Identification of Resistance of Tropical Maize Germplasms to Rough Dwarf Disease and Germplasm Innovation

In this paper,108 tropical maize germplasm resources from CIMMYT were used as the tested materials,and their resistances to rough dwarf disease were identified in the serious prevalence area of this disease.It was found that 3 materials were highly resistant and 19 materials were resistant to rough dwarf disease.The tropical maize germplasm Qi 319 was taken as the donor of rough dwarf disease-resistant gene,and it was used to improve maize inbred line Su 951.Finally,two materials with resistance to rough dwarf disease were screened out from 117 BC3F2∶3.The breeding strategy of using tropical maize germplasms to improve maize inbred line in temperate zone was also discussed.