1The Sainsbury Laboratory, John Innes Centre, Colney Lane, Norwich, NR4 7UH, UK; 2Laboratory of Gene Expression, Department of Molecular and Structural Biology, University of Aarhus, Gustav Wiedsvej 10, DK-8000 Aarhus C, Denmark
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Accepted 1 June 1998.
Four nodulation mutants of Lotus japonicus affected in three different genetic loci blocked infection by Glomus intraradices within rhizodermal cells where abnormal deformations of hyphae occurred. Rare successful infections led to the formation of arbuscules. The affected plant genes are therefore essential during the early infection process, but are dispensable for later developmental stages.
© 1998 The American Phytopathological Society