Genotype by Environment on -Carotene and Yield of Yellow root Cassava

ine yellow cassava genotypes (G) 01/1224, 01/1235, 01/1368, 01/1371, 01/1412, 01/1417, 01/1442, 01/1610, 01/1663 and one white cassava were tested in 10 environments (E). The aim was to identify G that combine high yield (YLD) with high ß-carotene content (CC). In 2005 two trials were conducted in the Forest-Savannah Transition and the Deciduous Forest in RCBD. In 2006 one site (Costal Savannah) was added. Trials were harvested at 9 and 12 or 14 months after planting (MAP). Harvest data were collected for YLD and CC was determined by HPLC. Data were analyzed with MATMODEL 3.0, GGE biplot. Significant differences were found for G, E and GxE for the agronomic traits. Only the GxE of YLD was not significant. There were differences between G for CC per root, CC in root per plant and per hectare (ha) but no difference for ß carotene concentration (Bc). The best G for CC was 01/1417 followed by 01/1371 and 01/1368. The differences between E were highly significant for all ß-carotene traits. The highest values of Bc were recorded at 9 MAP. From this study 01/1368 and 01/1417 with high dry YLD and high CC were proposed for on farm and release against vitamin A deficiency in Ghana.... Mehr