Abstract
Stability of the genetic divergence among five non-commercial cacao cultivars at advanced ages was investigated over a five-year period (1986–1990). Cluster analysis was performed on five yield components measured on harvests from each crop year and on the data pooled over five years. The temporal stability was assessed by using clustering procedure, which involved the calculation Mahalanobis distance (D2) and of Tocher's algorithm applied to the distance matrix. The comparison of D2 and of clusters based upon pooled analysis, and taken as the standard, with D2 values and clusters obtained from each year showed a stable clustering pattern in the most favourable year. For the rest of the years, inconsistency in number and composition of clusters formed was observed. An optimum environment was shown to be important for better expressing divergence by D2. Consequently, the evaluation of the genetic divergence among the studied cultivars may be conducted based on a single favourable year. This will result in considerable savings in man power, financial resources, and time which would be wasted should the evaluation be extended for several years.
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References
Alvim, P.T., 1957. Correlação entre chuva, temperature e produção do cacaueiro. Proc 6th Interamer Cocoa Conf 1956: 133–136.
Alvim, P.T., 1973. Pesquisas com o cacaueiro no Brasil. Ciência e Cultura 25: 409–424.
Atanda, O.A., 1972. Correlation studies in Theobroma cacao L. Turrialba 22: 81–89.
Bartley, B.G.D., 1970. Yield variation in the early productive years in trials with cacao (Theobroma cacao L.). Euphytica 19: 199–206.
Bhatt, G.M., 1976. An application of multivariate analysis to selection for quality characters in wheat. Aust J Agric Res 27: 11–18.
Dias, L.A.S. & P.Y. Kageyama, 1995. Combining-ability for cacao (Theobroma cacao L.) yield components under southern Bahia conditions. Theor Appl Genet 90: 534–541.
Dias, L.A.S. & P.Y. Kageyama, 1996a. Comparisons between multivariate methods applied to the evaluation of genetic divergence in cacao (Theobroma cacao L.). Agronomie submitted.
Dias, L.A.S. & P.Y. Kageyama, 1996b. Multivariate genetic divergence and hybrid performance of cacao (Theobroma cacao L.). Brazil J Genetics: in press.
Dijksterhuis, G.B. & J.C. Gower, 1991. The interpretation of generalized procrustes analysis and allied methods. Food Qual Prefer 3: 67–87.
Ghaderi, A., M. Shishegar, A. Rezai & B. Ehdaie, 1979. Multivariate analysis of genetic diversity for yield and its components in mung bean. J Amer Soc Hort Sci 104: 728–731.
Gower, J.C., 1975. Generalized procrustes analysis. Phychometrika 40: 33–51.
Janoria, M.P., A.M. Rhodes & M.N. Shrivastava, 1976. Phenetic similarity among dwarf rice cultivars, grown in two environments, as estimated by numerical taxonomic methods. Ann Bot 40: 845–849.
Mahalanobis, P.C., 1936. On the generalized distance in statistics. Proc Nat Inst Sci, India 2: 49–55.
Mariano, A.H., M.M. Yamada & M.G. Pereira, 1988. Comportamento de híbridos de cacau sob distintas condições de clima e solo. Proc 10th Int Cocoa Res Conf 1987: 627–632.
Rao, C.R., 1952. Advanced statistical methods in biometric research. John Wiley, New York, pp. 390.
Sheriff, R.A., 1992. Divergence analysis in finger millet (Eleusine coracana Gaertin). The Indian J Genet Plant Breed 52: 72–74.
Singh, T.H. & S.S. Gill, 1984. Genetic diversity in upland cotton under different environments. The Indian J Genet Plant Breed 44: 506–513.
Singh, S. & P.K. Gupta, 1979. Genetic divergence in pearl millet. The Indian J Genet Plant Breed 39: 210–215.
Somayajulu, P.L.N., A.B. Joshi & B.R. Murty, 1970. Genetic divergence in wheat. The Indian J Genet Plant Breed 30: 47–58.
Upadhyay, M.K. & B.R. Murty, 1970. Genetic divergence in relation to geographical distribution in pearl millet. The Indian J Genet Plant Breed 30: 704–715.
Varma, N.S. & S.C. Gulati, 1982. Genetic divergence in 2-rowed and 6-rowed barley. The Indian J Genet Plant Breed 42: 314–318.
Van Laar, A., 1991. Forest Biometry. Sappi Forests, Stellenbosch, pp. 590.
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Antônio dos Santos Dias, L., Kageyama, P.Y. Temporal stability of multivariate genetic divergence in cacao ( Theobroma cacao L.) in Southern Bahia conditions. Euphytica 93, 181–187 (1997). https://doi.org/10.1023/A:1002991915978
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DOI: https://doi.org/10.1023/A:1002991915978