Cutting Type and IBA Treatment Duration Affect <i>Teucrium fruticans</i> Adventitious Root Quality

Abstract

Root development of stem cuttings of Silver Germander (Teucrium fruticans) was investigated in relation to cutting type and indole-3-butyric acid (IBA) treatment. Terminal cuttings of a clone grown in Sicily were trimmed to three types: terminal cuttings with apex (TWA), terminal cuttings without apex (TWOA) or sub-terminal cuttings (ST). To verify the cutting response to exogenous auxin, cuttings were dipped to a 2.0 cm depth in a 0.5% indole-3-butyric acid solution for 0, 5 or 7 minutes. Overall percent survival was 97 to 98%. Rooting percent, root number and root length were affected by cutting type and indole-3-butyric acid treatment. In general, TWA cuttings demonstrated a higher capacity to form roots than cuttings without apex (TWOA and ST cuttings). In absence of indole-3-butyric acid treatment, TWA and ST cuttings gave higher rooting percentages than TWOA cuttings. Exposing cuttings to indole-3-butyric acid improved percent rooting, number of roots per cutting and root length. The best results in terms of rooting percentage and root number per cuttings were obtained with TWA cuttings in combination with 7 min indole-3-butyric acid basal dip. However, cuttings taken farther down the stem, such as sub-terminal cuttings gave satisfactory rooting performance as well. We suggest that the use of all cutting types tested associated to indole-3-butyric acid basal dip for 5 or 7 min may be beneficial to propagators wishing to produce T. fruticans rooted cuttings with well-developed root system.

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’

“…Cutting success, entailing quality AR formation 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 [17,71,72]. IBA has been reported to increase in vivo adventitious root formation, overall quality and uniformity of roots in many ornamental species [73][74][75][76][77][78][79][80][81][82]. Untreated stem cuttings (C0) were also able to root, but with a lower rooting percentage, in comparison to IBA-treated cuttings, possibly due to the presence of stored carbohydrates and endogenous auxin contents in the cuttings [83].…”

Influence of indole butyric acid on root and shoot growth in dragon fruit (Hylocereus undatus) stem cuttings

“…IBA plays significant role in enhancing rooting process (root hair elongation, later root development and formation of adventitious roots) by involving in physiological process of cell division, cell enlargement and interaction with other hormones through different mechanisms (Zimmerman and Wilcoxon, 1935;Gehlot et al, 2014). Madhavan et al (2021), Sabatino et al (2014), Rahbin et al (2012) and Shiri et al (2019) reported enhancement of root length with the use of IBA in grapes, night jessamine (Cestrum nocturnum), silver germander (Teucrium fruticans) and Duranta errecta respectively. In Dragon fruit, Seran and Thiresh (2015) observed longest root length in cutting treated with 8000 ppm and 6000 ppm IBA.…”

“…no IBA (Table 5). IBA is effective in enhancing rooting percentage; root length thus ultimately causes enhanced root biomass in plants (Sabatino et al, 2014;Madhavan et al, 2021). Further, higher rooting and dipper roots may results in higher absorption of nutrients from the soil which results in better root growth.…”

Improved Propagation and Growing Techniques for Oleander Nursery Production

“…In our study, the application of IBA improved rooting percentage and root number as compared to untreated control. IBA has been reported to increase in vivo and in vitro adventitious root formation in many species, including vegetables, perennials, and ornamental shrubs [15][16][17][18][19][20][21][22][23][24][25][26].…”