Resumo

PRIETO-RUIZ, José Ángel et al. Survival and root growth of tender and lignified lemon cypress cuttings with different substrates and rooting agents. Rev. mex. de cienc. forestales [online]. 2022, vol.13, n.73, pp.155-174.  Epub 10-Out-2022. ISSN 2007-1132.  https://doi.org/10.29298/rmcf.v13i73.1220.

The rooting of cuttings allows propagation of ornamental plants that are difficult to reproduce from seeds. Lemon cypress (Cupressus macrocarpa var. lutea) is widely used for ornamental purposes. In this work, the effect of three factors on the survival and primary root growth of lemon cypress: two substrates (base mix and perlite), four rooting agents (Radix® 1 500, Radix® 10 000, Raizone® Plus and Raizplant® 500), and control (no rooting agent), plus two maturity conditions of the cuttings (tender and lignified) were assessed. The treatments were distributed in a randomized block design, with a 2×5×2 factorial arrangement. The evaluation was carried out four months after the rooting started. The response variables were statistically analyzed with the Kruskal Wallis test and Dunn's test to compare paired medians; in addition, the Dunnett's test of multiple comparisons of medians was applied. Significant differences were obtained for survival from the rooting effect and maturity of cuttings, in addition to the triple interaction of the assessed factors. The highest survival (45 %) was achieved by using perlite plus Radix® 1 500 on lignified cuttings. The largest primary root growth was recorded without rooting and with tender (11.75 cm) and lignified (10.87 cm) cuttings, regardless of the substrate. Although root growth was superior without rooting, it is recommended to use Radix® 1 500 to promote callus formation and ensure better survival. The substrate, rooting media, and the maturity of cuttings influence the survival and primary root growth of lemon cypress cuttings.

Palavras-chave : Indole-3-butyric acid; Cupressus macrocarpa Hartw. ex Gord. var. lutea Topacio; maturity of the cuttings; ornamental plants; vegetative propagation; asexual reproduction.