Effect of indol-3-butiric acid

• Published in: Ciência florestal 2015-10, p.1043
• Main Authors: de Freitas de Oliveira, Taiane Pires, Barroso, Deborah Guerra, Lamonica, Kelly Ribeiro, Carvalho, Virginia Silva, de Oliveira, Marcos Andre
• Format: Article
• Language: Spanish
• ISSN: 1980-5098; 1980-5098

The Handroanthus heptaphyllus Mattos know as "ipe-roxo" is usually propagated by seeds. An propagation alternative for species. Is the vegetative propagation, technique that stimulates seedling production on a commercial scale besides the expected gain in characteristic as the uniformity of seedlings in the nursery. The objective of this work was the evaluation the effect of different concentrations of indol-3-butiric acid (AIB) on the apical minicutting rooting of this species. The cuttings were collected from the first ministumps shoots of the minigarden conducted in tubes, 231 days after germination. After the collect the minicuttings were submitted to five AIB concentrations (0; 2,000; 4,000; 6,000 and 8,000 mg [L.sup.-1]). Then were planted in tubes with Basaplant Forest® substrate and slow release fertilizer (Osmocote® 14-14-14). The experiment was carried out in a completely randonmized design with four replicates constituted by ten minicuttings. At 30 days the minicuttings were evaluated about survival, number of roots of the first and second orders, length of first order root and dry mass of the root system. At four months the cuttings were evaluated in height, root-collar diameter, number of leaves, leaf area, stem dry weight, number and length of first order roots and root dry weight. More than 95% survival the minicuttings was observed at 30 days in all treatments, and 80% of them rooted without IBA. However, the number of the second order roots was higher in cuttings submitted to 8,000 mg [L.sup.-1]. The use of IBA is not a condition for rooting of H. heptaphyllus cuttings, although it results in seedlings with longer roots of the first order and number of roots of the second order in the concentration of 8000 mg [L.sup.-1]. Keywords: vegetative propagation; minicutting; rooting. A Handroanthus heptaphyllus Mattos, conhecida popularmente como ipe-roxo, e propagada comumente por via seminal, no entanto, suas sementes quando armazenadas, perdem rapidamente o poder germinativo, sendo assim, uma alternativa de propagacao para esta especie e a propagacao vegetativa, tecnica que favorece a producao de mudas em escala comercial, alem de possibilitar ganho de caracteristicas esperadas como uniformidade da muda no viveiro. O objetivo deste trabalho foi avaliar o efeito de diferentes concentracoes de acido indol-3-butirico (AIB) no enraizamento de miniestacas apicais de ipe-roxo. As miniestacas foram provenientes da primeira coleta de brotacoes das mini