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THE PLANT CELL, Vol 9, Issue 4 521-532, Copyright © 1997 by American Society of Plant Biologists
The I2C Family from the Wilt Disease Resistance Locus I2 Belongs to the Nucleotide Binding, Leucine-Rich Repeat Superfamily of Plant Resistance Genes
N. Ori, Y. Eshed, I. Paran, G. Presting, D. Aviv, S. Tanksley, D. Zamir and R. Fluhr
Department of Plant Genetics, Weizmann Institute of Science, P.O. Box 26, Rehovot 76100, Israel
Characterization of plant resistance genes is an important step in
understanding plant defense mechanisms. Fusarium oxysporum f sp lycopersici
is the causal agent of a vascular wilt disease in tomato. Genes conferring
resistance to plant vascular diseases have yet to be described molecularly.
Members of a new multigene family, complex I2C, were isolated by map-based
cloning from the I2 F. o. lycopersici race 2 resistance locus. The genes
show structural similarity to the group of recently isolated resistance
genes that contain a nucleotide binding motif and leucine-rich repeats.
Importantly, the presence of I2C antisense transgenes abrogated race 2 but
not race 1 resistance in otherwise normal plants. Expression of the
complete sense I2C-1 transgene conferred significant but partial resistance
to F. o. lycopersici race 2. All members of the I2C gene family have been
mapped genetically and are dispersed on three different chromosomes. Some
of the I2C members cosegregate with other tomato resistance loci.
Comparison within the leucine-rich repeat region of I2C gene family members
shows that they differ from each other mainly by insertions or deletions.
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