Abstract: IGS1 genes were obtained by PCR amplification from genome DNA of Tricholoma matsutake fruit bodies collected from 16 counties in Yunnan . These gene fragments were digested by restriction endonuclease Cfr13Ⅰ . Two distinct IGS1 rDNA types were identified , namely A and C . Among the 127 fruit bodies investigated , 126 belong to type A while one from Jianchuan (T89) belongs to type C . Our results also showed that there are no significant heterogeneity in the IGS1 genes of these fruit bodies , except double CTTTs found in representative IGS1 gene of type A . The primary IGS1 RFLP patterns of Tricholoma matsutake from Yunnan are very similar to those from Japanese , implying that Tricholoma matsutake of these two areas are likely to be homologous .

Key words: Tricholoma matsutake