Progress of sweetpotato cross-incompatibility research

Sweetpotato is an important food crop, with high starch content and rich nutrients in tuberous root. For sweetpotato breeding, cross breeding is the main breeding way. However, the characteristics of intraspecific and interspecific cross-incompatibility are the serious obstacle for sweetpotato crossbreeding and germplasm resources utilization. In order to overcome sweetpotato cross-incompatibility, lots of work had been carried out and focuses on mechanism study and overcoming method, including intraspecific cross-incompatibility group division, crossincompatibility physiology and molecular mechanism research, cross-incompatibility overcoming reagents selection and application, somatic hybridization applying in the cross-incompatibility overcoming and so on. Here, we reviewed the detailed research progress of these works, so as to provide a reference for sweetpotato cross-incompatibility overcoming and further research in related mechanism.