Evaluation of Four Varieties of Sweetpotato (<i>Ipomeoa Batatas</i> (L.) Lam) under Different Sources of Planting Material for Field Performance and Viral Load — Oak Academic Publishing
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Evaluation of Four Varieties of Sweetpotato (<i>Ipomeoa Batatas</i> (L.) Lam) under Different Sources of Planting Material for Field Performance and Viral Load
Crop Science Department, University for Development Studies, Tamale, Ghana
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Crop Science Department, University for Development Studies, Tamale, Ghana
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International Potato Centre, Nyankpala Office, Tamale, Ghana
1 Crop Science Department, University for Development Studies, Tamale, Ghana
2 Crop Science Department, University for Development Studies, Tamale, Ghana
3 International Potato Centre, Nyankpala Office, Tamale, Ghana
Sweetpotato is an important crop for food security in many developing countries which is cultivated using vine cuttings. Studies have revealed that there are at least fifteen well characterized viruses known to infect sweetpotato of which 10 are economically important that contribute to yield reduction. Planting materials use by farmers are often infected by one or more of these viruses. The aim of this study was to evaluate three different sources of planting materials of different health status for their field performance and virus presence. The sources of planting materials were in vitro generated platelets, symptomless Field materials and Farmer’s materials. Four sweetpotato varieties Apomuden, Bohye, Ligri and Dadanyuie were selected from each source of planting material. The trial was laid in a split plot design with the sources of planting material allocated to main plots and the varieties to sub-plots. The plantlets of the four varieties were planted at Botanga Irrigation Scheme in Northern region of Ghana. Viral symptom scores were taken twice, score 1 being the average from 4 - 7 weeks after planting (WAP) and score 2 being the average from 8 - 11 WAP. Nitrocellulose Membranes Enzyme Linked Immunosorbent Assay (NCM-ELISA) kits were employed for the detection of sweetpotato viruses on the field. The source of planting materials significantly influenced ( P < 0.05) virus field visual observation. In vitro generated material showed the least symptoms of virus followed by Field materials. Apomuden and Bohye varieties recorded the highest virus score in the first and second virus symptom observational score respectively. NCM-ELISA revealed that the viruses SPFMV, SPMMV, SPMSV, SPCFV, SPCSV, and CMV were significantly present among the different sources of planting materials. In vitro , Field and Farmer materials recorded NCM-ELISA score of 0.225, 1.075 and 1.500 respectively. Apomuden variety recorded the highest virus score in the assay. Vine and root yield was higher among the in vitro generated material. Farmers should use laboratory cleaned material however, in the absence of such material they should select field material showing no symptom of virus.
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