1. Department of Agronomy, Faculty of Agriculture, Khon Kaen University, Khon Kaen, Thailand;
2. Peanut and Jerusalem Artichoke and Cassava Improvement Research Group, Khon Kaen University, Khon Kaen, Thailand;
3. Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen, Thailand;
4. Crop Genetics and Breeding Research Unit, USDA-ARS, Tifton, Georgia, USA;
5. Department of Crop & Soil Sciences, University of Georgia, Tifton, Georgia, USA