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Stimulation of adventitious root formation by laser wounding in rose cuttings: a matter of energy and pattern

  • Adventitious root (AR) formation is the basis of vegetative propagation in rose, be it via stem cuttings or via stenting. During this process, wounding plays a pivotal role since cell reprogramming takes place at the tissue adjacent to the wound. We investigated the effects of wounding on AR formation on leafy single-node stem cuttings of the rose rootstock R. canina ‘Pfänder’ (codes R02-3 and R02-6) and the cut rose cultivar Rosa ‘Tan09283’ (Registration name ‘Beluga’). Laser wounding treatments were based on the assisted removal of tissue layers located in the bark. The positioning of wounding was studied based on two marking directions: along the cutting base (strip pattern) and around the cutting base (ring pattern). Additionally, the effects of external supply of indole-butyric acid (IBA 1 mg L-1) on rootingwere analyzed. Results showedthat inorder toremovespecific tissue layers, the calculation of the laser energy density (J cm-2) in terms of cutting diameter was necessary. Interestingly, the application of energy densities from 2.5 J cm-2 up to approximately 8.5 J cm-2 were sufficient to expose the tissue layers of epidermis up to regions of phloem. Regarding AR formation for R. canina ‘Pfänder’, characterized by a low rooting response, an increase in the rooting percentage was registered when the laser treatment eliminated the tissue up to phloem proximities. Analysis of the nodal position showed that bud location was a preferential place for AR formation independently of wounding treatment. In case of Rosa ‘Tan09283’, laser treatments did not reduce its high rooting capacity, but an apparent reduction in rooting quality due to an investment in tissue healing was observed when wounding reached deeper layers such as parenchyma and sclerenchyma. Results also showeda strongARformation directly fromwounded regions in case of Rosa ‘Tan09283’ specifically when the woundwas located below the axillary bud. In conclusion, wounding by assisted-elimination of layers by laser can induce positive effects on AR formation of single-node stemcuttings of the rose if energy applied is able to expose phloemproximities,a longitudinalorientation, and relative position to the axillary bud are considered.

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Metadaten
Author:Raul Javier Morales OrellanaORCiD, Thomas RathORCiD, Traud Winkelmann, Andreas Bettin
Title (English):Stimulation of adventitious root formation by laser wounding in rose cuttings: a matter of energy and pattern
URN:urn:nbn:de:bsz:959-opus-37640
DOI:https://doi.org/10.3389/fpls.2022.1009085
ISSN:1664-462X
Parent Title (English):Frontiers in Plant Science
Document Type:Article
Language:English
Year of Completion:2022
Release Date:2022/12/09
Tag:wounding
Rosa canina; adventitious root formation; histology; laser ablation; stem cutting
Volume:13
Page Number:20
Faculties:Fakultät AuL
DDC classes:500 Naturwissenschaften und Mathematik / 580 Pflanzen (Botanik)
Review Status:Veröffentlichte Fassung/Verlagsversion
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International