SciELO - Scientific Electronic Library Online

 
vol.20 issue3GUINEA GRASS AND ITS EFFECTS ON THE INITIAL GROWTH OF Eucalyptus × urograndis CLONESPOPULATION STRUCTURE OF Myrocarpus frondosus Allemão IN A RIPARIAN AREA OF THE PARANAENSE FOREST IN MISIONES, ARGENTINA author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

Share


Ciência Florestal

Print version ISSN 0103-9954On-line version ISSN 1980-5098

Abstract

MANTOVANI, Nilton César; GRANDO, Magali Ferrari; XAVIER, Aloisio  and  OTONI, Wagner Campos. VEGETATIVE RESCUE OF ADULT GENOTYPES OF ANNATTO (Bixa orellana L.) BY AIR LAYERING. Ciênc. Florest. [online]. 2010, vol.20, n.3, pp.403-410. ISSN 0103-9954.  http://dx.doi.org/10.5902/198050982055.

This study aimed to evaluate the usefulness of an air layering technique for vegetative rescue of annatto (Bixa orellana L.) genotypes and obtainment of propagules for vegetative propagation. Ten 12 year-old annatto stock plants, whose genotypes are derived from artificial crossing between “Hairy-green capsule” X “Smooth-red capsule” were used in this study. Air layering adventitious roots were induced in branches (1-2 cm diameter) using as substrate a mixture of vermiculite and moss. The effects of (1) the type of girdling (total or partial), 1 cm in length, (2) IBA (indole-3-butyric acid at 0 and 4.92 mM) solution in paper filter and (3) the covering with either transparent or dark plastic films and tencel were evaluated. The technique of air layering provided rooted branches for the 10 genotypes evaluated, with efficiency ranging from 20 to 100%, and a genotype effect was observed on rooting frequency. Under greenhouse conditions, the survival of layers derived from totally girdled stems treated with IBA and protected with transparent plastic was 100%. Established layers provided vigorous branching from which shoot apexes or nodal segment explants were obtained for in vitro establishment and propagation of this species.

Keywords : axillary shoots; rooting; indol-3-butyric acid.

        · abstract in Portuguese     · text in Portuguese     · Portuguese ( pdf )