Dilution factor Lesions number in primary leaf Systemic necrosis (d p.i.)‡ 1:500 Full necrosis 6-8 1:5000 80-100 6-8 1:50000 20-30 6-8 1:500000 2-5 6-10 1:5000000 1* 7-11

*Plants with a single lesion were used in the analyses.

‡Data represents average of three consequtive experiments with 10 plants in each experiment.

Table 1: Effect of infection sites (lesion number) on systemic movement of Tobacco mosaic virus in Nicotiana megalosiphon.