scholarly journals Recombination and selection pressure in the ipomovirus sweet potato mild mottle virus (Potyviridae) in wild species and cultivated sweetpotato in the centre of evolution in East Africa

2009 ◽  
Vol 91 (4) ◽  
pp. 1092-1108 ◽  
Author(s):  
A. K. Tugume ◽  
S. B. Mukasa ◽  
N. Kalkkinen ◽  
J. P. T. Valkonen
Keyword(s):  
East Africa ◽  
Sweet Potato ◽  
Wild Species ◽  
Selection Pressure ◽  
Mottle Virus

scholarly journals Genomic analysis of Sweet potato feathery mottle virus from East Africa

2020 ◽  
Vol 110 ◽  
pp. 101473 ◽  
Author(s):  
Godfrey Wokorach ◽  
Geoffrey Otim ◽  
Joyce Njuguna ◽  
Hilary Edema ◽  
Vincent Njung'e ◽  
...  
Keyword(s):  
East Africa ◽  
Sweet Potato ◽  
Genomic Analysis ◽  
Mottle Virus

The ability of cultivars of sweetpotato in East Africa to ‘revert’ from Sweet potato feathery mottle virus infection

2014 ◽  
Vol 186 ◽  
pp. 130-134 ◽  
Author(s):  
Richard W. Gibson ◽  
Peter Wasswa ◽  
Hale A. Tufan
Keyword(s):  
Virus Infection ◽  
East Africa ◽  
Sweet Potato ◽  
Mottle Virus

scholarly journals Natural Wild Hosts of Sweet potato feathery mottle virus Show Spatial Differences in Virus Incidence and Virus-Like Diseases in Uganda

2008 ◽  
Vol 98 (6) ◽  
pp. 640-652 ◽  
Author(s):  
A. K. Tugume ◽  
S. B. Mukasa ◽  
J. P. T. Valkonen
Keyword(s):  
East Africa ◽  
Sweet Potato ◽  
Virus Disease ◽  
Mottle Virus ◽  
Wild Plants ◽  
East African ◽  
Virus Incidence ◽  
Close Proximity ◽  
Natural Hosts ◽  
Spatial Differences

Sweet potato feathery mottle virus (SPFMV, genus Potyvirus) is globally the most common pathogen of sweetpotato. An East African strain of SPFMV incites the severe ‘sweetpotato virus disease’ in plants co-infected with Sweet potato chlorotic stunt virus and threatens subsistence sweetpotato production in East Africa; however, little is known about its natural hosts and ecology. In all, 2,864 wild plants growing in sweetpotato fields or in their close proximity in Uganda were observed for virus-like symptoms and tested for SPFMV in two surveys (2004 and 2007). SPFMV was detected at different incidence in 22 Ipomoea spp., Hewittia sublobata, and Lepistemon owariensis, of which 19 species are new hosts for SPFMV. Among the SPFMV-positive plants, ≈60% displayed virus-like symptoms. Although SPFMV incidence was similar in annual and perennial species, virus-like diseases were more common in annuals than perennials. Virus-like diseases and SPFMV were more common in the eastern agroecological zone than the western, central, and northern zones, which contrasted with known incidence of SPFMV in sweetpotato crops. The data on a large number of new natural hosts of SPFMV detected in this study provide novel insights into the ecology of SPFMV in East Africa.

scholarly journals SWEETPOTATO VIRUS DISEASES RESEARCH IN EAST AFRICA

HortScience ◽  
2006 ◽  
Vol 41 (3) ◽  
pp. 517B-517
Author(s):  
D.W. Miano ◽  
D. R. LaBonte ◽  
C. A. Clark
Keyword(s):  
East Africa ◽  
Sweet Potato ◽  
Virus Disease ◽  
Lake Victoria ◽  
Virus Detection ◽  
Sub Saharan Africa ◽  
Mottle Virus ◽  
Virus Infections ◽  
Detection Techniques ◽  
Sub Saharan

Sweetpotato is an important staple food crop in Sub-Saharan Africa, with production being concentrated in East Africa, particularly around Lake Victoria. Productivity of the crop is greatly constrained by viral diseases. Four main viruses have consistently been detected from various surveys done in the region viz. sweet potato feathery mottle virus (SPFMV), sweet potato chlorotic stunt virus (SPCSV), sweet potato mild mottle virus (SPMMV), and sweet potato chlorotic fleck virus (SPCFV). Sweet potato caulimo-like virus (SPCaLV), sweet potato latent virus (SPLV), and cucumber mosaic virus (CMV) have also been detected though only in isolated cases. The most severe symptoms have been caused by co-infection with SPCSV and SPFMV, resulting in the synergistic Sweet potato virus disease (SPVD). Yield reductions due to virus infections have been estimated to be >90% in very severe cases. Virus detection has mainly been limited to the use of serological methods. Some plants have been observed with symptoms resembling those caused by viruses, but do not react with available antisera, indicating that the plants could be infected with viruses that have not been described, or not tested in the region. Use of other detection techniques such as PCR may result in identification of more viruses in the region. This report gives a summary of our research efforts towards detection of other viruses present in the region, and identification of resistant germplasm.

scholarly journals Incidence and distribution of Sweetpotato viruses and their implication on sweetpotato seed system in Malawi

2021 ◽  
Author(s):  
Willard Mbewe ◽  
Andrew Mtonga ◽  
Margret Chiipanthenga ◽  
Kennedy Masamba ◽  
Gloria Chitedze ◽  
...  
Keyword(s):  
Sweet Potato ◽  
Virus Disease ◽  
Disease Incidence ◽  
Mottle Virus ◽  
Enzyme Linked Immunosorbent Assay ◽  
Foliar Symptoms ◽  
Membrane Enzyme ◽  
Sweet Potato Virus ◽  
Seed System ◽  
Clean Seed

AbstractA survey was carried out in 19 districts to investigate the prevalence and distribution of sweetpotato virus disease (SPVD) and its implication on the sustainability of clean seed system in Malawi. A total of 166 leaf samples were collected and tested for the presence of 8 viruses using nitrocellulose membrane enzyme-linked immunosorbent assay (NCM-ELISA). SPVD foliar symptoms were observed in 68.42% of the surveyed districts. There were significant variations in disease incidence and severity (p < 0.001) among districts, with the highest incidence in Mulanje (28.34%). Average SPVD severity score was 3.05. NCM-ELISA detected sweet potato feathery mottle virus (SPFMV, 30.54%), sweet potato mild mottle virus (SPMMV, 31.14%), sweet potato mild speckling virus (SPMSV, 16.17%), sweet potato C-6 virus (SPC6V, 13.77%), sweet potato chlorotic stunt virus (SPCSV, 22.16%), sweet potato collusive virus (SPCV, 30.54%), sweet potato virus G (SPVG, 11.38%), cucumber mosaic virus (CMV, 7.78%) either in single or mixed infections. Data from this study indicate a significant SPVD occurrence in the country, and the consequence implications towards national sweetpotato seed system.

scholarly journals Genetic Diversity of Sweet potato feathery mottle virus from Sweet Potatoes in Korea

2007 ◽  
Vol 23 (1) ◽  
pp. 13-21 ◽  
Author(s):  
Hae-Ryun Kwak ◽  
Mi-Kyeong Kim ◽  
Mi-Nam Jung ◽  
Su-Heon Lee ◽  
Jin-Woo Park ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Sweet Potato ◽  
Mottle Virus ◽  
Sweet Potatoes

scholarly journals Synthetic hexaploids derived from wild species related to sweet potato.

1987 ◽  
Vol 37 (4) ◽  
pp. 367-376 ◽  
Author(s):  
Itaru SHIOTANI ◽  
Tsuneo KAWASE
Keyword(s):  
Sweet Potato ◽  
Wild Species ◽  
Synthetic Hexaploids
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