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Transgenic Research

, Volume 12, Issue 1, pp 23–31 | Cite as

Transgenic Expression of Trypsin Inhibitor CMe from Barley in Indica and Japonica Rice, Confers Resistance to the Rice Weevil Sitophilus Oryzae

  • Julio Alfonso-Rubí
  • Félix Ortego
  • Pedro Castañera
  • Pilar Carbonero
  • Isabel DíazEmail author
Article

Abstract

Indica and japonica rice (Oryza sativa L.) plants were transformed by particle bombardment with the Itr1 gene encoding the barley trypsin inhibitor BTI-CMe, under the control of its own promoter that confers endosperm specificity, and the maize ubiquitin promoter. From 38 independent transgenic lines of indica (breeding line IR58) and 15 of the japonica (cv Senia) selected, 22 and 11, respectively, expressed the barley inhibitor at detectable levels. The transgene was correctly translated as indicated by western blot analysis with a level of expression in R3 seeds up to 0.31% (IR58) and 0.43% (Senia) of the total extracted protein. The functional integrity of BTI-CMe was confirmed by trypsin activity assays in liquid media and by activity staining gels, performed with seed extracts. The significant reduction of the survival rate of the rice weevil (Sitophilus oryzae, Coleoptera: Curculionidae) reared on homozygous transgenic indica and japonica rice seeds expressing the BTI-CMe, compared to non-transformed controls, and the decrease in the trypsin-like activity of insect crude midgut extracts, confirmed the utility of this proteinase inhibitor gene for the control of important storage pests.

barley trypsin inhibitor Sitophilus oryzae storage pest resistance transgenic rice 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Julio Alfonso-Rubí
    • 1
  • Félix Ortego
    • 2
  • Pedro Castañera
    • 2
  • Pilar Carbonero
    • 1
  • Isabel Díaz
    • 1
    Email author
  1. 1.Laboratorio de Bioquímica y Biología Molecular, Departamento de Biotecnología-UPME.T.S.Ingenieros AgrónomosMadridSpain
  2. 2.Departamento de Biología de Plantas, Centro de Investigaciones Biológicas, CSICMadridSpain

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