There are 7 species of genus Torreya in existence,with large barriers of sexual reproduction and scarce wild germplasm resources. Most of them are key protected plants that are gradually endangered to endangered. Asexual reproduction is an essential prerequisite for expanding the population size,protecting,developing and using this genus. The current techniques used are mainly grafting,tissue culture and cuttings. Among them,the success rate of grafting is affected by the affinity and vigor of scion and rootstock,grafting method and grafting period,etc.;tissue culture effect are closely related to plant genotype,explant type and material extraction time,basic medium type,hormone type and concentration,exogenous additives and culture environment;the rooting rate of cuttings is closely related to cutting type,cutting period,cutting substrate,the type,concentration and treatment time of exogenous hormones,and management after cutting. In the future,it is necessary to continue to strengthen the research on asexual reproduction technology,and to explore its mechanism,thus to fundamentally solve the problem of asexual reproduction of the genus Torreya,and finally to comprehensively promote the application of asexual reproduction technology in the expansion of the population of genus Torreya.
