus. Transformants exhibited resistance to rice blast at various levels. The inheritance of the resistance over generations was investigated. T3 plants derived from two highly blast-resistant T2 lines (WT14-5 and WT43-5) were challenged with the blast fungus using the press-injured spots method. The average size of disease lesions of the transgenic line WT43-5 was reduced to about half of that of non-transgenic plants. The 5-kDa peptide, corresponding to the processed form of the wasabi defensin, was detected in the total protein fraction extracted from the T3 progeny. Transgenic rice plants overproducing wasabi defensin are expected to possess a durable and wide-spectrum resistance (i.e. field resistance) against various rice blast races.

Rice Defensin Rice blast fungus Agrobacterium tumefaciens 

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Copyright information

© Springer 2002

Authors and Affiliations

  •  H. Kanzaki
    • 1
  •  S. Nirasawa
    • 1
  •  H. Saitoh
    • 1
  •  M. Ito
    • 1
  •  M. Nishihara
    • 1
  •  R. Terauchi
    • 1
  •  I. Nakamura
    • 2
  1. 1.Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate, 024-0003 Japan
  2. 2.Graduate School of Science and Technology, Chiba University, 648 Matsudo, Matsudo, Chiba 271-0092, Japan

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