Article Abstract:
The Cf-4 disease resistance gene and its dispersion in Lycopersicon germplasm have been studied. Despite nomenclature changes, all accessions seen harbor the same Cf-4 locus, probably from one donor. Origin of the Cf-4 and reasons for discrepancies from other reports are discussed.
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Article Abstract:
Evidence for close linkage of two Oicium lycopersicum, powdery mildew, genes on chromosome 6 of tomato exists, based on characterization and mapping of resistance to O. lycopersicum in two Lycopersicon hirsutum accessions. Resistance to O. lycopersicum is apparently widely distributed across Lycopersicon species. Allelism tests for Ol-1, the resistance gene, and Ol-3 were carried out.
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Article Abstract:
Cloning and molecular analysis of the tomato resistance locus, Cf-2, revealed two almost identical genes. Amino acid sequence analyses showed that the two genes encode leucine-rich repeat proteins that differ from each other only by three amino acids. These proteins recognize bacterial pathogen and activate plant defenses. The C-terminus of the protein molecules have domains homologous to the conserved regions in the protein encoded by the Cf-9 gene. It is suggested that these conserved regions promote plant resistance to pathogens.
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