摘要：The use of maize streak virus (MSV) resistance cultivars as donors in broadening the quality protein maize (QPM) inbreds would not only reduce the virulence of the disease but also improve grain yield and quality protein in Africa. This experiment was conducted to evaluate the general (GCA) and specific (SCA) combining ability of MSV resistance and QPM inbred lines for MSV resistance disease, grain yield and quality protein. Five QPM lines and five MSV-resistant cultivars were introgressed in a partial diallel design excluding reciprocals. The obtained 45 F1 crosses, 10 parents and 2 local varieties that served as checks were evaluated at the Lower Niger River Basin Authority, Oke-Oyi, Nigeria in 2014 and 2015 cropping seasons. The QPM lines derived from TZEQI 76, TZEQI 87 and TZEQI 79 that were introgressed with MSV resistant Acr. 91 Suwan-1-Sr C1 featured as most promising for grain yield, MSV resistance and grain quality protein. SCA and GCA variances were highly significant for all studied characters, implying that both non-additive and additive genetic effects were the vital portion of the genetic variances governing these characters. The ratio of k2GCA/ k2SCA that was more than one for grain yield and less than one for MSV resistance, lysine and tryptophan characters, indicating that except for grain yield, non-additive gene action played a major role in conditioning the inheritance of these characters. The evidence from this investigation would be worthwhile for developing MSV disease resistant, high grain yielding of quality protein maize varieties in Africa.
