• V. I. ALAJE Forestry Research Institute of Nigeria, P.M.B. 5054, Ibadan, Oyo State
  • C. O. ALAKE Federal University of Agriculture, Abeokuta, Ogun State
Keywords: Accessions, Genotypic correlation, genetic variation, Principal Component Analysis, Phenotypic correlation, Dacryodes eduli,s


African pear fruit (Dacryodes edulis) is a highly sought for multipurpose agroforestry tree species that has the potential for both local and international trades, Nigeria is among the leading producer of the fruit, but its pattern and extent of its genetic variability is currently unknown. Hence, a study was carried out to determine the pattern and extent of genetic variability and interrelationships among 13 morphological traits of African pear fruit accessions. The experiment was laid in a Completely Randomized Design in 5 replications. Data collected on number of leaf production, leaf length,  leaf breadth,  leaf length/breadth ratio,  internode distances, plant height, collar diameter, fresh leaf weight, fresh stem weight, fresh root weight, dry leaf weight, dry stem weight, dry root weight and  biomass accumulation were subjected to Analysis of Variance. Treatment means were separated using Duncan’s Multiple Range Test at 5% probability level. Results showed significant (p<0.05) differences among the D. edulis genotypes for most of the traits evaluated  indicated variation in the performance of the genotypes and  pattern of clustering indicated that there was no association between eco-geographical distribution of genotypes and genetic diversity. PCA revealed that fourteen axes accounted for 100% of the variations observed while the first five axes contributed 73.23% of the total variation observed. The first axis accounted for 25.61% of the total variation while the second and third accounted for 15.43 and 15.01%, respectively. The fourth axis contributed 9.82% of the total variation while the fifth axis contributed 7.36% of the total variation. Significant phenotypic and genotypic correlations were observed between most of the plant characters evaluated and biomass accumulation  which is an indication that the phenotypic association will be a good index for the genotypic association.



Ajibesin, K.K. 2011. Dacryodes edulis (G. Don) H.J. Lam: A review on its medicinal, Phytochemica land economical properties. Research Journal of Medicinal Plant 5(1):32-41.

Anegbeh, P.O., V. Ukafor, C., Usoro, Z., Tchoundjeu, R.R.B., Leakey and Schreckenberg., A. 2005. Domestication of Dac­ryodes edulis: 1. Phenotypic variation of fruit traits from 100 trees in Southeastern Nigeria. New Forests 29:149– 160.
Atangana, A.R., Ukafor, V., Anegbeh, P.O., Asaah, E., Tchoundjeu, Z., Usoro, C., Fondoun, J.M., Ndoumbe, M., Leakey, R.R.B. 2002. Domestication of Irvingia gabonensis: 2. The selection of multiple traits for potential cultivars from Cameroon and Nigeria. Agroforest Syst 55:221-229.

Awono, A., Ndoye, O., Schreckenberg, K., Tabuna, H., Isseri, F., and Temple, L. 2002. Production and marketing of safou (Dacryodes edulis) in Cameroon and internationally: market development issues. Forests, Trees and Livelihoods, 12:125-147

Degrande, A., Tadjio, P., Takoutsing, B., Asaah, E., Tsobeng, Tchoundjeu, Z. 2013. Getting trees into framers’ fields: Success of rural nurseries in distributing high quality planting materials in Cameroon. Small-Scale Forestry 12(3):403-422.

Hair, J.F., Anderson, R.E., Tathan, R.L., and Black, W.C. 1995. Multivariate data analysis. 5th (ed). Prentice. Hall international Inc. London.

Hajjar, R., Jarvis, D.I., Gemmill-Herren, B., 2008: The ultility of crop genetic diversity in maintaining ecosystem services. Agricultural Ecosystem and Environment 123(4), 261-270

Hemeida, A.A., Hassan, M.T, James, A.S. 1998. The identification of some Acacia species by Amplified Fragment Length Polymorphisms (AFLP) molecular markers. In Proceedings of the International Conference of Genetic Engineering and its Applications, Sharm El-Sheikh, South Sinai, Egypt (8–11 April 2004), pp.197-211.
Isseri, F., Temple, L. 2000. Quantification de la production et analyse du marche du safou au Cameroun. In: Actes du 3eme séminaire International sur la valorisation du safoutier et autres oléagineux non- conventionnels, Yaoundé, 3-5 Octobre 2000.

Josephine, T.M, Gordon, O., Zac T., Alice, M., Alain T., Ebenezer, A. and Robert, K. 2015. Genetic diversity of Dacryodes edulis provenances used in controlled breeding trials. Journal of Plant Breeding and Crop Science pp
Kengue, J., 2002. The African bush butter tree: Dacryodes edulis G. Don. International Centre for Underutilised Crops, Southampton, UK.

Kengue, J. Tchuenguem, F.N., Adewusi, H.G. 2002. Towards the improvement of safou (Dacryodes edulis).Population and Reproductive Biology.Forest, Tree and Livelihood. 2002: 73-84.

Leakey, R.R.B. 2010. Agroforestry: a delivery mechanism for Multi-functional Agriculture. In: Handbook on Agroforestry: Management Practices and Environmental Impact, 461-471, Ed. Lawrence R. Kellimore, Nova Science Publishers. Environmental Science, Engineering and Technology Series, USA

Munjuga, M., Ofori, D., Sawe, C., Asaah, E., Anegbeh, P., Peprah, T., Mpanda, M., Mwaura, L., Mtui, E., Sirito, C., Atangana, A., Henneh, S., Tchoundjeu, Z., Jamnadass, R., Simons AJ 2008. Allanblackia propagation protocol. World Agroforestry Centre (ICRAF), Nairobi, Kenya, ISBN 978-92-9059-231-0.

Ndoye, O., Pérez, M.R., Eyebe, A. 1998. The market of non-timber forest products. Commerce transfrontalier et intégration régionale en Afrique centrale: Cas des produits forestiers non ligneux. Orstom, Cahiers des sciences humaines. ODI, Rural development forestry network, winter: 20p.

Omonhinmin, A.C. 2012. Ethnobotany of Dacryodes edu­lis (G.Don) H.J. Lam in Southern Nigeria 1: Practices and applications among the Yoruba speaking people. Ethno­botany Research & Applications 10:175–184.

Onana, J.M. 2008. A synoptic version of Dacryodes edulis (Burseraceae) in Africa, with a new species from central Africa. Kew Bulletin. 63:385-400.

Selvakumar, K.S., Soundrapandian, G., Amirthadevarathinam, A., 1989. Genetic divergence for yield and yield components in cold tolerance rice. Madras Agric. J., 76, 688-694.

Singh, A.K., Singh, S.B., Singh, S.M., 1996. Genetic divergence in scented and fine genotypes of rice (Oryza sativa L.) Ann. Agric. Res., 17, 163-166.

Tabuna, H. 1999 Le marche des produits forestiers non ligneux de l‘Afrique Central en France et en Belgique : produits, acteurs, circuits de distribution, débouches actuels. Occasional paper No 19 CIFOR, 32p.

Takoutsing, B., Tchoundjeu, Z., Degrande, A., Asaah, E., Gyau, A., Nkeumoe, F., Tsobeng, A. 2013. Assessingthe quality of seedlings in small-scale nurseries in the highlands of Cameroon: the use of growth characteristics and quality thresholds as indicators.Small-Scale Forestry 12(1):1-15. 10.1007/s11842-013-9241-7

Trethowan, R.M., Kazi, A.M. 2008. Novel gerplasm resources for improving environment stress tolerance of hexaploid wheat. Crop science 48: 1255-1265.

Vivekananda, P., Subramaninan, S. 1993. Genetic divergence in rainfed rice, Oryza. 39, 60-62.

Waruhiu, A.N., Kengue, J., Atangana, A.R., Tchoundjeu, Z. Leakey, R.R.B. 2004. Domestication of Dacryodes edulis.2. Phenotypic variation of fruits in 200 trees from four populations in the humid lowlands of Cameroon, in Food, Agriculture and Environment, 2:340-346
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