Work

Mini-cutting size, mini-tunnel management and phytohormones in the clonal propagation of Eucalyptus urophylla and hybrids of Corymbia spp.

Year: 2025

Type: article

Abstract: The area planted with Corymbia spp. clones is expected to increase in the coming years, despite their propagation challenges. This study aimed to evaluate mini-cutting size, mini-tunnel opening time, and the use of growth regulators in the clonal propagation of Corymbia spp. Four experiments were conducted using three clones: C. citriodora × C. torelliana, C. torelliana × C. citriodora, and E. urophylla, where E. urophylla was used as a control due to its ease of propagation. The results from each experiment were used to optimize the methodology for the subsequent one. Initially, three mini-cutting sizes were tested: 5, 10, and 15 cm in length. The second experiment evaluated three collection times of mini-cuttings after mini-tunnel opening: 0, 24, and 48 hours. The third experiment tested five concentrations of indole-3-butyric acid (IBA): 0, 500, 1000, 1500, and 2000 mg kg⁻¹. Finally, five concentrations of a formulated product containing different plant growth regulators (0, 1, 2, 3, and 4 mL L⁻¹) were assessed. All experiments were arranged in a randomized block design in a factorial scheme according to genotype. The following variables were evaluated: final rooted mini-cutting yield, survival, plant height, root length, and root, shoot, and total dry mass. Mini-cuttings of 15 cm performed best in promoting the growth of both hybrids. Regarding mini-tunnel opening time, the 24-hour interval after opening was optimal for C. citriodora × C. torelliana. Applications of 2000 and 1000 mg kg⁻¹ IBA promoted rooting in Corymbia spp., and rooted mini-cutting quality was improved with the application of 4 mL L⁻¹ of the growth regulator formulation.

Source: Revista Árvore

DOI: 10.53661/1806-9088202650263952

Authors: Rosália Nazareth Rosa Trindade, Gabriel Faria Parreiras de Andrade, Augusto Matias de Oliveira, Miranda Titon, Márcia Regina da Costa

Institutions: Universidade Federal de Viçosa, Universidade de Rio Verde, Universidade Federal dos Vales do Jequitinhonha e Mucuri

Language: English

Topic: Seedling growth and survival studies

Subfield: Nature and Landscape Conservation

Field: Environmental Science

Domain: Physical Sciences

SDG: Zero hunger

Open Access status: gold

Estimated APC paid: $95