RESUMOO objetivo deste trabalho foi avaliar o comportamento da canafístula (Peltophorum dubium Spreg. Taub.) cultivada em sistema de minijardim clonal e estudar a viabilidade da aplicação da técnica de miniestaquia para a propagação vegetativa desta espécie. Na formação das minicepas, de origem seminal, mantiveram-se diferentes números de folhas (três ou mais, uma folha ou um par de folhas). Avaliou-se a sobrevivência das minicepas, número, comprimento e diâmetro dos brotos e a produtividade média de miniestacas por minicepa durante sucessivas rebrotas. Avaliou-se ainda o efeito da aplicação do AIB (0; 1500; 3000; 4500 e 6000 mg L -1 ) sobre a sobrevivência e o enraizamento de miniestacas basais e apicais. A sobrevivência das minicepas foi de 100% independentemente do número remanescente de folhas na sua formação. A manutenção de 1 folha possibilitou a formação de maior número de brotos (3,39) por minicepa; 1 par de folhas promoveu maior comprimento dos brotos (12,41 cm) e; 3 folhas ou mais originaram brotos de maior diâmetro. A produção média de miniestacas/ minicepa/coleta foi crescente ao longo das sucessivas rebrotas, com máxima produtividade (159 miniestacas m-2 ) na 4ª rebrota. Miniestacas apicais apresentam maior potencial de enraizamento do que as basais. O AIB é dispensável na indução radicial, mas estimula a produção de massa seca das raízes. O manejo da canafístula em sistema de minijardim clonal possibilita a produção de brotos para processos de propagação clonal através da miniestaquia. Palavras-chave: miniestaquia; propagação vegetativa; AIB. ABSTRACTThe present work aimed to evaluate the behavior of canafistula, established in mini-clonal hedge system and the viability of applying the mini-cutting technique for vegetative propagation of this species. In the formation of mini-stumps, of seminal origin, different numbers of leaves were maintained (three or more leaves, one, or a pair of leaves). It was evaluated the survival of mini-stumps, number, length and diameter of shoots and average productivity of mini-cuttings by mini-stumps during the successive regrowth. The
The ‘Cambona 4’ yerba mate (Ilex paraguariensis A. St. Hil. - Aquifoliaceae) stands out for the high productivity and soft taste of the raw material obtained. The seedlings come from the controlled crosses of a female and a male plant. In order to guarantee the planting of even more uniform and productive herbs, the cutting is an alternative of propagation. The objective of this research was to evaluate the rooting capacity of apical and subapical cuttings of six ‘Cambona 4’ clones (C7, C8, C9, C10, C11 and C13) in two seasons, in january (summer/autumn) and april (autumn/winter) treated with 2.000 mg/kg of IBA in the form of talc. The cuttings were standardized with 10 cm, keeping a pair of leaves cut in half. The cutting was done in an agricultural greenhouse, with irrigation by intermittent nebulization, the cuttings were placed to rooting in plastic tubes containing carbonized rice husk. After 120 days, it was verified that the cutting season influenced the response of each clone, but for most clones rooting was higher when performed in summer/autumn, with better rates varying between 78.2% to 90.6% (C8, C9, C11 and C13), while in autumn/winter it was from 59.4% to 75.0% (C7, C10, C11 and C13). In the summer/autumn cutting period, subapical cuttings showed greater survival and rooting than the apical ones, but they didn’t differ when performed in autumn/winter. Leaf retention positively influenced the survival.
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