ABSTRACT:The aims of this research was to estimate genetic parameters of Eucalyptus macarthurii progenies and to predict genetic gain for different selection methods. In order to evaluate the gains, eleven progenies tests were studied. These tests were installed in 1997, in randomized blocks design, in two sites, with 5 replicates of five plants per plot. The progenies were evaluated, from the first to the eighth year, regarding the variable diameter at breast height (DBH). The genetic parameters were estimated using the mixed model procedure (REML/BLUP). The selection of the progenies for establishing a Clonal Seed Orchard was based on the analysis by location, joint analysis and on the harmonic mean of the relative performance of genotypic values (HMRPGV) with different selection intensities among and within families: three, four, five and six individuals per progeny with the selection of the top 30 individuals, taking into consideration the effective population size ( e N ). The best age to carry out the selection was seven years old, however, early selection can be made from age two onwards. Each environment characteristics influenced progenies phenotypic expression, so the higher gains in balance with e N , were estimated with the selection of individuals for each site, and the selection of five or six individuals per progeny. GANHOS GENÉTICOS POR DIFERENTES MÉTODOS DE SELEÇÃO EM PROGÊNIES DE Eucalyptus macarthurii EM DIFERENTES AMBIENTES RESUMO: O objetivo desta pesquisa foi estimar parâmetros genéticos de progênies deEucalyptus macarthurii e estimar ganhos genéticos por diferentes métodos de seleção. Foram utilizados testes de onze progênies, instalados em 1997 em blocos ao acaso, em dois ambientes, com 5 repetições de 5 plantas por parcela. Os indivíduos foram avaliados desde o primeiro ao oitavo ano, quanto à variável diâmetro à altura do peito. Os parâmetros genéticos foram estimados pela metodologia de modelos mistos (REML/ BLUP). A seleção de progênies para formação de Pomar Clonal de Sementes baseou-se na análise por local, análise conjunta e no método da média harmônica do desempenho relativo dos valores genéticos (MHPRVG) com diferentes intensidades de seleção entre e dentro de famílias: três, quatro, cinco e seis indivíduos por família, com seleção dos 30 melhores indivíduos, considerando-se o tamanho efetivo populacional ( e N ). A idade mais indicada para se realizar a seleção foi aos sete anos de idade, porém uma seleção precoce pode ser realizada a partir dos dois anos. As particularidades de cada ambiente influenciaram na expressão fenotípica das progênies, de modo que os maiores ganhos, em equilíbrio com o e

The aim of this study was to verify the influence of mini polytunnels on the quality of shoots produced in a black wattle clone garden. The treatments used were: T1 – clone garden with mini polytunnels inside the greenhouse; T2 – clone garden with no mini polytunnels inside the greenhouse; T3 – clone garden with mini polytunnels outside the greenhouse; and T4 – clone garden with no mini polytunnels outside thegreenhouse. These four treatments formed a 4 x 3 factorial along with three seasons of the year: winter/2015, summer/2015-2016, and autumn/2016. A randomized block design was used with six blocks and ten cuttings per plot. Survival rate, number of shoots per cutting, and mean shoot length were evaluated. Shoots were collected from the cuttings and a rooting experiment with the same design was installed. Rooting rate, rate of shoots with calluses, number of roots per shoot, and mean shoot length per cutting were evaluated. There was interaction between the environment in the clone garden and the season of the year. In the winter, the treatment with mini polytunnels outside the greenhouse (T3) showed the best results, mainly in what concerns to the rooting of shoots. Shoots survived in the four clone garden environments, and the lowest survival rates were observed in the autumn/2016 season. The best responses were observed in the summer season.

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Because of the commercial interest in forest resources provided by black wattle (Acacia mearnsii De Wildman), mainly for tannin extraction, the researches about clonal propagation techniques have been developed for this species. The objective of our study is to determine the type and size of minicuttings for the best adventitious rooting in three commercial clones of black wattle. The minicuttings were collected from a mini-clonal hedge located in the nursery at TANAGRO S.A. Company, located in Montenegro, Brazil. There were tested four sizes of minicuttings (5, 8, 11, 14 and 17 cm); two types depending on the stem cutting position where they were collected (apical or basal) and presence or absence of leaves with entire or half reduced area. The experiments were installed in randomized blocks with four blocks and six minicuttings per parcel. The evaluation of minicuttings rooting was done after 45 days. We conclude that also basal and apical minicuttings with entire or half reduced leaves exhibit higher percentage of rooting, as well as 14 cm minicuttings. Besides that, rooting response also varies according to the clone genotype.