玉米矮花叶病毒抗性资源鉴定的研究

Evaluation of Maize Germplasm for Resistance to Maize Dwarf Mosaic Virus Strain B

利用人工接毒方法对 70份玉米种质资源进行了两年玉米矮花叶病毒B株系的抗性鉴定。依据病情指数 ( % )将抗病程度分为高抗、抗、中抗及感病 4个等级。试验筛选出高抗自交系 4份、高抗单交种 3个、抗病毒自交系 10份、抗病单交种 3个 ;中抗自交系 6份、中抗群体 3个。

Seventy maize germplasm inoculated twice by hand rubbing on the leaves with the infectious leaf solution plus 600 mesh of carborundum were evaluated for resistance to maize dwarf mosaic virus strain B in Tangshan Institute of Agricultural Sciences,Hebei province.The rating system was conducted on a scale of 0 to 3 and disease severity index(%) was used to distinguish resistant or susceptible genotypes which represented 0-10% high resistant;10 1%-30% resistant;30 1%-40% moderately resistant and >40% susceptible.The results showed that three domestic and one exotic maize lines and three single crosses were high resistant;seven domestic and six exotic lines,and three hybrids resistant,six lines and three CIMMYT populations moderately resistant and others susceptible.The application of these germplasm in maize breeding program was discussed.