Effect of different substrates and auxins on rooting of Leucadendron sp. (Proteaceae)

Abstract

Colombian flower growers are faced with economic and social problems, so they are looking for alternatives, which include Proteas, ornamentals that require research that ensures an appropriate, local technical management. One of the Proteas most likely to be involved in this search is the genus Leucadendron. Therefore, this study aimed to establish the best basis for rooting its cuttings. The experimental design was a split plot design with a factorial arrangement. Four substrates were evaluated in combination with two auxins, naphthaleneacetic acid (NAA) and indolebutiric acid (IBA), three doses each, plus a commercial control. Each treatment was repeated three times and the experimental unit consisted of 30 stakes at the first locality and 25 at the second one. The most relevant results showed that vermiculite was the best substrate for rooting cuttings of Leucadendron at both localities. Also, it was identified that IBA is the growth regulator which improved the rooting percentage, the root volume, the stem decreased the percentage of losses.

Influence of Rooting Media and Indole-3-Butyric Acid (Iba) Concentration on Rooting and Growth of Different Types of Conocarpus Erectus L. Stem Cuttings

“…These results are in accordance with those obtained by Rajkumar et al (2016), Manila et al (2017) and Peña- Baracaldo et al (2018), who observed that vermiculite substrate was the best rooting medium in increasing the rooting percentage of many species cuttings than the other substrates. The main reasons in increasing the rooting percentage of C. erectus cuttings under vermiculite medium may be due to better aeration, excellent drainage, more water holding capacity and release of nutrients gradually from vermiculite medium resulting in better rooting percentages (Ansari, 2013;Manila et al, 2017).…”

“…However, the lowest root and vegetative characteristics were recorded with clay medium. Several investigations have shown that the use of vermiculite as rooting media resulted in a considerable increase in root and vegetative characteristics of cuttings Manila et al, 2017;Peña-Baracaldo et al, 2018). The positive effect of vermiculite substrate in increasing the root and shoot characteristics of cuttings may be attributed to its role on improving the soil aeration resulting in high water retention capacity and more availability of nutrients to roots (Rajkumar et al, 2017;Kumar et al, 2019).…”

“…Several studies have indicated the positive effects of vermiculite, peat, perlite and sand in improving the rootability of cuttings (Ansari, 2013;Rajkumar et al, 2017;Jaleta and Sulaiman, 2019). Vermiculite has been found to considerably enhance the rooting and growth of cuttings in many species, especially when combined with IBA or NAA treatments compared to the other rooting media (Hosseini et al, 2004;2016;Peña-Baracaldo et al, 2018). On the other hand, the combination of peat moss with perlite or sand is suitable for rooting and growth of cuttings in some plants compared to the other rooting media (Tsipouridis et al, 2005;Exadaktylou et al, 2009;Jaleta and Sulaiman, 2019).…”

“…Exogenous auxins application, mainly IBA plays a crucial role in enhancing of rooting efficiency and also quality of stem cuttings in nurseries (Peña-Baracaldo et al, 2018;Kumar et al, 2019). However, it was observed that the type and concentration of exogenous auxins applied play an important role in rooting and growth of cuttings depending on plant species (Hartmann et al, 2014;Daskalakis et al, 2018).…”

Effect of substrate and naftalenacetic acid on vegetative propagation Hypericum brasiliense (Hypericacaceae)

“…Además, esta técnica podría emplearse para la domesticación y conservación de especies medicinales (Feria-Arroyo et al, 2010;Duarte et al, 2018). Sin embargo, el proceso de enraizamiento de estacas está regulado por una combinación óptima de procesos fisiológicos (aspectos relacionados a la calidad, edad, tipo y estado fitosanitario de las estacas), condiciones ambientales (humedad del ambiente y características del sustrato), características genotipo de la planta madre y condiciones de propagación (Castillo-Flores et al, 2013;Peña-Baracaldo et al, 2018;Bannoud & Bellini, 2021). Entre las condiciones ambientales y de propagación que se pueden manipular con facilidad para hacer más eficiente el desarrollo de raíces adventicias se destacan la composición del sustrato, el tipo y dosis de hormona, que si no se emplean de manera apropiada pueden limitar altamente la obtención de rizogénesis adventicia.…”