Kanwar, J. S., E. A. Kerr, and P. M Harney Linkage of Cf-12 to Cf-24 genes for resistance to tomato leaf mold,
Cladosporium fulvum Cke.
Previous work (TGC 22:15-16; 25:22; 27:14; 27:25; 28:18-19; 28:19) indicates that- many genes for
resistance to Cladosporium fulvum exist. The linkage relations of the genes previously named Cf-1 to Cf-11 have
been reported by us in another Note in this Report.
Thirteen additional dominant resistant genes have been obtained from various accessions of primitive
Lycopersicon esculentum and L. pimpinellifolium. Their uniqueness has been determined by tests for allelism and
they are now named Cf-12 to Cf-24.
This study has determined the approximate chromosomal location of all these genes. From the data, it
appears that Cf-12 is on chromosome 8 at position 31. This increases the known length of this chromosome and will
require renumbering of the positions of the other 3 at positions 67 and 0 respectively. Cf-16 and Cf-17 are on
chromosome 11 (very closely linked between j-2 and a) at positions 22 and 20. Cf-20, Cf-19 and Cf-18 are on 2 at
positions 50, 84 and 105 respectively. Cf-21 is on 4 between ful and e at 45; Cf-22 is on 1 between br and u at 15.
Cf-23 is on 7 and is tentatively placed at 36. If this position is confirmed, the locations of the genes on chromosome
7 will have to be revised. Cf-24 is on 5 between mc and wt at 36 units from mc. Further tests are necessary to
determine the exact locations of these genes.
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