Dispersion of the Cf-4 disease resistance gene in Lycopersicon germplasm

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.

United Kingdom, Statistical Data Included, Plant genetics, Plants, Fungal diseases of plants, Plant fungal diseases, Plant hardiness, Natural immunity, Germplasm resources, Plant, Plant germplasm resources

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Characterization and mapping of resistance to Oidium lycopersicum in two Lycopersicon hisutum accessions: evidence for close linkage of two Ol-genes on chromosome 6 of tomato

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.

Disease transmission, Powdery mildew diseases, Plant diseases, Disease susceptibility

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The tomato Cf-2 disease resistance locus comprises two functional genes encoding leucine-rich repeat proteins

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.

Plant-pathogen relationships, Molecular biology

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