Cassava mosaic disease (CMD) caused by the whitefly-transmitted Begomoviruses (family Geminiviridae) is a major threat to production of cassava (Manihot esculenta Crantz) in Togo. Survey was conducted in 2020 in the 5 agroecological zones of Togo to assess the status of East African cassava mosaic virus (EACMV), East African cassava mosaic Cameroon virus (EACMCMV) and its distribution. Polymerase chain reaction (PCR) and Sanger sequencing were used for the detection of cassava mosaic Begomoviruses (CMBs) in the sampled leaves. The incidence of EACMV was 47.93% (278/580) and varied between 41.30% (Zone V) and 62.29% (Zone IV) across the agroecological zone but no significant difference was observed. The EACMCMV incidence was 13.67% (38/278) and varied significantly (p ≤ 0.001) through the agroecological zone. Phylogenetic analysis of the viral isolates showed that they are closely related to those from Nigeria, Ghana, and Ivory coast. Nucleotide sequence analysis of CP revealed an overall genetic diversity (π) of around 3.4%. These results showed that EACMV was the predominant virus and that EACMCMV incidence could be more widespread in Togo.
References
[1]
McCallum, E.J., Anjanappa, R.B. and Gruissem, W. (2017) Tackling Agriculturally Relevant Diseases in the Staple Crop Cassava (Manihot esculenta). Current Opinion in Plant Biology, 38, 50-58. https://doi.org/10.1016/j.pbi.2017.04.008
[2]
FAOSTAT (2022) Statistique de l’Organisation des Nations Unies pour l’alimentation. https://www.fao.org/faostat/fr/#data/QCL
[3]
Tokunaga, H., Baba, T., Ishitani, M., Ito, K., Kim, O., Ham, L.H., et al. (2018) Sustainable Management of Invasive Cassava Pests in Vietnam, Cambodia, and Thailand. In: Kokubun, M. and Asanuma, S., Eds., Crop Production under Stressful Conditions, Springer, 131-157. https://doi.org/10.1007/978-981-10-7308-3_8
[4]
Ariyo, O.A., Koerbler, M., Dixon, A.G.O., Atiri, G.I. and Winter, S. (2005) Molecular Variability and Distribution of Cassava Mosaic Begomoviruses in Nigeria. Journal of Phytopathology, 153, 226-231. https://doi.org/10.1111/j.1439-0434.2005.00958.x
[5]
Thottappilly, G., Thresh, J.M., Calvert, L.A. and Winter, S. (2003) Cassava. In: Loebenstein, G. and Thottappilly, G., Eds., Virus and Virus-Like Diseases of Major Crops in Developing Countries, Springer, 107-165. https://doi.org/10.1007/978-94-007-0791-7_6
[6]
Calvert, L.A. and Thresh, J.M. (2001) The Viruses and Virus Diseases of Cassava. In: Hillocks, R.J. and Thresh, J.M., Eds., Cassava: Biology, Production and Utilization, CABI Publishing, 237-260. https://doi.org/10.1079/9780851995243.0237
[7]
Fondong, V.N., Pita, J.S., Rey, M.E.C., de Kochko, A., Beachy, R.N. and Fauquet, C.M. (2000) Evidence of Synergism between African Cassava Mosaic Virus and a New Double-Recombinant Geminivirus Infecting Cassava in Cameroon. Microbiology, 81, 287-297. https://doi.org/10.1099/0022-1317-81-1-287
[8]
Bull, S.E., Briddon, R.W., Sserubombwe, W.S., Ngugi, K., Markham, P.G. and Stanley, J. (2006) Genetic Diversity and Phylogeography of Cassava Mosaic Viruses in Kenya. Journal of General Virology, 87, 3053-3065. https://doi.org/10.1099/vir.0.82013-0
[9]
Otim-Nape, G., Bua, A., Thresh, J., Baguma, Y., Ogwal, S., Ssemakula, G., Acola, G., Byabakama, B., Colvin, J. and Cooter, R. (2001) The Current Pandemic of Cassava Mosaic Virus Disease in East Africa and Its Control. Natural Resources Institute.
[10]
Maruthi, M.N., Seal, S., Colvin, J., Briddon, R.W. and Bull, S.E. (2004) East African Cassava Mosaic Zanzibar Virus? A Recombinant Begomovirus Species with a Mild Phenotype. Archives of Virology, 149, 2365-2377. https://doi.org/10.1007/s00705-004-0380-1
[11]
Harimalala, M., Chiroleu, F., Giraud‐Carrier, C., Hoareau, M., Zinga, I., Randriamampianina, J.A., et al. (2014) Molecular Epidemiology of Cassava Mosaic Disease in Madagascar. Plant Pathology, 64, 501-507. https://doi.org/10.1111/ppa.12277
[12]
Patil, B.L. and Fauquet, C.M. (2009) Cassava Mosaic Geminiviruses: Actual Knowledge and Perspectives. Molecular Plant Pathology, 10, 685-701. https://doi.org/10.1111/j.1364-3703.2009.00559.x
[13]
Harrison, B.D., Swanson, M.M. and Robinson, D.J. (1995) Second International Scientific Meeting of the Cassava Biotechnology Network, Bogor, Indonesia.
[14]
Dansou-Kodjo, K.A., Mivedor, A.S., Adjata, D.K., Duclercq J., Muller E. and Gumedzoe, Y.M.D. (2017) Diagnostic de Begomovirus associes aux systèmes de cultures à base du manioc (Manihot esculenta Crantz) par la PCR (polymerase chain reaction) au Togo. Journal de la Recherche Scientifique del’Université de Lomé, 19, 73-84.
[15]
Adjata, K.D., Muller, E., Peterschmi, M., Aziadekey, M. and Gumedzoe, Y.M.D. (2010) Incidence of Cassava Viral Diseases and First Identification of East African Cassava Mosaic Virus and Indian Cassava Mosaic Virus by PCR in Cassava (manihot Esculenta Crantz) Fields in Togo. American Journal of Plant Physiology, 5, 94-101. https://doi.org/10.3923/ajpp.2010.94.101
[16]
Ogbe, F.O., Thottappilly, G., Dixon, A.G.O., Atiri, G.I. and Mignouna, H.D. (2003) Variants of East African Cassava Mosaic Virus and Its Distribution in Double Infections with African Cassava Mosaic Virus in Nigeria. Plant Disease, 87, 229-232. https://doi.org/10.1094/pdis.2003.87.3.229
[17]
Zhou, X., Robinson, D.J. and Harrison, B.D. (1998) Types of Variation in DNA-A among Isolates of East African Cassava Mosaic Virus from Kenya, Malawi and Tanzania. Journal of General Virology, 79, 2835-2840. https://doi.org/10.1099/0022-1317-79-11-2835
[18]
Sseruwagi, P., Sserubombwe, W.S., Legg, J.P., Ndunguru, J. and Thresh, J.M. (2004) Methods of Surveying the Incidence and Severity of Cassava Mosaic Disease and Whitefly Vector Populations on Cassava in Africa: A Review. Virus Research, 100, 129-142. https://doi.org/10.1016/j.virusres.2003.12.021
[19]
Kokou, K. (1998) Les mosaïques forestières au sud du Togo: Biodiversité, dynamique et activités humaines. Université de Montpellier II.
[20]
Afidegnon, D. (1999) Les mangroves et les formations associées du Sud-Est du Togo: Analyse éco-floristique et cartographie par télédétection spatiale. Université du Benin.
[21]
Pita, J.S., Fondong, V.N., Sangaré, A., Otim-Nape, G.W., Ogwal, S. and Fauquet, C.M. (2001) Recombination, Pseudorecombination and Synergism of Geminiviruses Are Determinant Keys to the Epidemic of Severe Cassava Mosaic Disease in Uganda. Journal of General Virology, 82, 655-665. https://doi.org/10.1099/0022-1317-82-3-655
[22]
Alabi, O.J., Ogbe, F.O., Bandyopadhyay, R., Dixon, A.G., Hughes, J. and Naidu, R.A. (2008) The Occurrence of African Cassava Mosaic Virus and East African Cassava Mosaic Cameroon Virus in Natural Hosts Other Than Cassava in Nigeria. Phytopathology, 97, S3-S3.
[23]
Fargette, D., Fauquet, C. and Thouvenel, J.-C. (1985) Field Studies on the Spread of African Cassava Mosaic. Annals of Applied Biology, 106, 285-294. https://doi.org/10.1111/j.1744-7348.1985.tb03118.x
[24]
Altschul, S. (1997) Gapped BLAST and PSI-BLAST: A New Generation of Protein Database Search Programs. Nucleic Acids Research, 25, 3389-3402. https://doi.org/10.1093/nar/25.17.3389
[25]
Rozas, J., Ferrer-Mata, A., Sánchez-DelBarrio, J.C., Guirao-Rico, S., Librado, P., Ramos-Onsins, S.E., et al. (2017) Dnasp 6: DNA Sequence Polymorphism Analysis of Large Data Sets. Molecular Biology and Evolution, 34, 3299-3302. https://doi.org/10.1093/molbev/msx248
[26]
Kimura, M. (1980) A Simple Method for Estimating Evolutionary Rates of Base Substitutions through Comparative Studies of Nucleotide Sequences. Journal of Molecular Evolution, 16, 111-120. https://doi.org/10.1007/bf01731581
[27]
Tamura, K., Stecher, G. and Kumar, S. (2021) MEGA11: Molecular Evolutionary Genetics Analysis Version 11. Molecular Biology and Evolution, 38, 3022-3027. https://doi.org/10.1093/molbev/msab120
[28]
Sét, A., Atass&eacu, K., Kossikouma, D. and Simon Pita, J. (2019) Identification and Incidence of Cassava Mosaic Begomoviruses in Togo. Asian Journal of Plant Pathology, 14, 11-20. https://doi.org/10.3923/ajppaj.2020.11.20
[29]
Soro, M., Tiendrebeogo, F., Pita, J.S., Traore, E.T., Some, K., Tibiri, E.B., James, B., Neya, J., Mutuku, M., Simpore, J. and Kone, D. (2021) Epidemiological Assessment of Cassava Mosaic Disease in Burkina Faso. Plant Pathology, 70, 2207-2216.
[30]
Eni, A.O., Efekemo, O.P., Onile-Ere, O.A. and Pita, J.S. (2020) South West and North Central Nigeria: Assessment of Cassava Mosaic Disease and Field Status of African Cassava Mosaic Virus and East African Cassava Mosaic Virus. Annals of Applied Biology, 178, 466-479. https://doi.org/10.1111/aab.12647
[31]
Legg, J.P. and Thresh, J.M. (2000) Cassava Mosaic Virus Disease in East Africa: A Dynamic Disease in a Changing Environment. Virus Research, 71, 135-149. https://doi.org/10.1016/s0168-1702(00)00194-5
[32]
Were, H.K., Winter, S. and Maiss, E. (2004) Occurrence and Distribution of Cassava Begomoviruses in Kenya. Annals of Applied Biology, 145, 175-184. https://doi.org/10.1111/j.1744-7348.2004.tb00373.x
[33]
Chikoti, P.C., Ndunguru, J., Melis, R., Tairo, F., Shanahan, P. and Sseruwagi, P. (2013) Cassava Mosaic Disease and Associated Viruses in Zambia: Occurrence and Distribution. International Journal of Pest Management, 59, 63-72. https://doi.org/10.1080/09670874.2012.752887
[34]
Elegba, W. (2018) Engineering Cassava Mosaic Disease (CMD) Resistance in a Ghanaian Cassava Cultivar. Doctoral Thesis, ETH Zurich.
[35]
Zinga, I., Chiroleu, F., Legg, J., Lefeuvre, P., Komba, E.K., Semballa, S., et al. (2013) Epidemiological Assessment of Cassava Mosaic Disease in Central African Republic Reveals the Importance of Mixed Viral Infection and Poor Health of Plant Cuttings. Crop Protection, 44, 6-12. https://doi.org/10.1016/j.cropro.2012.10.010
[36]
Torkpo, S.K., Offei, K., Danquah, E.Y. and Gafni, Y. (2017) Status of Cassava Mosaic Begomoviruses in Farmers’ Fields in Ghana. AIMS Agriculture and Food, 2, 279-289. https://doi.org/10.3934/agrfood.2017.3.279
[37]
Swanson, M.M. and Harrison, B.D. (1994) Properties, Relationships and Distribution of Cassava Mosaic Geminiviruses. Tropical Science, 34, 15-25.
[38]
García-Arenal, F., Fraile, A. and Malpica, J.M. (2001) Variability and Genetic Structure of Plant Virus Populations. Annual Review of Phytopathology, 39, 157-186. https://doi.org/10.1146/annurev.phyto.39.1.157
[39]
Varanda, C.M.R., Nolasco, G., Clara, M.I. and Félix, M.R. (2013) Genetic Diversity of the Coat Protein of Olive Latent Virus 1 Isolates. Archives of Virology, 159, 1351-1357. https://doi.org/10.1007/s00705-013-1953-7
[40]
Fraile, A., Malpica, J.M., Aranda, M.A., Rodríguez-Cerezo, E. and García-Arenal, F. (1996) Genetic Diversity in Tobacco Mild Green Mosaic Tobamovirus Infecting the Wild Plantnicotiana Glauca. Virology, 223, 148-155. https://doi.org/10.1006/viro.1996.0463
[41]
Rubio, L., Ayllón, M.A., Kong, P., Fernández, A., Polek, M., Guerri, J., et al. (2001) Genetic Variation of Citrus Tristeza Virus Isolates from California and Spain: Evidence for Mixed Infections and Recombination. Journal of Virology, 75, 8054-8062. https://doi.org/10.1128/jvi.75.17.8054-8062.2001
[42]
Adjata, K.D., Muller, E., Peterschmi, M., Traore, O. and Gumedzoe, Y.M.D. (2009) Molecular Evidence for the Association of a Strain of Uganda Variant of East African Cassava Mosaic Virus to Symptom Severity in Cassava (Manihot esculenta Crantz) Fields in Togo. American Journal of Biochemistry and Biotechnology, 5, 196-201. https://doi.org/10.3844/ajbbsp.2009.196.201