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Adaptation and stability analysis of sweet potato varieties for low-input systems in Uganda |
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| Authors: | P E Abidin F A van Eeuwijk P Stam P C Struik M Malosetti R O M Mwanga B Odongo M Hermann and E E Carey |
| Institution: | Department of Plant Sciences, Laboratory for Plant Breeding, Wageningen University, PO Box 386, 6700 AJ Wageningen, The Netherlands;;Department of Plant Sciences, Crop and Weed Ecology Group, Wageningen University, Haarweg 333, 6709 RZ Wageningen, The Netherlands;;Namulonge Agricultural and Animal Production Research Institute (NAARI), PO Box 7084, Kampala, Uganda;;International Potato Center, Apartado 1558, Lima 12, Peru;;Department of Horticulture, Forestry and Recreation Resources, Kansas State University, K-State Research and Extension Center at Olathe, 35125W, 135th St, Olathe, KS 66061, USA;;Corresponding author, E-mail: |
| Abstract: | Sixteen sweet potato varieties were evaluated for fresh storage root yield in 20 trials during 2000–2001 for three seasons in four locations in Uganda. Of the 16 varieties, 11 were developed by farmers and five by a central breeding programme. The behaviour of the varieties was quantified in terms of wide adaptation (genotypic mean across trials), specific adaptation (genotypic predictions for specific locations) and stability (Shukla stability variance). With respect to all three aspects of yield behaviour, farmer varieties performed on average better than the official varieties. The results illustrate the potential that farmer varieties can have in the improvement of sweet potato in Uganda and other regions where high diversity of sweet potato landraces exists. |
| Keywords: | Ipomoea batatas farmer varieties genotype-by-environment interaction specific adaptation stability wide adaptation |