Abstract: The present invention relates to a gene encoding a protein which confers resistance to Albugo candida when expressed in a Raphanus sativus plant, wherein said gene comprises: a) a nucleotide sequence encoding a protein having an amino acid sequence, which has in order of increased preference at least 70%, 75%, 80%, 83%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100% sequence similarity to SEQ ID No. 3; or b) a nucleotide sequence comprising a coding sequence which has in order of increased preference at least 70%, 75%, 80%, 83%, 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, 100% sequence identity to SEQ ID No. 2; or c) a nucleotide sequence encoding at least the amino acid positions 15 to 192 of SEQ ID No. 3, the amino acid positions 209 to 432 of SEQ ID No. 3, and the amino acid positions 540 to 1023 of SEQ ID No. 3; or d) a nucleotide sequence encoding an LRR domain comprising the amino acid positions 540 to 1023 of SEQ ID No.