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Advances in Agriculture
Volume 2016, Article ID 2658983, 7 pages
http://dx.doi.org/10.1155/2016/2658983
Research Article

Influence of Cultivar on the Postharvest Hardening of Trifoliate Yam (Dioscorea dumetorum) Tubers

1Department of Plant Biology, Faculty of Science, University of Yaounde 1, P.O. Box 812, Yaounde, Cameroon
2Centre for Food and Nutrition Research, IMPM, P.O. Box 6163, Yaounde, Cameroon
3Institute of Agricultural Research for Development (IRAD), P.O. Box 2067, Yaounde, Cameroon
4Appropriate Development for Africa Foundation (ADAF)/“Ferme Ecole de Baham” (FEBO), P.O. Box 11646, Yaounde, Cameroon

Received 31 March 2016; Revised 20 May 2016; Accepted 31 May 2016

Academic Editor: Claus A. Soerensen

Copyright © 2016 Christian Siadjeu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The influence of cultivar on the postharvest hardening of Dioscorea dumetorum tubers was assessed. 32 cultivars of D. dumetorum tubers were planted in April 2014, harvested at physiological maturity, and stored under prevailing tropical ambient conditions (19–28°C, 60–85% RH) for 0, 5, 14, 21, and 28 days. Samples were evaluated for cooked hardness. Results showed that one cultivar, Ibo sweet 3, was not affected by the hardening phenomenon. The remaining 31 were all subject to the hardening phenomenon at different degree. Cooked hardness increased more rapidly in cultivars with many roots on the tuber surface compared to cultivars with few roots on the tuber surface. When both the characteristics flesh colour and number of roots on tuber surface were associated, cooked hardness in cultivars with yellow flesh and many roots increased more rapidly than in cultivars with white flesh and many roots, whereas cooked hardness in cultivars with yellow flesh and few roots increased more slowly than in cultivars with white flesh and few roots. Accessions collected in high altitude increased more rapidly compared to accessions collected in low altitude. The cultivar Ibo sweet 3 identified in this study could provide important information for breeding program of D. dumetorum against postharvest hardening phenomenon.