Variance in the mean number of foci of primary infection for N. tabacum.

Dilution is the dilution of the purified virions used to inoculate plants, and virion dose is the number of virions per inoculated plant, as estimated by the number of RNA molecules measured by RT-qPCR. Mean foci is the mean number of foci of primary infection, of both TEV-GFP and TEV-mCherry, in an inoculated leaf. Variance is the calculated variance of the mean number of foci of primary infection. Note that for a Poisson distribution, the mean is equal to the variance. We test this expectation with a one-sample Kolmogorov-Smirnoff (KS) test. Z is the KS test statistic, and P its significance. Not a single test remained significant after applying the conservative Holm-Bonferroni correction for multiple tests of the same null hypothesis. The variance appears to deviate more from the mean at high doses, however. N.D. indicates data were not determined for a particular replicate and dose.