Establishment of propagation methods for growing promising aromatic plant species of the Lippia (Verbenaceae) and Tagetes (Asteraceae) genera in Colombia
Axel Mauricio Herrera-Moreno | Carlos Edwin Carranza | María Isabel Chacón-Sánchez
The objective of this study was to evaluate methods of asexual propagation with stem cuttings in the aromatic plant species Lippia origanoides (accessions CA-90 and CA-93), Lippia alba (accession CA-300) and Tagetes zypaquirensis (accession CA-247) and determine the germination behavior of Tagetes caracasana (accession CA-10), in order to contribute to the establishment of these promising aromatics as potential new crops in Colombia. The factors evaluated were the substrate (fine coconut fiber (FCF); fine coconut fiber: coal slag 1:1 (FCFCS); fine coconut fiber: coal slag: river sand 1:1:1 (FCFCSRS ) and IBA hormone concentration (0, 2,000 and 4,000 mg L-1). Germination tests of seeds of the accession CA-10 were carried out in Petri dishes with 50 seeds per dish, with three replicates in controlled conditions and constant temperature (25°C), humidity (90%) and total darkness. In general, the accessions CA-90, CA-93, CA-300 and CA-247 showed better rooting percentage, root length, number of roots and root dry weight in the fine coconut fiber substrate and a higher number of roots with an exogenous application of 2,000 mg L-1 IBA. L. alba and T. zypaquirensis responded better than L. origanoides to the treatments. The latter species showed a relatively poor performance and may require more complex and improved propagation methods to obtain more satisfactory results. T. caracasana seeds had a relatively short germination time (less than three weeks) and relatively high germination under controlled laboratory and greenhouse conditions (70 and 60%, respectively); these percentages are high relative to wild species of the same genus, meaning this method of seed propagation is appropriate for this wild species
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