Reported as only affecting sweetpotato in Asia
and Africa. Crop losses are unknown.
SwPLV
has been reported from Asia [China (Guandong, Taiwan), Japan] and Africa [Kenya
and Uganda].
It has also been found in Peru, Indonesia,
Philippines, Egypt and India but no published reports are available.
Most sweetpotato cultivars are infected without
showing any symptom (latent), but occasionally a transient mild chlorosis may
develop.
This virus produces cytoplasmic inclusions
(pinwheels) characteristic of the genus Potyvirus. SwPLV has been found to
be serologically related (using PTY-1 antibodies) to typical aphid-transmitted
members of the potyvirus group and to share other epitopes with SPFMV. Some
strains are transmitted by the aphid Myzus
persicae. Coat protein and 3’ non-coding region sequence data provides
evidence for the assignment of SwPLV to the genus Potyvirus.
It is transmitted by mechanical inoculation and
by grafting, but not by contact between plants or by seed.
The only known natural host of SwPLV is Ipomoea
batatas. No secondary host has been reported naturally.
In the laboratory, SwPLV infects 14 of 36
species in the families Chenopodiaceae, Solanaceae and Convolvulaceae. The
following species are susceptible: Chenopodium
murale, C. amaranticolor, C. quinoa, Nicotiana clevelandii, N. debneyii, N.
megalosiphon, N. rependa, N. tabacum, N. benthamiana, Ipomoea nil, I. setosa.
Regulatory
control
International exchange of virus-free germplasm.
Cultural
control
Use of clean, healthy planting materials.
Brunt, A.A., Crabtree, K., Dallwitz, M.J., Gibbs, A.J., Watson, L. and
Zurcher, E.J. (eds.) (1996 onwards). `Plant Viruses Online: Descriptions and
Lists from the VIDE Database. Version: 20th August 1996.' URL
http://biology.anu.edu.au/Groups/MES/vide/
Chung, M.L., Hsu, Y.H.,
Chen, M.J., and Chiu, R.J. 1986. Virus diseases of sweetpotato in Taiwan. Pages
84-90 in: Plant Virus Diseases of Horticultural Crops in the Tropics and
Subtropics. FFTC Book Series 33, Food and Fertilizer Technology Center for the
Asian and Pacific Region, Taipei, Taiwan, Republic of China.
Colinet, D., Kummert, J., and Lepoivre, P. 1997. Evidence for the assignment of two strains of SPLV to
the genus Potyvirus based on coat
protein and 3’ non-coding region sequence data. Virus Research, 49: 91-100.
Colinet, D., Nguyen,
M., Kummert, J., Lepoivre, P., and Xia, F.Z. 1998. Differentiation among
potyviruses infecting sweetpotato based on genus- and virus specific reverse
transcription polymerase chain reaction. Plant disease, 82: 223-229.
Hammond, J., Jordan,
R.L., Larsen, R.C., Moye,r J.W. 1992. Use of polyclonal and monoclonal
antibodies to examine serological relationship among three filamentous viruses
of sweetpotato. Phytopathology, 82:713-717.
Liao, C.H., Chien, I.C.,
Chung, M.L., Chiu, R.J., Han, Y.H. 1979. A study of sweetpotato virus disease in
Taiwan. I. Yellow spot virus. Journal of Agricultural Research of China,
28:127-137.
Usugi, T.,
Nakano, M., Shinkai, A., and Hayashi, T. 1991. Three filamentous viruses
isolated from sweetpotato in Japan. Ann. Phytopathol. Soc. Japan 57: 512-521.
Contributed by: Segundo
Fuentes and Luis
Salazar
