Caracterización física y germinación de semillas de eucryphia cordifolia cav. (ulmo) y caldcluvia paniculata (cav.) d. don (tiaca) del bosque templado lluvioso, Chile.
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Date
2024
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Publisher
Universidad de Concepción
Abstract
Los bosques del sur de Chile están dentro de los 36 hotspot del mundo, han sufrido una severa degradación por perturbaciones antrópicas y cambio climático. Dentro de los compromisos suscritos por el país, están la forestación de 70 mil hectáreas de cubierta forestal permanente con especies nativas, e incorporar 1 millón de hectáreas de paisajes a procesos de restauración, sin embargo, como uno de los principales cuellos de botella para la restauración de estos ecosistemas forestales se identifica la baja disponibilidad de semillas y plantas nativas de calidad. Es por ello, que se hace necesario investigar la propagación de semillas nativas. El objetivo de este estudio, fue evaluar las características físicas y el efecto del ácido gibérelico (GA3) en las semillas de Eucryphia cordifolia y Caldcluvia paniculata de diferentes procedencias. Se realizaron análisis físicos siguiendo los estándares de la International Seed Testing Association (ISTA). Además, se aplicaron distintas concentraciones de (GA3) como tratamientos pre-germinativos para estimular la germinación de las semillas. Los resultados indican que hay diferencias en los tiempos de imbibición para ambas especies, y que existen diferencias en la viabilidad de las semillas entre las procedencias. La aplicación de ácido gibérelico acelera el proceso de germinación, pero no afecta la capacidad germinativa alcanzada al final del ensayo.
The forests of southern Chile are among the 36 hotspots in the world; they have suffered severe degradation due to anthropogenic disturbances and climate change. Among the commitments signed by the country are the afforestation of 70 thousand hectares of permanent forest cover with native species and incorporating 1 million hectares of landscapes into restoration processes, however, as one of the main bottlenecks for the restoration of these forest ecosystems, the low availability of quality seeds and native plants is identified. This is why it is necessary to investigate the propagation of native seeds. The objective of this study was to evaluate the physical characteristics and the effect of gibberellic acid (GA3) on the seeds of Eucryphia cordifolia and Caldcluvia paniculata from different origins. Physical analyzes were carried out following the standards of the International Seed Testing Association (ISTA). In addition, different concentrations of (GA3) were applied as pre-germinative treatments to stimulate seed germination. The results indicate that there are differences in imbibition times for both species, and that there are differences in seed viability between provenances. The application of gibberellic acid accelerates the germination process but does not affect the germination capacity reached at the end of the test.
The forests of southern Chile are among the 36 hotspots in the world; they have suffered severe degradation due to anthropogenic disturbances and climate change. Among the commitments signed by the country are the afforestation of 70 thousand hectares of permanent forest cover with native species and incorporating 1 million hectares of landscapes into restoration processes, however, as one of the main bottlenecks for the restoration of these forest ecosystems, the low availability of quality seeds and native plants is identified. This is why it is necessary to investigate the propagation of native seeds. The objective of this study was to evaluate the physical characteristics and the effect of gibberellic acid (GA3) on the seeds of Eucryphia cordifolia and Caldcluvia paniculata from different origins. Physical analyzes were carried out following the standards of the International Seed Testing Association (ISTA). In addition, different concentrations of (GA3) were applied as pre-germinative treatments to stimulate seed germination. The results indicate that there are differences in imbibition times for both species, and that there are differences in seed viability between provenances. The application of gibberellic acid accelerates the germination process but does not affect the germination capacity reached at the end of the test.
Description
Tesis presentada para optar al título de Ingeniero Forestal
Keywords
Morfología vegetal, Germinación, Árboles Semillas