Variação genética, herdabilidade e ganhos na seleção para caracteres de crescimento e forma em teste de progênies de polinização aberta de Eucalyptus cloeziana

The aim of this study was to estimate genetic parameters for growth and stem form traits in a progenies test of Eucalyptus cloeziana, at 24 years of age, established in Luiz Antônio, SP. The trial was installed with open-pollinated seeds from 35 seed-trees from Helenvale and Cardwell St. Forest provenances, Australia. The trial was installed in a randomized block design, with single tree plots and 100 replications. The trial was measured at 24 years of age for diameter at breast height DBH, total height, volume and stem form. Significant differences among progenies were obtained for all traits. High genetic coefficients of variation and heritabilities were detected for all traits, showing a strong genetic control in the traits and the possibility to obtain genetic gains by massal selection among and within progenies. The expected genetic gains for stands with 24 years of age, growing in sites with the same environmental characteristics of Luiz Antônio and with seeds collected after selection in the progeny test were estimated in 42.91% for DBH, 16.82% for height and 20.35% for stem form.