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Production of the AVR9 elicitor from the fungal pathogen Cladosporium fulvum in transgenic tobacco and tomato plants

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Abstract

Three constructs were used to study the expression of the avirulence gene Avr9 from the fungal tomato pathogen Cladosporium fulvum in plants. They include pAVIR1, pAVIR2 and pAVIR21, encoding the wild-type AVR9 protein and two hybrid AVR9 proteins containing the signal sequences of the pathogenesis-related proteins PR-S and PR-1a, respectively. Transgenic tobacco plants obtained with the three constructs showed a normal phenotype and produced AVR9 elicitor with the same specific necrosis-inducing activity as the wild-type AVR9 elicitor produced in planta by isolates of C. fulvum containing the Avr9 gene. Level of expression was not correlated with number of T-DNA integrations, but plants homozygous for the Avr9 gene produced more elicitor protein than heterozygous plants. The amino acid sequence of the processed AVR9 peptide present in apoplastic fluid (AF) of pAVIR1 transformed plants producing the wild-type AVR9 elicitor was identical to that of the wild-type AVR9 peptide isolated from C. fulvum-infected tomato leaves. Transgenic Cf0 genotypes of tomato, obtained by transformation with construct pAVIR21, showed a normal phenotype. However, transgenic F1 plants expressing the Avr9 gene, obtained from crossing transgenic Cf0 genotypes with wild-type Cf9 genotypes, showed delayed growth, necrosis and complete plant death indicating that the AVR9 peptide produced in plants carrying the Cf9 gene is deleterious. The necrotic defence response observed in Cf9 genotypes expressing the Avr9 gene support the potential to apply avirulence genes in molecular resistance breeding.

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Author notes

  1. Vivianne G. A. A. Vleeshouwers

    Present address: DLO-Centre for Plant Breeding and Reproduction Research (CPRO-DLO), P.O. Box 16, 6700 AA, Wageningen, Netherlands

Authors and Affiliations

  1. Department of Phytopathology, Wageningen Agricultural University, P.O. Box 8025, 6700 EE, Wageningen, Netherlands

    Guy Honée, Vivianne G. A. A. Vleeshouwers & Pierre J. G. M. de Wit

  2. MOGEN International n.v., Einsteinweg 97, 2333 CB, Leiden, Netherlands

    Leo S. Melchers & Jeroen S. C. van Roekel

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  4. Jeroen S. C. van Roekel
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  5. Pierre J. G. M. de Wit
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Honée, G., Melchers, L.S., Vleeshouwers, V.G.A.A. et al. Production of the AVR9 elicitor from the fungal pathogen Cladosporium fulvum in transgenic tobacco and tomato plants. Plant Mol Biol 29, 909–920 (1995). https://doi.org/10.1007/BF00014965

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  • DOI: https://doi.org/10.1007/BF00014965

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