Determinación De Los Patrones De Tinción Y Efecto De La Giberelina Sobre La Germinación De Las Semillas De Caoba (Swietenia Macrophylla) Y Guayacán Amarillo (Handroanthus Chrysanthus)

Abstract

The objective of the study was to determine the relationship between the percentage of germination obtained by the immersion of the seeds in different AG3 concentrations and the percentage of viable seeds according to the tetrazolium staining test, for the seeds of the forest species Caoba (S. macrophylla) and Guayacán amarillo (H. chrysanthus). The germination of the species under the effect of Gibberellic Acid (AG3) in three concentrations was evaluated; the trial was installed with an Experimental Design Simple Randomized with three repetitions, where the factor corresponded to the concentration of gibberellic acid: H2O, 50, 100 and 300 ppm, using 20 experimental units for the Swietenia macrophylla trials and 40 units experiments for Handroanthus chrysanthus. The germination analysis was carried out by means of the following variables: Germinated Seeds Percentage, Germination Average Time, Germinative Energy and Average Germination Speed. The results obtained for the two species did not show significant differences between the treatments; however, with the imbibition of the seeds of Caoba (S. macrophylla) in AG3 at 300 ppm (T3), the seeds reach their highest percentage of germination; the seeds of Guayacán amarillo (H. chrysanthus) its maximum germination to 100 ppm of AG3 (T2). The viability of the seeds, measured with the cut and stain test with 1% tetrazolium, presented an overestimation in 17% and 12% respectively, on the best treatment for the seeds of Caoba (S. macrophylla); for seeds of Guayacán amarillo (H. chrysanthus) the cut test overestimates in 31.08% the percentage of germination of the best treatment and underestimates in 8.17% the Tetrazolium test.