אסיף מאגר המחקר החקלאי

The l2c family from the wilt disease resistance locus l2 belongs to the nucleotide binding, leucine-rich repeat superfamily of plant resistance genes

Year:

1997

Source of publication :

Authors :

Volume :

9

Co-Authors:

Ori, N., Department of Plant Genetics, Weizmann Institute of Science, P.O. Box 26, Rehovot 76100, Israel
Eshed, Y., Dept. of Field and Vegetable Crops, Faculty of Agriculture, Hebrew University of Jerusalem, 76100, Israel
Paran, I., Dept. of Field and Vegetable Crops, Faculty of Agriculture, Hebrew University of Jerusalem, 76100, Israel
Presting, G., Dept. of Plant Breeding and Biometry, Cornell University, Ithaca, NY 14853-1901, United States
Aviv, D., Department of Plant Genetics, Weizmann Institute of Science, P.O. Box 26, Rehovot 76100, Israel
Tanksley, S., Dept. of Plant Breeding and Biometry, Cornell University, Ithaca, NY 14853-1901, United States
Zamir, D., Dept. of Field and Vegetable Crops, Faculty of Agriculture, Hebrew University of Jerusalem, 76100, Israel
Fluhr, R., Department of Plant Genetics, Weizmann Institute of Science, P.O. Box 26, Rehovot 76100, Israel

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Abstract:

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 l2C, were isolated by map-based cloning from the 12 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 l2C antisense transgenes abrogated race 2 but not race 1 resistance in otherwise normal plants. Expression of the complete sense l2C-1 transgene conferred significant but partial resistance to F. o. lycopersici race 2. All members of the l2C gene family have been mapped genetically and are dispersed on three different chromosomes. Some of the l2C members cosegregate with other tomato resistance loci. Comparison within the leucine-rich repeat region of l2C gene family members shows that they differ from each other mainly by insertions or deletions.

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