title: Genetic polymorphism of ferula mushroom growing on Ferula sinkiangensis.
abstract: Mating tests, internal transcribed spacer (ITS) sequence analysis, intergenic spacer 1-restriction fragment length polymorphism (IGS1-RFLP), IGS1 sequence analysis, and IGS2-RFLP analysis were carried out on isolates of 17 morphologically different Pleurotus mushrooms collected on Ferula sinkiangensis. The isolates were divided, based on mating tests and ITS sequence analysis, into two groups identical to P. eryngii var. ferulae and P. nebrodensis, respectively. Single spores from these two groups were incompatible, but those from P. eryngii var. ferulae and P. eryngii were compatible and combined to produce 56.25% dikaryon mycelia with clamp connections. The ITS of P. eryngii var. ferulae and P. nebrodensis (GenBank accession no. AY311408) were both 638 bp in size but differed by 3% in sequence. P. eryngii var. ferulae and P. eryngii (GenBank accession no. AY368658) were identical in ITS size and sequence. P. nebrodensis was the dominant population of Pleurotus mushroom growing on F. sinkiangensis. It exhibited genetic diversity. The two species could also be distinguished by IGSI-RFLP, similar to identification by mating tests and ITS sequence analysis. Difference in IGS1-RFLP existed between P. eryngii var. ferulae and P. nebrodensis. The sequence difference reached 2.28%. Both IGS1 size and IGS1-RFLP were similar among the different samples of P. nebrodensis. The 17 isolates were separated into five types based on IGS2 size and IGS2-RFLP, with both interspecies and extraspecies differences. P. nebrodensis exhibited polymorphism and was divided into four types. These results agreed with macroscopic differences. IGS2 might be the effective domain of genetically polymorphic ribosomal DNA in P. nebrodensis mushrooms found in Xinjiang, China.
authors.affiliation: Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, China.
authors.forename: Jin Xia
authors.initials: JX
authors.lastname: Zhang
authors.forename: Chen Yang
authors.initials: CY
authors.lastname: Huang
authors.forename: Tzi Bun
authors.initials: TB
authors.lastname: Ng
authors.forename: He Xiang
authors.initials: HX
authors.lastname: Wang
mesh_terms: D002681:China; D004271:DNA, Fungal / Q000032:analysis / Q000302:isolation & purification; D021903:DNA, Ribosomal Spacer / Q000032:analysis*; D005309:Ferula / Q000382:microbiology*; D008969:Molecular Sequence Data; D016533:Mycological Typing Techniques; D020076:Pleurotus / Q000145:classification* / Q000235:genetics*; D011110:Polymorphism, Genetic; D012150:Polymorphism, Restriction Fragment Length; D017422:Sequence Analysis, DNA
chemical_list: D004271:DNA, Fungal; D021903:DNA, Ribosomal Spacer