Table 3.
Symptoms of five Solanaceae species infected with intermediate and lethal strains of PSTVd.
| Species | Cultivar | Severity and Type of Disease Symptoms | |
|---|---|---|---|
| PSTVd-Int (Intermediate) | PSTVd-AS1 (Lethal) | ||
| Capsicum annuum | Botan-kosho | − | − |
| Capsicum annuum | Takano-tsume | − | − |
| Nicotiana occidentalis | − *1 | +++++ (S, Lc, Lm, Ru, Vn, Sn) | |
| Nicotiana rustica | ++ (S, Lm) *2 | +++ (S, Lm) *2 | |
| Solanum melongena | Kurobe (F1) | − | − |
| Solanum melongena | Kurowashi (F1) | − | − |
| Solanum tuberosum | Danshaku-imo | ++++ (S, Lm, Ro) | ++++++ (S, Lm, Ru, Y, Ro, W) |
The symbols “+” and “−” indicate symptomatic and asymptomatic, respectively. The higher the number of “+”, the more severe the symptom of PSTVd. PSTVd-inoculated plants were observed until at least 6 weeks post-inoculation. Letters in parentheses mean the following symptoms: S, stunting; Lc, leaf curling (downward); Lm, leaf miniaturization; Ru, rugose; Sn, stem necrosis; Vn, vein necrosis; Y, yellowing; Ro, rosette; W, withering. *1. PSTVd-Int-infected plants were stunted when they were inoculated with an excessive amount of PSTVd RNA (10 μg/plant). *2. Poor growth was observed in PSTVd-infected plants.