Invasive Species Compendium

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Abstract

Konjak mosaic virus, a new potyvirus infecting konjak, Amorphophallus konjac.

Abstract

Of 2 potyviruses from A. konjac plants showing mosaic symptoms in Gunma Prefecture in Japan in 1986, one was identified as dasheen mosaic potyvirus while the other differed in host range, symptoms on Philodendron selloum and serological properties. Out of 17 spp. in 5 families tested by sap inoculation with the latter virus, only 3 spp. in the Araceae were infected, suggesting a narrow host range. Infectivity was retained after dilution up to 10-2 but not at 10-3, heating for 10 min at 55°C but not 60° and storage at room temp. for 2 d but not 4 d. The virus was transmitted through the corm of A. konjac and also by Aphis gossypii. Filamentous virus particles, c. 800 nm long were detected in crude sap of infected P. selloum. The virus was serologically distinguished from DasMV in double-antibody sandwich ELISA, immunodiffusion tests and immunoelectron microscopy. It was concluded to be a new member of the potyvirus group and designated as konjak mosaic virus. KMV was detected from naturally infected aroid plants, with the exception of Arisaema serratum and Colocasia esculenta.