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Molecular Analysis of AK-Toxin Biosynthesis in the Japanese Pear Pathotype of Alternaria Alternata

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Molecular Genetics of Host-Specific Toxins in Plant Disease

Part of the book series: Developments in Plant Pathology ((DIPP,volume 13))

Abstract

To understand the molecular basis of pathogenic specialization in Alternaria alternata pathogens, our efforts have focused on cloning the genes required for biosynthesis of host-specific toxins. Among the seven pathotypes of A. alternata, we have studied mainly the Japanese pear pathotype, which causes black spot of Japanese pear by producing a host-specific toxin known as AK-toxin. We have pursued two independent approaches for cloning the genes. The first approach was an effort to clone the genes by complementation of the function of AK-toxin-deficient (Tox-) mutants with a cosmid genomic library from a wild-type strain. The second approach was to tag and clone the genes by restriction enzyme-mediated integration (REMI) of transforming DNA. We recently succeeded in isolating Tox mutants by REMI. The tagged genomic locus was recovered from a mutant and shown to contain the gene required for AK-toxin biosynthesis.

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© 1998 Springer Science+Business Media Dordrecht

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Tsuge, T., Tanaka, A., Hatta, R., Shiotani, H. (1998). Molecular Analysis of AK-Toxin Biosynthesis in the Japanese Pear Pathotype of Alternaria Alternata . In: Kohmoto, K., Yoder, O.C. (eds) Molecular Genetics of Host-Specific Toxins in Plant Disease. Developments in Plant Pathology, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5218-1_5

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  • DOI: https://doi.org/10.1007/978-94-011-5218-1_5

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-94-010-6197-1

  • Online ISBN: 978-94-011-5218-1

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