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Plant Cell, Vol. 10, 1055-1068, June 1998, Copyright © 1998, American Society of Plant Physiologists

Dissection of the Fusarium I2 Gene Cluster in Tomato Reveals Six Homologs and One Active Gene Copy

Guus Simonsa, John Groenendijka, Jelle Wijbrandia, Martin Reijansa, José Groenena, Paul Diergaardea, Theo Van der Leea, Marjo Bleekera, Joke Onstenka, Michiel de Botha, Michel Haringb, Jurriaan Mesb, Ben Cornelissenb, Marc Zabeaua, and Pieter Vosa
a Keygene N.V., Agro Business Park 90, P.O. Box 216, 6700 AE Wageningen, The Netherlands
b University of Amsterdam, Institute for Molecular Cell Biology, Section Plant Pathology, Kruislaan 318, 1098 SM Amsterdam, The Netherlands

Correspondence to: Guus Simons, keygene{at}euronet.nl (E-mail), 31-317-424939 (fax).

The I2 locus in tomato confers resistance to race 2 of the soil-borne fungus Fusarium oxysporum f sp lycopersici. The selective restriction fragment amplification (AFLP) positional cloning strategy was used to identify I2 in the tomato genome. A yeast artificial chromosome (YAC) clone covering ~750 kb encompassing the I2 locus was isolated, and the AFLP technique was used to derive tightly linked AFLP markers from this YAC clone. Genetic complementation analysis in transgenic R1 plants using a set of overlapping cosmids covering the I2 locus revealed three cosmids giving full resistance to F. o. lycopersici race 2. These cosmids shared a 7-kb DNA fragment containing an open reading frame encoding a protein with similarity to the nucleotide binding site leucine-rich repeat family of resistance genes. At the I2 locus, we identified six additional homologs that included the recently identified I2C-1 and I2C-2 genes. However, cosmids containing the I2C-1 or I2C-2 gene could not confer resistance to plants, indicating that these members are not the functional resistance genes. Alignments between the various members of the I2 gene family revealed two significant variable regions within the leucine-rich repeat region. They consisted of deletions or duplications of one or more leucine-rich repeats. We propose that one or both of these leucine-rich repeats are involved in Fusarium wilt resistance with I2 specificity.




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