ABSTRACT
ObjectiveTo establish a rapid screening method for germplasm materials of Gastrodia elata with high purity， and lay a foundation for pure line breeding and cross breeding. MethodBased on the whole genome sequencing and population resequencing of G. elata， 20 restriction fragment length polymorphism (RFLP) markers were developed by single nucleotide polymorphism (SNP) sites. The polymerase chain reaction (PCR)-RFLP method was used to carry out restriction endonuclease experiments on 20 RFLP markers of 15 G. elata germplasms. According to the number of enzymatic bands at 20 RFLP marker sites, the purity of 15 germplasms was calculated and evaluated. On this basis, genome resequencing technology was used to verify the assessment results. ResultTen germplasm materials with purity greater than 95% were screened out by PCR-RFLP method， 3 of which had 95% purity and 7 had 100% purity. Nine germplasm materials with purity greater than 95% were screened out by genome resequencing methods, and 8 of them were consistent with the results of PCR-RFLP. ConclusionThe PCR-RFLP method established in this study for screening G. elata germplasms with high purity precision of RFLP markers has 80% precision and 89% accuracy. The method is simple， efficient， and significantly less expensive than genome resequencing method, which provides technical support for pure line breeding of G. elata and references for breeding of other Chinese medicinal materials.