Diversity of begomoviruses associated with mosaic disease of cultivated cassava (Manihot esculenta Crantz) and its wild relative (Manihot glaziovii Müll. Arg.) in Uganda

Sserubombwe, W.; Briddon, R. W.; Baguma, Yona; Ssemakula, G.; Bull, Simon E.; Bua, A.; Alicai, Titus; Omongo, Christopher; Otim-Nape, G.W.; Stanley, John

doi:10.1099/vir.0.83637-0

Cited by 21 publications

(8 citation statements)

References 43 publications

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“…EACMV was the most predominant virus followed by the strain EACMV-Ug. This slightly differs with earlier findings [16][17][18] that none of disease surveys conducted in Sub-Saharan Africa have reported the incidence of the EACMV virus suggesting that this 'wild-type' EACMV has been overtaken in nature by the more fit recombinant strains. Furthermore, since EACMV-Ug was first reported in Uganda in late 1980s, it has spread to affect nine countries in East and Central Africa [19,20]).…”

Section: Discussioncontrasting

confidence: 99%

Occurrence and Distribution of Begomoviruses Infecting Cassava in Western Kenya

Were¹

2016

PLANT

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Section: Discussioncontrasting

confidence: 99%

Occurrence and Distribution of Begomoviruses Infecting Cassava in Western Kenya

Were¹

2016

PLANT

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“…Thus, CMGs can be classified into two major groups based on their host range: ACMV, ICMV and SLCMV forming one class infecting all species of Nicotiana in addition to cassava, although with different levels of virulence, and EACMV‐like viruses and SACMV in another class, which infects only N. benthamiana and cassava. Recently, there has been a report of an association of ACMV and EACMV‐Ug with Manihot glaziovii, a wild species of cassava, which has been used as a source of resistance in CMD breeding programmes (Sserubombwe et al. , 2008).…”

Section: Plant Host Range Of Cassava Mosaic Geminivirusesmentioning

confidence: 99%

Cassava mosaic geminiviruses: actual knowledge and perspectives

Patil

Fauquet²

2009

Molecular Plant Pathology

234

168

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SUMMARY Cassava mosaic disease (CMD) caused by cassava mosaic geminiviruses (CMGs) is one of the most devastating crop diseases and a major constraint for cassava cultivation. CMD has been reported only from the African continent and Indian subcontinent despite the large-scale cultivation of cassava in Latin America and several South-East Asian countries. Seven CMG species have been reported from Africa and two from the Indian subcontinent and, in addition, several strains have been recognized. Recombination and pseudo-recombination between CMGs give rise not only to different strains, but also to members of novel virus species with increased virulence and a new source of biodiversity, causing severe disease epidemics. CMGs are known to trigger gene silencing in plants and, in order to counteract this natural host defence, geminiviruses have evolved suppressor proteins. Temperature and other environmental factors can affect silencing and suppression, and thus modulate the symptoms. In the case of mixed infections of two or more CMGs, there is a possibility for a synergistic interaction as a result of the presence of differential and combinatorial suppressor proteins. In this article, we provide the status of recent research findings with regard to the CMD complex, present the molecular biology knowledge of CMGs with reference to other geminiviruses, and highlight the mechanisms by which CMGs have exploited nature to their advantage.

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“…Viruses with a single-stranded DNA (ssDNA) genome depend for replication exclusively on host DNA polymerases yet exhibit a degree of sequence variability similar to that of RNA viruses (26,52,65,66). ssDNA plant virus variability and rapid sequence evolution were documented for geminiviruses with monopartite and bipartite genomes (7,16,17,34,40,42,68,71). The polymerases that replicate ssDNA plant virus genomes are not known; hence, their respective contributions to the sequence diversity of this virus group remain elusive.…”

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confidence: 99%

High Variability and Rapid Evolution of a Nanovirus

Grigoras

Timchenko

Grande-Pérez

et al. 2010

J Virol

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Nanoviruses are multipartite single-stranded DNA (ssDNA) plant viruses that cause important diseases of leguminous crops and banana. Little has been known about the variability and molecular evolution of these viruses. Here we report on the variability of faba bean necrotic stunt virus (FBNSV), a nanovirus from Ethiopia. We found mutation frequencies of 7.52 ؋ 10 ؊4 substitutions per nucleotide in a field population of the virus and 5.07 ؋ 10 ؊4 substitutions per nucleotide in a laboratory-maintained population derived thereof. Based on virus propagation for a period of more than 2 years, we determined a nucleotide substitution rate of 1.78 ؋ 10 ؊3 substitutions per nucleotide per year. This high molecular evolution rate places FBNSV, as a representative of the family Nanoviridae, among the fastest-evolving ssDNA viruses infecting plants or vertebrates.

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Diversity of begomoviruses associated with mosaic disease of cultivated cassava (Manihot esculenta Crantz) and its wild relative (Manihot glaziovii Müll. Arg.) in Uganda

Abstract: Diversity of begomoviruses associated with mosaic disease of cultivated cassava (Manihot esculenta Crantz) and its wild relative (Manihot glaziovii Mü ll. Arg.) in Uganda

Cited by 21 publications

References 43 publications

Occurrence and Distribution of Begomoviruses Infecting Cassava in Western Kenya

Occurrence and Distribution of Begomoviruses Infecting Cassava in Western Kenya

Cassava mosaic geminiviruses: actual knowledge and perspectives

High Variability and Rapid Evolution of a Nanovirus

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