华山新麦草易位系抗黄矮病的鉴定

小麦黄矮病在田间由麦蚜传播大麦黄矮病毒(BYDV)感染引起。为给优质抗BYDV小麦新品种提供重要种质资源,采用堆测法种植材料,利用饲毒蚜虫接种病毒BYDV-GAV的方式,对27份华山新麦草易位系材料进行了抗病性鉴定,比较了接种病毒后各材料的病情指数及其千粒重。结果表明,27份华山新麦草易位系中,5份材料的病情指数介于13.56～18.89,表现为抗BYDV-GAV;9份材料的病情指数是介于27.78～48.89,表现为感BYDV-GAV;其余13份材料的病情指数均大于50.0,表现高感BYDV-GAV。不同华山新麦草易位系对BYDV-GAV抗性差异较大,筛选出的5份抗黄矮病材料可为培育优质抗病毒新品种提供重要种质资源。

Evaluation of Psathyrostachys huashanica Translocation Lines Resistance to Barley Yellow Dwarf Disease

Yellow dwarfis is caused by wheat aphid transmission of viruses(BYDV). With hill plot technique to sow wheat later,resistance identifications of 27 P.huashanica translocation lines is to BYDV-GAV were conducted by inoculation of viruliferous aphids in the field. The results showed that the disease index of 5 P.huashanica translocation lines existed in the range of 13.56-18.89,indicating them better resistance to infection of BYDV-GAV. Additionally,9 lines of them with disease index between 27.78 and 48.89,were susceptible to infection of BYDV-GAV. Other 13 lines with disease index over 50.0,lines highly susceptible to yellow dwarf virus. Identification of disease resistance revealed that the translocation lines of P.huashanica contained disease-resistant,disease-susceptible and highly susceptible types,and 5 lines from which had been screened may provide important germplasm resources for high-quality antiviral variety breeding.