Abstract
Abstract To determine the effects of sweet potato feathery mottle virus (SPFMV), Sweet potato chlorotic stunt virus (SPCSV) and their co-infection on sweet potato yield, twelve sweet potato varieties were assessed in a hotspot area in Western Burkina Faso. The experiment was carried out in a randomized complete-block design with the twelve varieties in three replications. Data were collected on plant growth parameters, plant virus symptoms and yield parameters. Additional testing for selected sweet potato viruses was done using a nitrocellulose membrane enzyme-linked immunosorbent assay (NCM-ELISA) and RT-PCR. SPFMV and SPCSV were the viruses detected in this study. Varieties Djakani and Ligri were virus-free and had the highest average yields out of twelve sweet potato varieties assessed. Field monitoring indicated that 58% of plants were found to be virus-infected. The results suggest that severe symptoms were associated with sweet potato virus disease (SPVD) and yield reduction. However, the interaction of SPCSV with other viruses, which may result in synergistic negative effects on sweet potato yield and quality, needs further research.
Highlights
Sweet potato (Ipomoea batatas) is cultivated and consumed in many tropical and sub-tropical regions, including several countries in Africa (Rey et al 2012)
Storage root yield was far lower compared to those reported by Some et al (2015) on the same station where the yield average was 13.19t/ha and those from Ghana (11.8t/ha) (Abidin et al 2017) using four varieties
Our study represents the first identification of sweet potato viruses in Burkina Faso and the assessment of their effect on storage root yield
Summary
Sweet potato (Ipomoea batatas) is cultivated and consumed in many tropical and sub-tropical regions, including several countries in Africa (Rey et al 2012). In Sub-Saharan Africa, sweet potato is the third most important root and tuber crop after cassava (Manihot esculenta) and yam (Dioscorea spp.) (FAOSTAT 2018). Sweet potato is an important food crop and the orange-fleshed sweet potato (OFSP) has the potential to address malnutrition and vitamin A deficiency among children under five and lactating women populations. Because sweet potato is vegetatively propagated (by taking cuttings directly from a previous crop or from sprouted tubers), it is prone to the accumulation of viruses and other pathogens (Souto et al 2003; Cuellar et al 2015)
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