ISHS Acta Horticulturae 703: II International Symposium on Sweetpotato and Cassava: Innovative Technologies for Commercialization
CHARACTERISTICS AND DIVERSITY IN SWEETPOTATO-INFECTING VIRUSES IN AFRICA |
| Authors: | V. Aritua, E. Adipala |
| Keywords: | sweetpotato chlorotic stunt crinivirus, co-infection, genetic characteristics |
| Abstract:
In Africa, seven viruses occurring singly or in combination have been identified in sweetpotato. The viruses include Sweet potato feathery mottle potyvirus (SPFMV), Sweet potato chlorotic stunt crinivirus (SPCSV), Sweet potato mild mottle ipomovirus (SPMMV), Sweet potato chlorotic fleck virus (SPCFV), Sweet potato virus II (SPVII), Sweet potato caulimo-like virus (SPCaLV) and Sweet potato virus G (SPVG). Out of these, the presence of SPFMV was detected in most countries surveyed, while SPCSV occurred in Nigeria, Gabon, Kenya, Uganda, Tanzania, Zambia, Madagascar and Egypt. SPCFV and SPMMV had limited distribution, mainly in East Africa. SPCaLV was only found in Uganda, SPVII in South Africa and SPVG in Ethiopia and Egypt. Molecular characterisation showed that most of the virus isolates have wide genetic variations, although some such as SPCSV are highly conserved. SPCSV is unique among these viruses because it has the ability to synergise others, therefore, is considered to be the most important virus responsible for the development of severe symptoms characteristic of sweetpotato virus disease, hence, it should be a major target for control. | |
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