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
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.
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.
Simpson M. G. Plant systematic. Elsevier, Amsterdam. 2006, 590 pp.
Caddick L. R., Rudall P. J., Wilkin P., Hedderson T. A. J. and Chase M. W. Phylogenetics of Dioscoreales based on combined analyses of morphological and molecular data. Botanical Journal of the Linnean Society. Vol. 138 (2): 2002a, pp123-144.
Yadav U., Ram C. P., Krishna K. S., Sangeeta R., Narendra N. T., Uttam B. S. and Hugo A. Diversity of use and local knowledge of wild edible plant resources in Nepal. Journal of Ethnobiology and Ethnomedicine. Vol. 8 (16), 2012, pp1-39.
APG III. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III. Botanical Journal of the Linnean Society. Vol. 161, 2009, pp 105-121.
Chiranjibi P., Reddy C. S. and Pattanaik C. R. Conservation and utilisation of wild tubers by tribal people in Orissa, India. Conference Paper. International Society of Tropical Root Crops, Thiruvananthapuram India. May 07, 2014.
Ngo-Ngwe M. F. S., Omokolo D. N and Joly S. Evolution and Phylogenetic diversity of yam species (Dioscorea spp.): Implication for Conservation and Agricultural Practices. PLos One, 10 (12), 2015, pp 1-12.
Wilkin P., Rajoanah M. T., Jeannoda Vo., Hladik A., Jeannoda Vi and Hladik C. M. An endanger new species of edible yam (Dioscorea, Dioscoreaceae) from Western Madagascar. Kew Bulletin. Vol. 63, 2008, pp 113-120.
Coursey D. G. Yams. Longmans Green and Co. London. 1967. 230 pp.
Williams C. N., Chew W. Y. and Rajaratnam J. A. Tree and Field Crops of the Wetter Regions of the Tropics. Intermediate Tropical Agriculture Series. Longman Group Ltd. Essex, England. 1987. 262 pp.
Burkil, I. H. The organography and the evolution of the Dioscoreaceae, the family of Yams. Botanical Journal of Linnaean Society. Vol. 56, 1960, pp 319-412.
Degras, L. M. The Yam: A Tropical Crop. In Tropical Root and Tuber Crops: Cassava, Sweet Potato, Yams and Aroids. Lebot, V. (ed.). Macmillan, London. 1993, 433 pp.
FAO. FAOSTAT Agriculture Data. Food and Agriculture Organisation of the United Nations. Rome, Italy. 2007.
Dumont R., Hamon P. and Seignobos C. Les ignames au Cameroun. CIRAD – CA. Repères – Cultures annuelles.1994, 80 pp.
Tindo J. M., Zapfack L. and Sonké B. Diversity of wild yams (Dioscorea spp., Dioscoreaceae) collected in continental Africa. Biodiversity and Conservation. Vol. 25 (1), 2015.
INS. Annuaire Statistique du Cameroon. Institute National de la Statistque. Yaounde, Cameroon. 2010, 192pp.
National Geographic Centre, Ministry of Scientific Research, Yaounde. 1984.
Cameroon Third Population and Housing Census. Ministère de Plan et D’Aménagement de Territoire, Yaounde. 2010.
Ayonge S. N. A quantitative evaluation of global warming and precipitation in Cameroon from 1930 to 1995 and projections to 2060: Effects on environment and water resources. In Lambi, C. M. (ed.), Environmental Issues: Problems and Prospects. Unique Printers. Bamenda, 2001, pp 142-155.
IPGRI/IITA. Descriptors for Yam (Dioscorea spp.). International Institute of Tropical Agriculture, Ibadan Nigeria.1997, 66 pp.
Lebot V., Trilles B., Noyer J. L. and Modesto J. Genetic relationship between Dioscorea alata L. Cultivars. Genetic Resources and Crop Evolution. Vol. 45, 1998, pp 499-509.
Bourret D. 1973. Etude ethnobotanique des Dioscoreaceae alimentaires. Thèse de doctorat, Faculté des Sciences, Paris, France. 135 pp.
Velayudhan K. C., Muralidharan V. K., Amalraj V. A., Thomas T. A. and Soudhamini P. Studies on the morphotypic variability, distribution and genetic divergence in an indigenous collection of greater yam (Dioscorea alata L.). Journal of Root Crops. Vol. 15 (2), 1989, pp 79-89.
Akoroda A. M. Principal component analysis and metrograph of variation among Nigerian yellow yams. Euphytica. Vol. 32, 1983, pp 565-573.
Onyilagha, J. C. Numerical analysis of variation among Nigerian Dioscorea rotundata accessions. Euphytica. Vol. 35 (2), 1986, pp 413–419.
Mwirigi P. N., Kahangi E. M., Nyende A. B., Mamati E. G. Morphological Variability within the Kenyan yam (Dioscorea spp.). Journal of Applied Biosciences. Vol. 16, 2009, pp 894-901.
Muthamia Z. K., Morage F. E., Nyende A. B., Mamati E. G. and Wanjala B. W. Estimation of the genetic diversity of the Kenyan yam (Dioscorea spp.) using microsatellite markers. African Journal of Biotecnology. Vol. 12 (40), 2013, pp 5845-5841.
Mignouna H. D., Dansi A. and Zok S. Morphological and isozymic diversity of the cultivated yams (Dioscorea cayenensis/Dioscorea rotundata complex) of Cameroon. Genetic Resources and Crop Evolution. Vol. 49, 2002, pp 21–29.