1992 Volume 58 Issue 5 Pages 706-712
In 1986, two potyviruses were detected from konjak plants (Amorphophallus konjac) showing mosaic symptoms in Gunma Prefecture, in Japan. One was identified as dasheen mosaic virus (DasMV), and the other was found different from DasMV in host range, symptom induction on Philodendron selloum, and serological properties. Out of 17 species in five families tested for susceptibility by sap inoculation, only three species in Araceae were infected by the virus, suggesting a narrow host range of the virus. The virus was infective when diluted up to 10-2 but not at 10-3, after heating for 10min at 55°C but not 60°C and storing for 2 days but not 4 days at room temperature. The virus was transmitted through corm of konjak and also by aphid, Aphis gossypi. Filamentous virus particles of about 800nm in length were detected in crude sap of infected P. selloum. The virus was serologically distinguished from DasMV, as far as investigated by double antibody sandwich-ELISA, immunodiffusion test and immunoelectron microscopy. The virus was concluded to be a new member of the potyvirus group, and was designated as konjak mosaic virus (KMV). KMV was detected from aroid plants, except Arisaema serratum and Colocasia esculenta, which were naturally infected.