03344nab a2200265 i 4500003000900000005001700009008004100026040001800067072001400085100002400099100003200123100001900155100002800174100003000202245009000232500006500322520111500387520121401502650001502716650002502731650002702756650003002783773018802813856007703001BR-BrBNA20240813155816.0240813b2016    bl.mr|pooa||| 00| 0 eng |  aBR-BrBNAbeng  aF02b3100  aPimentel, Nathalia   aBisognin, Dilson Antônio   aKielse, Paula   aLencina, Kelen Haygert   aMello, Uilian Stefanello   aShoot segment and substrate composition in rooting of juvenile ipe-roxo mini-cuttings  aPublicação on-line; 22 ref.; 3 tables; Sumaries (En, Pt)  a

ABSTRACT - This study aimed to evaluate the rooting capability of apical and nodal mini-cuttings of ipe-roxo (Handroanthus heptaphyllus) in different substrates. Shoots produced from ministumps were fractioned into mini-cuttings 2-cm long apical or nodal mini-cuttings and treated with 1000 mg L-1 of indolebutyric acid (IBA). Four substrate combinations were evaluated: commercial substrate composed of pine bark and vermiculite in proportions of 1:1, 2:1 and 1:2 (v /v) and commercial substrate, vermiculite and sand in the proportion of 1:1:1 (v/v). The factorial experiment utilized a completely random design, with five replicates of four mini-cuttings. Rooting, shooting and survival percentage, number and length of shoots and roots were evaluated at 60 and 90 days of growth. Commercial substrate and vermiculite are a good combination for rooting mini-cuttings of ipe-roxo. Apical and nodal mini-cuttings exhibit similar rooting behavior and both are feasible for production of ipe- roxo plantlets.

Key words: Handroanthus heptaphyllus, tree species, vegetative propagation and mini - clonal hedge.  a

RESUMO - O objetivo deste estudo foi avaliar o enraizamento de miniestacas apicais e nodais de ipê-roxo (Handroanthus heptaphyllus) em diferentes substratos. Brotos coletados de minicepas foram seccionados em miniestacas de 2cm de comprimento, classificadas em apical ou nodal e tratadas com 1000mg L-1 de ácido indolbutírico (AIB). Foram também testadas as composições de substrato comercial à base de casca de pinus e vermiculita nas proporções de 1:1; 2:1 e 1:2 (v/v) e de substrato comercial, vermiculita e areia grossa (1:1:1 v/v). O experimento foi um fatorial no delineamento inteiramente casualizado, com cinco repetições de quatro miniestacas. A porcentagem de enraizamento, de brotação e de sobrevivência, o número e comprimento de brotos e raízes foram avaliados aos 60 e 90 dias. Miniestacas de ipêroxo cultivadas em substrato comercial e vermiculita apresentam maior capacidade de enraizamento. Miniestacas apicais e nodais apresentam similar comportamento de enraizamento, podendo ambas serem utilizadas para a produção de mudas de ipê-roxo.

Palavras-chave: Handroanthus heptaphyllus, espécie arbórea, propagação vegetativa e minijardim clonal.  aIPÊ ROXO  aSUBSTRATO DE CULTURA  aENRAIZAMENTO DE ESTACA  aPROPAGAÇÃO VEGETATIVA0 02408dSanta Maria-RS Universidade Federal de Santa Maria - Centro de Ciências Rurais 1991o2024-1179tCiência Rural (Brazil)x0103-8478gv. 46(6) p. 996-1002; (2016)wBR2024001331  uhttps://www.scielo.br/j/cr/a/QbqCQzXKyNDJsBQs9b4NQ7y/?format=pdf&lang=en