RESUMO: Os objetivos deste trabalho foram avaliar a competência ao enraizamento de miniestacas ao longo das quatro estações do ano e determinar o tempo de enraizamento adventício de clones de canjerana. O minijardim clonal foi estabelecido com 11 clones em um sistema fechado de cultivo. Foram realizadas avaliações do número total de miniestacas produzidas por minicepa, da percentagem de sobrevivência e de enraizamento das miniestacas, do número de raízes, do comprimento médio das raízes e contabilizado o número de miniestacas enraizadas por minicepa, ao longo das quatro estações do ano. Os dados foram submetidos à análise de variância e realizado teste de comparação de médias. Também foi elaborada a curva de enraizamento para os clones 10SM05, 12SMI25 e 12SMI43, com alta competência ao enraizamento adventício. Clones de canjerana podem ser selecionados para a competência ao enraizamento adventício das miniestacas nas diferentes estações do ano. Miniestacas de canjerana devem ser cultivadas em câmara úmida por 63 dias para o enraizamento.

ABSTRACT: The objectives of this research were to evaluate the rooting competence of mini-cuttings throughout the four seasons and to estimate the adventitious rooting time of canjerana clones. A clonal mini-garden was established with 11 clones in a closed hydroponic system. Evaluations were performed throughout the four seasons for the number of mini-cuttings produced per mini-stump, percentage of survival and rooting of mini-cuttings, number of roots, average root length, and number of rooted mini-cuttings per mini-stump. Data were submitted to analysis of variance and means were compared. A rooting curve was estimated for clones 10SM05, 12SMI25, and 12SMI43 that exhibited high competence for adventitious rooting. Our results indicated that canjerana clones can be selected for adventitious rooting competence of mini-cuttings during different seasons, and that canjerana mini-cuttings should be cultivated for 63 days in a rooting chamber.

Abstract: This study aimed to evaluate half-sibling progenies for developing breeding strategies and to select mate clones with adventitious root competence, required for vegetative propagation by mini-cuttings. For rooting, single-bud mini-cuttings of 2 cm length were treated with indolebutyric acid at 2000 mg L-1. At 60 days of cultivation, the mini-cuttings were evaluated for percentages of survival and rooting, number and mean length of the three largest roots, and number of rooted mini-cuttings per mini-stump. These data were analyzed considering the mixed model described for a completely randomized design, an environment, half-sibling progenies, and a single plant per plot, by using the SELEGEN-REML/BLUP software. The 50 genotypes with the highest number of rooted mini-cuttings were selected. The genetic gain was 48.41% for the number of rooted mini-cuttings per mini-stump. Selection for adventitious rooting based on the number of rooted mini-cuttings can be used in mate breeding programs for vegetative propagation by mini-cuttings.