Efficacy of Different Concentrations of NAA on Selected Ornamental Woody Shrubs Cuttings

Abstract

Ornamental woody shrubs are used in landscape design worldwide. Their propagation can be made generatively and vegetatively. Vegetative propagation methods are mostly used by nurseries, as such methods are quick and the newly propagated plants inherit the genetics of the mother plant. However, rooting in some woody plants is slow and, unfortunately, sometimes produces only a small number of rooted cuttings. In this study, shoot cuttings from six selected ornamental woody shrubs were subjected to different concentrations of rooting stimulators (0.5 (NAA5) and 0.8 (NAA8) % concentrations of 1-Naphthylacetic acid; cuttings without treatment were considered as control) and propagated in two different periods (spring and summer). Our results show that significant changes were obtained in the plants under the different treatments. Most of the plants showed a positive response to both treatments, expect for Cotinus coggygria ‘Royal Purple’, which, compared to control, registered decreases in all the tested parameters under NAA5 treatment. Ilex aquifolium was the species that showed increments in all the parameters when NAA treatments were applied. In conclusion, our research suggests that NAA increases rooting in ornamental woody shrubs, although in some cases rooting could be a species-dependent process.

Seaweed Extracts as Substitutes of Synthetic Hormones for Rooting Promotion in Rose Cuttings

“…A key challenge in the production of ornamental plants is the combination of sustainable practices and cultivation and propagation efficiency [1]. Plant propagation in the floricultural sector relies on different techniques, among which the use of stem cuttings is one of the most used for woody plant species, such as roses, also for its timesaving and cost-efficiency [2,3]. This method allows the maintenance of desirable characteristics in superior rose cultivars, particularly considering their high degree of heterozygosity and polyploidy, but can be affected by the deep genotypic differences in rooting ability within this genus [4].…”

Image Analysis of Adventitious Root Quality in Wild Sage and Glossy Abelia Cuttings after Application of Different Indole-3-Butyric Acid Concentrations

“…Cutting success, entailing quality AR formation [ 36 ] with high rooting percentage, depends on numerous factors such as cutting type, environmental conditions, nutritional levels of the stock plant, rooting medium and phytohormone application [ 37 , 38 ]. Several studies have highlighted the importance of auxin use in improving AR formation and maximizing production efficiency in woody species with high market demand [ 5 , 39 , 40 , 41 ]. Ornamental nurseries frequently apply IBA to cuttings, although not in concentrations tailored to the specific shrub species or cultivar; this leads to increased costs and often poor-quality root cuttings.…”

“…Seed germination may be poor or erratic due to dormancy [ 3 ]; moreover, the viability of seeds is very low [ 4 ]. In the horticultural industry, vegetative propagation is the most popular method, as it is cheaper, easier and faster than sexual reproduction [ 5 ]; the plants produced are clones that maintain the morpho-physiological and genetic characteristics of the stock plants, uniformity and earliness of production [ 6 ].…”

Could Affect the Rooting of Two Taxus Baccata Varieties Stem Cutting Length and Propagation Period?

“…Ornamental trees and shrubs interest has been enhancing in the recent years, and are important part of horticulture and landscaping, moreover can be used to amplify the visual effect of a home garden, park, even a walkway, they can be flowering or non-flowering plants (Naik, 2018). With an increasing request of ornamental trees and shrubs the growers are in a need of new propagation methods (Kentelky et al, 2021), also to reduce the propagation material quantity. All ornamental trees and shrubs could produce flowers, moreover seeds, nevertheless they demand favourable climatic conditions, and in some case can take many years to develop mature plants.…”