Abstract: Germplasm resource of maize resistant to Maize rough dwarf virus(MRDV) is not very rich in China,therefore importing from Argentina and selecting varieties resistant to MRDV is significant to our breeding for disease resistance.Through identification of resistance to MRDV about 12 maize materials newly imported from Argentina in 2013,2014,using NCⅡ experimental design and identifying the MRDV resistance as well as analyzing combining ability of 48 hybrid combinations come from crossing the 12 maize materials and 4 key inbred lines in two dates.The results showed that sowing time had a great influence on MRDV,the inbred lines CA1106,CA1108,CA1107 groups CA1104,CA1103 were resistant to MRDV;Based on combining ability analysis of 48 combinations,Chang 7-2×CA1107 was resistant to MRDV;Significant difference was found in the general combining ability for 12 introduced new materials,CA1104 and CA1107 had good general combining ability,so it had a high potential as resistant cultivars;The special combining ability effect value was significant different between 48 combinations,the combinations Zheng 58×CA1106,PH6WC×CA1101,Chang 7-2×CA1102,PH6WC×CA1107,Zheng 58×CA1303,PH4CV×CA1102's special combining ability effect value was pretty low,so it could be used in breeding for disease resistance.Further analysis of genetic parameters showed that inheritance of this trait was major in additive effect while there was certain non-additive effect,and this trait was influenced by the environment greatly.Inbred lines CA1107 and group CA1104 were the best resistant to MRDV,and their general combining ability was higher,which could be used in disease resistant breeding.

Key words: Maize, Maize rough dwarf virus(MRDV), Resistance, Combining ability

CLC Number: 

• S326

• S435