Data from: Genetic analysis of sugarcane mosaic virus resistance in the Wisconsin Diversity Panel of maize

Sugarcane mosaic virus (SCMV) and Maize dwarf mosaic virus can cause yield
loss in maize (Zea mays L.). Previous studies identified two key genomic
regions controlling host resistance: Scmv1 on chromosome 6 and Scmv2 on
chromosome 3. In this study a diverse set of 578 inbreds adapted to a
northern US Corn Belt environment, was inoculated at the three-leaf stage
with SCMV and rated for presence of virus symptoms at 7, 10, 14, 21, 28,
and 35 d after inoculation. Scmv1 was present in all resistant inbreds. A
single-nucleotide polymorphism associated with SCMV resistance was found 5
Mb downstream of the putative location of Scmv1, and resistance at this
downstream locus was correlated with a group of inbreds containing the
presence allele of a 2.7-Mb presence–absence variation (PAV) in the region
encompassing Scmv1. The Scmv2 region was associated with resistance 35 d
after inoculation only among the inbreds containing the presence allele,
including Scmv1. Several other loci unlinked to Scmv1 and Scmv2 were
associated with resistance in this panel, providing evidence for
multigenic modification of the efficacy of Scmv1 and Scmv2. Sixty-nine
inbreds representing haplotype variation in the region surrounding Scmv1
on chromosome 6 were inoculated with SCMV at the three- and six-leaf
stage. Symptom development was reduced when inoculation was delayed to the
six-leaf stage, but 24 inbreds became fully symptomatic after 35 d
regardless of the growth stage at inoculation. Inbreds with the presence
allele of the PAV encompassing Scmv1 were more resistant to SCMV when
inoculation was delayed to the six-leaf stage than those that had the
absence allele. Inbreds with the absence allele were susceptible
regardless of growth stage at inoculation.