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 artificially inoculated with viruliferous leafhoppers under screenhouse and evaluated for MSVD resistance. Using 948 DArT markers, we identified 18 quantitative trait loci (QTLs) associated with different 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 different parameters associated with MSVD resistance. Moreover, the consistent appearance of QTL on chromosome 7 for MSVD resistance is illustrating the need for fine-mapping of this locus. In conclusion, these QTLs could provide additional source for breeders to develop MSV resistance.

https://dx.doi.org/10.1007/s42976-020-00020-5

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Abebe Menkirhttps://orcid.org/0000-0002-5907-9177

P. Lava Kumarhttps://orcid.org/0000-0003-4388-6510

Melaku Gedilhttps://orcid.org/0000-0002-6258-6014

Garcia-Oliveira ALhttps://orcid.org/0000-0001-8561-4172

https://dx.doi.org/10.1007/s42976-020-00020-5

Biotech and Plant Breeding; Plant Production and Health

Agronomy; Disease Control; Food Security; Maize; Plant Breeding; Plant Diseases; Plant Health; Plant Production

Maize; Maize Streak Geminivirus; Quantitative Trait Loci; Subsaharan Africa; Disease Resistance

Africa; West Africa

Nigeria

Headquarters and Western Africa Hub

Cereal Research Communications