The data confirm the approximate locations of Cf-1 to Cf-4. Cf-1 is on Chromosome 1 at position 92. Cf-2 is
on 6 at 45. Cf-3 is on 11 at 0 and Cf-4 is on 1 at 94. The numbering on chromosome 11 will have to be revised as
the position of j-2 appears to be about position 11.
This study has determined the chromosomes on which Cf-5 to Cf-10 are located and gives a rough
indication of their position. Cf-5 is on chromosome 4 between ful and e at position 50. Cf-6 is on 12 at 26. Cf-7 and
Cf-8 are on 9 at 49 and 42 respectively. Cf-9 is on 10 at 35. Cf-10 is on 8 at 34.
Cf-11 is tentatively placed on chromosome 12 at approximately position 29. We also have suggestion of
linkage with marm on chromosome 9. Further data are being obtained to determine which is correct.
Several other resistance genes have been tentatively located but tests for allelism are not yet completed.
These results suggest that we have one more resistance gene on chromosome 1, 3 on 2, 2 on 3, 1 on 4, 1 on 5, 1
on 7, 1 on 8, and 1 to 3 on 11.
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