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As apple possesses self-incompatibility,knowledge of the S-genotypes is very important for apple breeding and cultivation.We investigated the S-RNase genotypes of 13 type 2 red-fleshed apple cultivars and 8 lineages.All of the investigated type 2 red-fleshed apples contained the S3-RNase allele closely linked to the red-fleshed trait.We made a search system for ovule parents to efficiently produce new type 2 red-fleshed cultivars based on the S-RNase allele information (http://www.agr.nagoya-u.ac.jp/～hort/apple/red/).More than 90％ of progenies from crossing a selected white-fleshed ovule parent with a type 2 red-fleshed pollen parent are expected to show the red-fleshed phenotype.We also compiled a database of the S-RNase genotypes of more than 1 000 apple cultivars,including a survey system of cultivar combinations showing those that were fully incompatible,semicompatible and fully compatible,written in Chinese (http://www.agr.nagoya-u.ac.jp/～hort/apple/ch/) and Japanese (http://www.agr.nagoya-u.ac.jp/～hort/apple/ja/).