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.

中文翻译：

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热带玉米 F2:3 群体抗玉米条纹病毒的数量性状位点定位

玉米条纹病毒 (MSV) 仍然是整个非洲玉米生产的主要生物制约因素。关于 MSV 病 (MSVD) 抗性遗传的定量性质，我们试图使用 F2:3 群体在玉米中鉴定 MSV 抗性的新位点。作图种群在筛网下人工接种有病毒的叶蝉，并评估 MSVD 抗性。使用 948 个 DArT 标记，我们确定了 18 个与 MSVD 抗性不同成分相关的数量性状位点 (QTL)，占表型变异的 3.1-21.4%，表明共有 11 个基因组区域覆盖了染色体 1、2、3、4、 MSVD 抗性可能需要 5 和 7。4 号染色体上的两个新基因组区域揭示了与 MSVD 抗性相关的不同参数的共定位 QTL。此外，针对 MSVD 抗性在 7 号染色体上一致出现的 QTL 说明需要对该基因座进行精细定位。总之，这些 QTL 可以为育种者发展 MSV 抗性提供额外的来源。