Quantitative trait loci mapping for resistance to maize streak virus in F2:3 population of tropical maize

Garcia-Oliveira, A. L. and Menkir, A. and Kumar, P. Lava and Azuh, V. and Jacob, O. O. and Gedil, M. (2020) Quantitative trait loci mapping for resistance to maize streak virus in F2:3 population of tropical maize. CEREAL RESEARCH COMMUNICATIONS, 48 (2). pp. 195-202. ISSN 0133-3720 (print), 1788-9170 (online)

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Abstract

Maize streak virus (MSV) continues to be a major biotic constraint for maize production throughout Africa. Concerning the quantitative nature of inheritance of resistance to MSV disease (MSVD), we sought to identify new loci for MSV resistance in maize using F2:3 population. The mapping population was artifcially inoculated with viruliferous leafhoppers under screenhouse and evaluated for MSVD resistance. Using 948 DArT markers, we identifed 18 quantitative trait loci (QTLs) associated with diferent components of MSVD resistance accounting for 3.1–21.4% of the phenotypic variance, suggesting that a total of eleven genomic regions covering chromosomes 1, 2, 3, 4, 5 and 7 are probably required for MSVD resistance. Two new genomic regions on chromosome 4 revealed the occurrence of co-localized QTLs for diferent parameters associated with MSVD resistance. Moreover, the consistent appearance of QTL on chromosome 7 for MSVD resistance is illustrating the need for fne-mapping of this locus. In conclusion, these QTLs could provide additional source for breeders to develop MSV resistance.

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