Estudio de la germinación y desarrollo inicial de tres especies forestales nativas del Bosque Protector Yanuncay - Irquis

Abstract

To study the germination and initial development of three native forest species (Clusia sp., Podocarpus sprucei and Viburnum triphyllum) from the Protector Yanuncay - Irquis forest, viability and imbibition tests (physical characterization) were applied, also the size of the seeds and of the embryos were quantified, the latter were classified according to their type and position (morphological characterization). Subsequently, the seeds were subjected to physical pregermination treatments (cold stratification, hot stratification) and chemical treatments (soaking in hormonal solution, acid scarification) at different immersion times. There was a significant difference (Kruskal Wallis) in the germination percentage of the three species; P. sprucei presented significant results in acid scarification for 3 minutes (62%) and cold stratification for 21 days (60%); Clusia sp., Obtained significant results so much in acid scarification during 5 and 10 minute immersion (83% and 84%), as in hot stratification at 30 ° C (89%); V. triphyllum presented significant results in the hot stratification at 30ºC (80%) and 40 ° C (82%). The seedlings obtained were monitored for two months (initial development) under greenhouse conditions (average temperature = 17°C, relative humidity = 79.86%, 12 hours light and 12 hours dark). Nonparametric tests (Kruskal Wallis) and post hoc tests (Nemenyi) were applied to identify significant differences in the variables: height, number of leaves, and seedling survival. Clusia sp., Obtained significant differences in the seeds exposed to acid scarification for 5 minutes both in height (5,7cm), number of leaves (5) and survival (100%); V. triphyllum obtained significant differences in survival; P. sprucei did not show significant differences in any of the variables studied.