Stability of Genetic Divergence among Eggplant Accesses in Three Stages of Development
Derly J. H. Silva1, Cyro P. Costa2, Cosme D. Cruz3, Vicente W. D. Casali1 & Luíz A. S. Dias3
Abstract: Genetic divergence stability among 19 eggplant accesses was estimated in three stages of development: vegetative, reproductive and productive. The experiment was carried out in a randomized block design, with three replications and four plants per plot. For each developmental stage, the divergence was calculated from 12, 12 and 5 characteristics, respectively. The cluster analysis, applied to the genetic distance matrix (D2), showed the formation of two clusters in the vegetative stage, four in the reproductive stage and six in the productive stage. Therefore, it was obseved that productive stage characteristics have greater discriminatory capacity. However, inconsistency in respect to the number and composition of clusters formed in different stages was observed. It can be concluded that the genetic divergence estimated among accesses is related only to the variability of the characteristics used in its estimation, and that extrapolation of this variability to other characters may lead to wrong interpretations.
Key words: Solanum melongena, genetic resources, breeding, multivariate analysis
1 Departamento de Fitotecnia/UFV, 36571-000, VIÇOSA - MG. E-mail: firstname.lastname@example.org
2 Departamento de Horticultura ESALQ/USP, C. Postal 9, 13418-900, Piracicaba, SP
3 Departamento de Biologia Geral/UFV, 36571-000 Viçosa, MG
Arunachalam, V. 1981. Genetic distance in plant breeding. Indian Journal Genetic and Plant Breeding. 41(2): 226-236.
Camussi, A. E.; Ottaviano, E; Calinsk, T. E. and Kaczmarek, Z. 1985.Genetic distance based on quantitative traits. Genetics.111:945 – 965.
Cress, C.E. 1966. Heterosis of the hybrid related to gene frequency differences between two populations. Genetics. 53: 269 – 274.
Cruz, C.D. 1997. Programa Genes: aplicativo computacional em genética e estatística. 442p. UFV, Viçosa.
Cruz, C.D.; Carvalho, S.P. and Vencovsky, R. 1994. Estudos sobre divergência genética. I Fatores que afetam a predição do comportamento de híbridos. Revista Ceres. 41(234):178-82.
Falconer, D.S. and Mackay, T.F.C. 1996. Introduction to quantitative genetics. 464p. 4th ed. Longman Group, Essex.
Filgueira, F.A.R. 1982. Manual de olericultura: cultura e comercialização de hortaliças. v.2. Agronômica Ceres, São Paulo.
Harris, R.J. 1975. A primer of Multivariate Statistics. p.332. Academic Press, New York.
IBPGR. 1990. Descriptors for Eggplant/ Descripteurs pour l’Aubergine. 60p. International Board for Plant Resources actually International Plant Genetic Resources Institute, Rome.
Johnson, R.A. and Wichern, D.W. 1982. Applied Multivariate Statistics Analysis. 320p. Prentice-Hall, New Jersey.
Naidu, N.V. and Satyanarayana, A. 1991. Studies on genetic divergence over environments in mungbean (Vigna radiate L. Wilczek). Indian Journal Genetic and Plant Breeding. 51(4): 454-460.
Rao, R.C. 1952. Advanced statistical methods in biometrical research. 390p. John Wiley and Son, New York.
Singh, D. 1981. The relative importance of characters affecting genetic divergence. Indian Journal Genetic and Plant Breeding. 41(2): 237–245.
Singh, R.K. and Chaudary, B.D. 1979. Biometrical methods in quantitative genetic analysis. 304p. Kalyani Publishers, New Delhi.
Singh, T.H. and Gill, S.S. 1984. Genetic diversity in upland cotton under different environments. Indian Journal Genetic and Plant Breeding. 44(3):506–513.
Steel, R.G.; Torrie, J.H. and Dickey, D.A.1997. Principles and procedures of statistics: a biometrical approach. 666p. 3.ed. McGraw-Hill, New York.
Viana, J.M..S.; Cardoso, A.A.; Cruz, C.D.; Regazzi, A.J. and Del Giudice, R.M. 1991 Genetic divergence in sugar cane (Saccharum spp.) clones. Revista Brasileira de Genética. 14(3):753-763.