Diversity of Yam (Dioscorea spp.) Populations in South Western Region of Cameroon
American Journal of Life Sciences
Volume 4, Issue 6, December 2016, Pages: 187-194
Received: Nov. 15, 2016; Accepted: Nov. 28, 2016; Published: Jan. 6, 2017
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Joseph Ako Oben, Department of Botany and Plant Physiology, University of Buea, Buea, Cameroon
Andrew Enow Egbe, Department of Botany and Plant Physiology, University of Buea, Buea, Cameroon
George Bindeh Chuyong, Department of Botany and Plant Physiology, University of Buea, Buea, Cameroon
Pascal Tabi Tabot, Department of Agriculture, Higher Technical Teachers Training College Kumba, University of Buea, Buea, Cameroon
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Yams are Dioscoreaceae grown in the tropics and sub-tropics and used as food and for related pharmaceutical properties. The South Western Region of Cameroon is a major yam producing zone. This study which evaluates morphological variability between ten linguistically different yam types grown in South Western Cameroon will serve as a necessary step for subsequent genetic study of the species. The yams, collected from nine sites, were planted in a completely randomized design in four locations. Analysis of data on nine morphological vines traits reveals that, the yam types constituted five main clusters. Cluster 1 with 61.3% similarity consists of five accessions of D. rotundata - Ikom, Calabar, White, Agar and Igbo yams. This cluster has three sub-groups with 84.9% similarity. Cluster 2 consists of Yellow yam (D. cayenensis) with 48.5% similarity to members of Cluster 1. Ghana Water yam and Swệt yam constitute Cluster 3 with 83.4% similarity while Sugar yam and Water yam constitute the 4th and 5th clusters respectively. The ten yam types are actually five cultigens –rotundata, rotundata-cayenensis complex, cayenensis, dumetorum and alata; and the significant variability (P<0.05) observed with respect to the morphological characters evaluated may be the basis for the linguistic polymorphism noticed in the naming of the different yam types. Although genetic analysis is recommended to determine firm similarities, the establishment of clear links remains problematic because of the high hybridisation noticed among members of the Dioscoreaceae; and considering that yams types were introduced in the zone from different lands over many centuries.
Dioscoreaceae, Clusters, Linguistic Polymorphism, Similarities, Morphometric Analysis
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Joseph Ako Oben, Andrew Enow Egbe, George Bindeh Chuyong, Pascal Tabi Tabot, Diversity of Yam (Dioscorea spp.) Populations in South Western Region of Cameroon, American Journal of Life Sciences. Vol. 4, No. 6, 2016, pp. 187-194. doi: 10.11648/j.ajls.20160406.17
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