Brassica oleracea plant, comprising a dominant resistance gene to Albugo candida, the cause of white blister, wherein the resistance gene comes from the Brassica oleracea plant, the seeds of which were deposited on 1 March 2006 in the American Type Culture Collection (ATCC, Patent Depository, 10801 University Boulevard, Manassas, VA 20110, United States of America) under number PTA 74-12, wherein said Brassica oleracea plant is obtained by a method comprising: (a) providing Brassica oleracea plant PTA 74-12; (b) crossing Brassica oleracea plant PTA 74-12 with a susceptible Brassica oleracea plant; (c) isolating genomic DNA from the progeny for detecting the presence of an introgression with the resistance gene using one or more specific inter simple sequence repeat (iSSR) primers selected from the group consisting of SEQ ID Nos. 1 to 9 to detect random amplified microsatellite polymorphisms (RAMPs) linked to the resistance gene; and (d) selecting from the progeny a Brassica oleracea plant in which the presence of the introgression with the resistance gene has been demonstrated in step (c); wherein the random amplified microsatellite polymorphisms (RAMPs) are selected from the group consisting of: - a fragment of 325 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 1 and SEQ ID No. 10; - a fragment of 393 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 2 and SEQ ID No. 10; - a fragment of 508 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 3 and SEQ ID No. 10; - a fragment of 830 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 4 and SEQ ID No. 10; - a fragment of 285 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 5 and SEQ ID No. 10; - a fragment of 607 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 6 and SEQ ID No. 10; - a fragment of 875 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 7 and SEQ ID No. 10; - a fragment of 291 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 8 and SEQ ID No. 10; - a fragment of 138 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 9 and SEQ ID No. 10; wherein SEQ ID No. 10 is an Operon RAPD ® primer from 10-mer kits A-01 to BH-20. (a) providing Brassica oleracea plant PTA 74-12; (b) crossing Brassica oleracea plant PTA 74-12 with a susceptible Brassica oleracea plant; (c) isolating genomic DNA from the progeny for detecting the presence of an introgression with the resistance gene using one or more specific inter simple sequence repeat (iSSR) primers selected from the group consisting of SEQ ID Nos. 1 to 9 to detect random amplified microsatellite polymorphisms (RAMPs) linked to the resistance gene; and (d) selecting from the progeny a Brassica oleracea plant in which the presence of the introgression with the resistance gene has been demonstrated in step (c); - a fragment of 325 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 1 and SEQ ID No. 10; - a fragment of 393 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 2 and SEQ ID No. 10; - a fragment of 508 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 3 and SEQ ID No. 10; - a fragment of 830 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 4 and SEQ ID No. 10; - a fragment of 285 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 5 and SEQ ID No. 10; - a fragment of 607 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 6 and SEQ ID No. 10; - a fragment of 875 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 7 and SEQ ID No. 10; - a fragment of 291 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 8 and SEQ ID No. 10; - a fragment of 138 bp using the combination of the inter simple sequence repeat (iSSR) primer of SEQ ID No. 9 and SEQ ID No. 10;