Serological and RT-PCR evaluation of African yam bean (Sphenostylis stenocarpa (Hochst ex. A. Rich) Harms) accessions to viral resistance under field condition

• Published in: Scientific reports 2024-04, Vol.14 (1), p.9708-8, Article 9708
• Main Authors: Jeffrey, Ihenacho, Kehinde, Iyabode, Ayo-John, Emily, Bankole, Paul, Abberton, Michael, Kumar, P. Lava, Adegboyega, Taofeek, Oyatomi, Olaniyi
• Format: Article
• Language: English
• Subjects: 631/326; 631/449; ACP ELISA; African yam bean; Beans; Cluster analysis; Comovirus - genetics; Development strategies; Disease; Disease incidence and severity; Disease Resistance - genetics; Enzyme-linked immunosorbent assay; Fabaceae - virology; Humanities and Social Sciences; Legumes; multidisciplinary; Nigeria; Pest resistance; Plant Diseases - virology; Plant Leaves - virology; Plant virus diseases; Plant viruses; Planting; Polymerase chain reaction; Potyvirus - genetics; Potyvirus - pathogenicity; Reverse Transcriptase Polymerase Chain Reaction - methods; Reverse transcription; RT-PCR; Science; Science (multidisciplinary); Seeds; Sphenostylis stenocarpa; Viral diseases; Viral infection; Viral infections; Viruses
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-024-59977-6

African yam bean (AYB) ( Sphenostylis stenocarpa (Hochst ex. A. Rich.) harms) an underutilized legume that produces nutritionally healthy seeds and tubers in some variety. The low yield of the crop is attributed to production constraints such as attacks by pest and disease-causing organisms such as fungi, bacteria and viruses. In this study, one hundred AYB accessions were evaluated for resistance to viral infection. The AYB accessions were planted using a randomized complete block design on the experimental field at the International Institute of Tropical Agriculture (IITA) Ibadan, Nigeria. Viral disease severity was assessed at 10, 12, 14, 16 and 18 weeks after planting (WAP) based on disease symptoms using disease severity index on visual scale of 1–5. Antigen–coated plate enzyme linked immunosorbent assay (ELISA) and reverse transcription polymerase chain reaction were used to index diseased leaf samples collected from the field. Result from five virus species (Cowpea mild mottle virus, Cowpea mottle virus, Southern bean mosaic virus, Cowpea mosaic virus and Bean common mosaic virus) were detected in few accessions while mixed infections were observed in some accessions. TSs-552, TSs-577, TSs-580, TSs-560 and TSs-600 were devoid of viruses and could be resistant. There were no significant differences at p