Abstract
ABSTRACT Psidium cattleianum Sab., from Mirtaceae family, commonly known as araçá, is a native species form the South of Brazil, present in biomes such as the Atlantic Forest, a deciduous forest of Brazilian cerrado, strongly affected by the expansion of areas for agricultural and industrial production. Researches on plant breeding area, nutraceuticals and other areas have validated its potential and it detaches the need to promote it on a commercial scale. Mechanisms, that allow exploiting its genetic potential while maintaining its conservation areas, require adjustment in cloning techniques for fixing interest characteristics. In this investigation, seedlings of leaf cutting and young branch were assessed, with three treatments in leaf cutting (H2PO4 0.2 gL-1, AIB 100 mg L-1 and AIB and powder-based applied over cutting region). Moreover, leaf cuttings of five cm length and the two leaves were treated with AIB (0, 1,500, 3,000 and 6,000 mg L-1) in the absence and presence of BAP (500 mg L-1). Treatment with AIB (powder) in leaf cuttings showed higher survival of leave; however, there were callus formation, especially compared to other treatments of H2PO4 and AIB that showed average rooting percentage of 18%. In plant cuttings, there were no significant difference for the variables evaluated between AIB doses; however, the use of cytokinin (BAP 500 mg L-1) was inhibitory. There was no difference at rooting percentage (98%) without treatment with regulator, maintaining similar with BAP doses.
Highlights
The conservation of biodiversity allows the great mass of chemical compounds, genetic resources and other benefits of terrestrial species are available to provide solutions to existing problems and those that are yet to be discovered (WILLIAMS et al, 2001)
Leaf cuttings of five cm length and the two leaves were treated with AIB (0, 1,500, 3,000 and 6,000 mg L-1) in the absence and presence of BAP (500 mg L-1)
Quadros (2009), in the propagation of plant cuttings of Ilex paraguariensis observed a positive correlation between the percentage of callus formation and survival; Figure 1 – Cut detail of P. cattleianum leaf cuttings. thirty days after the establishment for root induction: a. callus formation. b. root formation, UFRGS, Porto Alegre, 2016
Summary
The conservation of biodiversity allows the great mass of chemical compounds, genetic resources and other benefits of terrestrial species are available to provide solutions to existing problems and those that are yet to be discovered (WILLIAMS et al, 2001). Psidium cattleianum Sabine is considered one of the native fruit species of Southern Brazil of great potential interest for its fruit, and ornamental, pharmaceutical and nutraceutical use, besides the environmental interest for its high production of fruits and seeds, considered another interesting feature from environmental point of view to the use in the recovery of native fauna and flora in deforested areas of the Atlantic Forest. As P. cattleianum is still a native species of little research, there are no programs to reduce the genotypic variability within a population necessary for its commercial advantage. In order preserve the homogenous agricultural characteristics, asexual propagation is an alternative. As a source of explants, it mainly uses cuttings, depending on plant area that may be apical, intermediate or radicular, ranging on explants characteristics. Propagation by cuttings has been researched and used in woody species such, as Pinus spp. Propagation by cuttings has been researched and used in woody species such, as Pinus spp. (ANDREJOW; HIGA, 2009; ALCANTARA et al, 2007), Eucaliptus spp. (NAVARRETE and VARGAS, 2005), Psidium guajava (ZIETEMANN; ROBERTO, 2007) and ornamental (KÄMPF, 2005)
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