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Mutation of an Arginine Biosynthesis Gene Causes Reduced Pathogenicity in Fusarium oxysporum f. sp. melonis

April 2001 , Volume 14 , Number  4
Pages  580 - 584

Fumio Namiki , 1 Michiko Matsunaga , 2 Mitsuru Okuda , 2 Iori Inoue , 2 Kazufumi Nishi , 1 Yoshikatsu Fujita , 1 and Takashi Tsuge 2

1Kyusyu National Agricultural Experiment Station, Nishigoshi-Machi, Kikuchi-Gun 861-1192, Japan; 2Graduate School of Bioagricultural Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan

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Accepted 5 January 2001.

Restriction enzyme-mediated integration (REMI) mutagenesis was used to tag genes required for pathogenicity of Fusarium oxysporum f. sp. melonis. Of the 1,129 REMI transformants tested, 13 showed reduced pathogenicity on susceptible melon cultivars. One of the mutants, FMMP95--1, was an arginine auxotroph. Structural analysis of the tagged site in FMMP95-1 identified a gene, designated ARG1, which possibly encodes argininosuccinate lyase, catalyzing the last step for arginine biosynthesis. Complementation of FMMP95--1 with the ARG1 gene caused a recovery in pathogenicity, indicating that arginine auxotrophic mutation causes reduced pathogenicity in this pathogen.

© 2001 The American Phytopathological Society