Abstract
Most old roses are difficult to root when propagated by cuttings. This research focused on the response of stem cuttings of Rosa “Hurdal” to plant origin preparations used as rhizogenesis enhancers through changes to the anatomical structure of the basal part of the stem. Cuttings derived from shoots in four phenological stages were prepared for the experiment: flower buds closed (H1); fully flowering (H2); immediately after petals have fallen (H3); 7–14 days after petals have fallen (H4). The cuttings were treated with 0.4% indole butyric acid (IBA; Ukorzeniacz Aaqua) or 0.2% naphthalene acetic acid (NAA; Ukorzeniacz Baqua), and with plant origin preparations: Algae extract (Bio Rhizotonic), Organic preparation (Root JuiceTM), and Plant extract (Bio Roots). A high rooting percentage in comparison to the control (27.5%) was obtained after treatments of the H1 cuttings with Algae extract (90%), Organic preparation (80%), and Plant extract (75%). The H4 cuttings did not root, probably as a result of an overgrowing callus and limited xylem formation. The anatomical structure of the shoot differed in subsequent phenological stages during the period of rooting in various ways, depending on the rooting enhancer used for treatment. Numerous correlations between rooting percentage and anatomical structure were proved, including the key role of vascular bundles in increasing rooting percentage by widening the vessel diameter.
Highlights
Roses belong to the oldest and most important cultivated ornamental plants (Smulders et al, 2019), and have been significant in many fields of human life for thousands of years (Gustavsson, 1999)
The aims of this research were to recognize the response of cuttings Rosa “Hurdal” in anatomical structure to the plant origin preparations during the process of rhizogenesis
The cortical parenchyma had a similar width to the vascular bundle ring visible on cross sections of all four phenological stages of shoots
Summary
Roses belong to the oldest and most important cultivated ornamental plants (Smulders et al, 2019), and have been significant in many fields of human life for thousands of years (Gustavsson, 1999). The majority of old roses can be successfully cultivated in the temperate zone in a climate with harsher winters on their own roots without budding on the rootstock (Gustavsson, 1999). Their maintenance in cultivation is important for biodiversity conservation and the preservation of the heritage of garden plants, and so for the implementation of the provisions of the Convention on Biological Diversity (CBD) made in Rio de Janeiro on 5 June 1992. The shrubs exhibit great frost hardiness and are appropriate for cultivation in a hard Scandian climate (Gustavsson, 1999)
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