Abstract
Abstract The sector that ranges from cultivation to sale of ornamental species is highlighted in the agribusiness scenario, due to the frequent increase in demand for its products. This importance encourages the exploration of new technologies that allow the development of protocols for the multiplication of species of commercial interest. Thus, the objective of this study was to evaluate and validate the use of girdling, ethephon and the selection of degree of branch maturation as techniques for increasing the establishment of cuttings of Rhododendron simsii Planch. The treatments combining the three study factors were applied to the branches of the parent plants: two levels of girdling (with and without), two levels of application of ethephon at the concentration of 900 mg L-1 (with and without application) and two degrees of maturation (woody and herbaceous). It was found that the presence of branch girdling increased the rate of establishment of cuttings by 43.75%, while the joint use of two techniques, the application of ethephon and the selection of herbaceous cuttings, resulted in an establishment rate 56.25% higher than the average of other treatments. Thus, it can be concluded that both branch girdling and the application of ethephon combined with the use of herbaceous branches can be used as techniques for the greater establishment of cuttings of Rhododendron simsii Planch.
Highlights
Azalea (Rhododendron simsii Planch.) is an ornamental plant in the Ericaceae family, originating in Asia (Shrestha et al, 2018) and widely cultivated in Brazil (Bezerra et al, 2020)
The combined use of two techniques- the application girdling,ethefon and the degree of maturation of the cuttings. of ethephon and the selection of herbaceous cuttings in branch girdling had an isolated effect, and there was azalea- resulted in an establishment rate 56.25% higher an interaction between ethephon application and the maturation than the average of the other treatments (Figure 2)
Similar results have been reported by Dhua et al (1982), It was found that the presence of branch girdling applying ethephon to guava branches (Psidium guajava increased the establishment of azalea cuttings by 43.75% L.), collecting herbaceous cuttings (from the ends of the (Figure 1), characterized by the joint development of root branches) after seven days, treating or not treating plants structures and shoots
Summary
Azalea (Rhododendron simsii Planch.) is an ornamental plant in the Ericaceae family, originating in Asia (Shrestha et al, 2018) and widely cultivated in Brazil (Bezerra et al, 2020). In landscaping, this shrub is commonly used in pots, as well as in gardens, as an isolated plant or as the constituting elements of borders, rows and massifs. The propagation of azalea can be sexual or, more commonly, asexual, because of the genetic heterogeneity observed in the seeds (Zaytseva and Novikova, 2018). Stem cuttings are used to propagate most Rhododendron species (Eeckhaut et al, 2009). Its rooting is often difficult, with a small percentage of catching and, low seedling production (Lone et al, 2010; Li et al, 2017)
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