ABSTRACT Castor (Ricinus communis L.) is a vegetable oil source plant whose production has decreased every year due to limited resistant cultivar. Grey mold disease caused by pathogenic fungi Botryotinia ricini is the main disease castor. The R gene generally encodes nucleotide binding site-leucine rich repeats (NBS-LRR). The aim of this study was to analyze the NBS-LRR sequence of castor plan…