Abstract
In this study, we evaluated the adventitious rooting competence of mini-cuttings and plantlet growth of two clones of swamp cork (Erythrina crista-galli L.). Experiments were carried out in a factorial of two clones to study the need of application of indolebutyric acid (IBA), substrate composition for mini-cutting rooting and plantlet growth, and rooting curves of the clones 15SM05 and 15SM08, in the completely randomized design. Mini-cuttings of swamp cork clones showed high rooting competence, with mean rooting percentage above 80% even without IBA application. Vermiculite and its combination with commercial substrate resulted in the highest percentage of rooting, and number and length of roots and shoots. The clones showed differences regarding their adventitious rooting competence and the increment in rooted mini-cuttings with time in a humidity chamber, being the clone 15SM05 the most suitable for plantlet production.
Highlights
Erythrina crista-galli L., commonly referred to as swamp cork, is a deciduous tree occurring in swampy or marshy floodplains, from Maranhão to Rio Grande do Sul in Brazil
Increasing the concentration of indolebutyric acid (IBA) negatively affected the percentage of rooting, while the application of 1000 mg L-1 did not differ from the control treatment
Mini-cutting rooting of swamp cork did not depend upon the IBA application
Summary
Erythrina crista-galli L., commonly referred to as swamp cork, is a deciduous tree occurring in swampy or marshy floodplains, from Maranhão to Rio Grande do Sul in Brazil. In the case of forest species, cutting or its variations (mini-cutting and microcutting), are the most used technique for mass production of plantlets This is due to the fact that vegetative propagules are produced in clonal hedges established from seminal seedlings or rooted cuttings. These aspects are more notable for exotic species, scientific and technological development in vegetative propagation by mini-cutting of native species has been improved (Pimentel et al, 2016; Rodrigues et al, 2017; Burin et al, 2018). Considering that only herbaceous mini-cuttings of swamp cork plants up to one-year-old have high rooting potential (Gratieri-Sossella et al, 2008), and no reference was found discussing factors affecting mini-cutting rooting, this research was carried out to evaluate the application need of different concentrations of indolebutyric acid (IBA) for adventitious rooting, the different substrate composition for mini-cutting rooting and plantlet growth, and the rooting curve of two swamp cork clones
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