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Numerical taxonomic studies on cacao (Theobroma cacao L.) in Trinidad

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Summary

Morphological and biochemical characterization of cacao germplasm has been undertaken in the International Cocoa Genebank, Trinidad (ICG, T) to provide useful information for breeders and other users of the crop and in order to facilitate assessment of the genetic diversity of the collection. Use of the full list of standardized morphological descriptors recommended by the International Board for Plant Genetic Resources (IBPGR) prolongs the process of data collation. The work reported in this paper describes an attempt to develop a much shorter list, which contains the most discriminative or taxonomically useful descriptors. Twelve taxonomically useful quantitative descriptors have been identified, using numerical taxonomic techniques.

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References

  • Asomaning, A. & D.R.G.Gwyne-Jones, 1974. Cacao in West-Africa. Oxford University Press, Ibadan. 146 pp.

    Google Scholar 

  • Cheesman, E.E., 1944. Notes on the nomenclature, classification and possible relationships of cacao populations. Tropical Agriculture (Trinidad) 21: 144–159.

    Google Scholar 

  • Engels, J.M.M., 1981. Genetic resources of cacao. Catalogue of CATIE collection. Technical Bulletin No. 7. CATIE Plant Genetic Resources Unit, Turrialba. 196 pp.

    Google Scholar 

  • Engels, J.M.M., 1983a. A systemic description of cacao clones. I. The discriminative value of quantitative characteristics. Euphytica 32: 377–385.

    Google Scholar 

  • Engels, J.M.M., 1983b. A systematic description of cacao clones. II. The discriminative value of qualitative descriptors and the practical compatibility of the discriminative values of quantitative and qualitative descriptors Euphytica 32: 387–396.

    Google Scholar 

  • Engels, J.M.M., 1986. The systematic description of cacao clones and its significance for taxonomy and plant breeding. Doctoral thesis Agricultural University, Wageningen. 125 pp.

  • Engels, J.M.M., B.G.D.Bartley & G.A.Enríquez, 1980. Cacao descriptors, their states and modus operandi. Turrialba 30: 209–218.

    Google Scholar 

  • Enríquez, G.A. & V.J.Soria, 1967a. Selección y estudio de los carácteres útiles de la flor para la identificación y descripción de cultivares de cacao. Cacao (Costa Rica) 12: 8–16.

    Google Scholar 

  • Enríquez, G.A. & V.J.Soria, 1967a. A study of certain leaf characteristics of cacao. Tropical Agriculture (Trinidad) 44: 117–123.

    Google Scholar 

  • Fowlkes, E.W. & C.L.Mallows, 1983. A method for comparing two hierarchical clusterings. Journal of the American Statistical Association 78: 553–584.

    Google Scholar 

  • IBPGR Secretariat, 1981. Report: IBPGR Working Group on genetic resources of cacao. ACP: IBPGR/80/56 March 1981, Rome. 28 pp.

  • Krzanowski, W.J., 1987. Selection of variables to preserve multivariate data structure using Principal Components. Applied Statistics 36: 22–33.

    Google Scholar 

  • Lockwood, G. & M.M. Gyamfi, 1979. The CRIG Cacao Germplasm collection with notes on codes used in the Breeding Programme at Tafo and elsewhere. The Cocoa Research Institute, Ghana Technical Bulletin No. 10: 1–62.

  • Lopez, O.B. & G.A. Enríquez, 1988. Inheritance of dry weight and bean shape in cacao. Proceedings of the 10th International Cocoa Research Conference, Santo Domingo, Dominican Republic, 1987. pp. 691–694.

  • Lucas, P. & P.H. de Reffye, 1981. Assessments of genetic parameters for some cacao tree clones. Proceedings of the 7th International Cacao Conference, Douala, Cameroon, 1979. pp. 541–543.

  • Mardia, K.V., J.T.Kent & J.M.Bibby, 1979. Multivariate Analysis. Academic Press, London. pp. 213–243.

    Google Scholar 

  • Ostendorf, F.W., 1956. Identifying characters for cacao clones.

    Google Scholar 

  • Pound, F.J., undated. Varieties of cacao used for commercial purposes. In: H. Toxopeus (Ed). Archives of Cocoa Research. 1. Cocoa populations and Witches' Broom disease in South America. International Office of Cocoa and Chocolate and The American Cocoa Research Institute, Washington. pp. 26–71.

  • Pound, F.J., 1932. The genetic constitution of cacao crops. 1. Annual Report of Cacao Research 1931–1945. Imperial College of Tropical Agriculture, Trinidad. pp. 9–26.

    Google Scholar 

  • Sirju-Charran, G., F. Hosein & E. Johnson, 1989. Classification of cacao germplasm using isoenzyme analysis. Quarterly Report of the Cocoa Research Unit, Trinidad, 1989. (unpublished).

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Bekele, F.L., Kennedy, A.J., David, C.M. et al. Numerical taxonomic studies on cacao (Theobroma cacao L.) in Trinidad. Euphytica 75, 231–240 (1994). https://doi.org/10.1007/BF00025608

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