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Objetivou-se com este trabalho, avaliar a eficiencia da utilizacao de diferentes coeficientes de similaridade na estimacao da diversidade genetica de Jatropha curcas L. utilizando marcadores moleculares ISSR. O DNA genomico foi extraido a partir de folhas jovens de 43 acessos de pinhao-manso. Matrizes de dissimilaridade genetica foram obtidas a partir dos coeficientes Baroni, Coincidencia Simples, Hamann, Indice II, Indice III, Jaccard, Nei e Li, Ochiai I, Ochiai II, Rogers e Tanimoto e Sokal e Sneath. Os dendrogramas foram construidos utilizando o metodo UPGMA e comparados mediante os parâmetros de coeficiente de correlacao cofenetico, estresse e distorcao. Foram estimadas as correlacoes entre os pares de matrizes pelo teste de Mantel. Houve concordância entre as matrizes originais e as matrizes resultantes do processo de agrupamento para todos os coeficientes estudados. Os indices de Jaccard e Nei e Li nao diferiram quanto ao ordenamento dos acessos avaliados e permitiram maior discriminacao destes, sendo os mais adequados para avaliar a diversidade genetica em pinhao-manso baseada em marcadores moleculares ISSR.Palavras-chave: dissimilaridade genetica; analise de agrupamento; Jatropha curcas L. SIMILARITY COEFFICIENTS FOR EVALUATION OF GENETIC DIVERSITY IN JATROPHA BY ISSR MARKERS ABSTRACT:The aim of this work was to evaluate the efficiency of using different similarity coefficients in the estimation of Jatropha curcas L. genetic diversity using ISSR molecular markers. Genomic DNA was extracted from young leaves of the 43 jatropha accessions. Genetic dissimilarity matrices were obtained from the Baroni, Simple Matching, Hamann, Index II, Index III, Jaccard, Nei and Li, Ochiai I, Ochiai II, Rogers and Tanimoto and Sokal and Sneath coefficients. The dendrograms were constructed using the UPGMA method and compared using the co-phenetic correlation coefficient, stress and distortion parameters. Correlations between pairs of matrices were estimated by the Mantel test. There was agreement between the original matrices and the matrices resulting from the grouping process for all the studied coefficients. The Jaccard and Nei and Li indices did not differ in terms of the order of the evaluated accessions and allowed for greater discrimination of these, being the most suitable for assessing genetic diversity in physic nut based on ISSR molecular markers.Keywords: genetic dissimilarity; cluster analysis; Jatropha curcas L.

COEFICIENTES DE SIMILARIDADE PARA AVALIAÇÃO DA DIVERSIDADE GENÉTICA EM PINHÃO-MANSO POR MARCADORES ISSR