Viral Genetics: Assessing Diversity And Phylogenetic Connections Among Yam Pathogens In Nigeria
Fatima Ibrahim Abdullahi
Department of Crop Protection, Faculty of Agriculture, University of Abuja, Abuja, Nigeria
Ahmed Musa Bello
Department of Crop Protection, Faculty of Agriculture, Ahmadu Bello University, Zaria, Nigeria
Abstract
Yam (Dioscorea spp.) holds immense agricultural significance in sub-Saharan Africa, particularly in Nigeria, where it stands as the primary root crop in terms of cultivation area, production volume, and economic value. However, yam cultivation faces persistent challenges attributed to pest-related yield losses, including insects, diseases, and weeds. Among these obstacles, viral diseases have emerged as a substantial concern due to their detrimental impact on yam propagation. The primary mode of yam multiplication involves vegetative planting of cuttings or tuber pieces (setts), resulting in the accumulation and transmission of viral diseases. Various viral pathogens from the Potyvirus, Potexvirus, Badnavirus, Cucumovirus, and Caviavirus genera infect yam species, inducing symptoms such as mosaic patterns, chlorosis, stunting, and distortion. Of particular importance in sub-Saharan Africa is the Yam mosaic virus (YMV) within the Potyvirus genus. This abstract highlight the prevalence and consequences of viral infections in yam cultivation, especially in regions responsible for over 90% of global yam production. It underscores the need to address the epidemiology and control of yam viruses, emphasizing the role of uncontrolled introduction of infected yam germplasm in spreading these pathogens. Understanding and managing viral diseases are crucial steps toward ensuring the sustainability and productivity of yam farming in sub-Saharan Africa