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

Abstract

Adventitious root (AR) formation is a key step in stem cutting propagation of economically important woody ornamentals. Inadequate environmental and hormonal conditions can lead to the production of an insufficient or modest number of ARs in stem cutting, with a consequent decrease in quality. The aim of this research was to optimize wild sage and glossy abelia autumn stem cutting propagation protocols, using image analysis to assess the effects of different IBA concentrations and cultivars on AR quality. For both taxa, the treatments were: four IBA concentrations: 0, 1250, 2500 and 5000 mg L−1 and two cultivars: ‘Little Lucky’ (cv1) and ‘Yellow’ (cv2) from Lantana, and ‘Canyon Creek’ (cv1) and ‘Eduard Goucher’ (cv2) from Abelia. Results show that IBA application is not needed to enhance rooting ability; however, IBA concentration is an important factor determining the best overall AR quality in both taxa. In wild sage applying 5000 mg L−1 IBA improved AR quality in ‘Little Lucky’, increasing the root number, total length, surface area and number of forks and crossings, but decreased quality in ‘Yellow’. In glossy abelia ‘Edouard Goucher’, 5000 mg L−1 IBA increased the root number, but 1250 mg L−1 IBA improved AR quality; ‘Canyon Creek’ did not perform as well as cv2 at these concentrations. This study confirms that sensitivity to IBA dosage varies among species and their cultivars. Findings may help the commercial nursery industry produce higher quality cuttings.

Different Responses to Adventitious Rhizogenesis under Indole-3-Butyric Acid and Seaweed Extracts in Ornamental’s Cuttings: First Results in Photinia x fraseri ‘Red Robin’

“…Sanitary quality is characterized by the absence of parasites and pathogens [7]; the agronomic quality of a rooted cutting is based on the morphological features of the aerial parts and adventitious roots, which influence health, vigor and uniformity [8,9]. A high number of very fine roots, which are essential for continuous access to water and nutrients, can help the plant withstand transplant shock, increasing survival and plant growth [10]. A multitude of internal and environmental factors affect the production of adventitious roots.…”

“…Among the internal components, phytohormones, particularly auxins, have the most significant impact. Natural (indole-3-butyric acid, IBA) and synthetic auxins (naphthalene acetic acid, NAA), applied exogenously to cuttings [11], play a key role in generating adventitious roots [12,13] and balanced shoots in ornamental species that are recalcitrant to clonal propagation, due to a low concentration of endogenous auxins [10,[14][15][16][17][18][19][20][21][22]. Commercial products based on indole-3-butyric acid (IBA), such as Rhizopon, are one of the most widely used exogenous sources of auxin and they can be delivered to cuttings in talc or dissolved in alcohol to be used as a quick dip [23].…”

The genetic structure and demographic history ofZabelia tyaihyonii, endemic to Korean limestone karst forests, based on genome‐wide SNP markers

“…Indeed, several closely related species, including this species, can be readily cultivated by vegetative cuttings for horticultural (e.g., Abelia × grandiflora: Loconsole et al, 2022) and conservation purposes (e.g., Z. tyaihyonii: Yoon et al, 2022). Availability of asexual reproduction can mitigate the negative genetic impact of population bottlenecks (Roman & Darling, 2007).…”

Propagation of Cunila galioides Benth.: a Medicinal and Aromatic Species Native to South Brazil

“…Vol.66: e23220357, 2023 www.scielo.br/babt Pauletti and coauthors [4], in a previous work, treated C. galioides cuttings with IBA 250 mg•L -1 , aiming to propagate plants from different populations to determine essential oil composition and yield. Loconsole and coauthors [45], tested the effect of increasing IBA concentrations (0 -5,000 mg•L -1 ) on the rooting of Lantana camara L. and Abelia x grandiflora (Andrè) Rehd. Cuttings.…”