Abstract
Abstract The troptophan content was determined in 29 cultivars of tropical root and tuber crops: (Manihot esculenta Crantz, Dioscorea alata L., D. rotundata Poir., D. esculenta Burkill, D. bulbifera L., D. trifida L., Ipomea batatas L., Xanthosoma sagittifolium L. Schott, Colocasia esculenta L. Schott, Canna edulis Ker., Maranta arundinacea L., and Calathea allouia Lindl.) They contained 0.1 to 1.1 g tryptophan per 100 g protein and were below the FAO reference protein. Sufficient diversity existed between cultivars for troptophan per g of dried tissue to recommend further trials with D. alata cv. Florido, D. esculenta cv. Spindle, X. sagittifolium cv. Aguadillana and Colocasia esculenta cv. Martin. These contained 50% to 79% as much tryptophan as the FAO reference protein and have excellent cooking qualities.
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