Resumo

CUEVAS-CRUZ, Juan Carlos et al. Asexual propagation of Pinus leiophylla Schiede ex Schltdl. et Cham.. Rev. Chapingo ser. cienc. for. ambient [online]. 2015, vol.21, n.1, pp.81-95. ISSN 2007-4018.  https://doi.org/10.5154/r.rchscfa.2014.08.033.

The effect of substrate, type of cutting and indole 3-butyric acid (IBA) concentration on the rooting of Pinus leiophylla cuttings was evaluated with the goal of multiplying progenies of half-sib families of this species, which have showed superior growth and positive response against Toumeyella pinícola attack. Two types of substrates (100 % perlite vs. a mix of peat, perlite, vermiculite at a ratio of 1:1:1), two types of cuttings (apical vs. basal) and two concentrations of IBA (0 vs. 10,000 ppm) were used. Probability and percentage of rooting, growth of cuttings and characteristics of the roots were evaluated. Results indicate that using basal cuttings is 3.5 times more likely to induce rooting of P. leiophylla than using apical cuttings. The treatment consisting of the mixture of peat-perlite-vermiculite, a basal cutting and 10,000 ppm of IBA produced 45.3 % rooting (highest percentage), while the control only yielded 8.6 % rooting (perlite, basal cutting and without IBA). Interactions with the type of substrate showed significant differences (P ≤ 0.05) in the growth of the cuttings. The use of perlite and application of IBA promoted a greater number of roots, particularly in the basal cuttings of P. leiophylla.

Palavras-chave : Indole 3-butyric acid; clone; root morphology; rooting of cuttings.