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Universidad Autónoma de Nuevo León (2013)

Efecto de la temperatura en la germinación de Acacia Farnesiana y A. schaffneri de diversas procedencias y variación en vainas y semillas

Cortés Cabrera, Héctor Enrique

Titre : Efecto de la temperatura en la germinación de Acacia Farnesiana y A. schaffneri de diversas procedencias y variación en vainas y semillas.

Auteur : Cortés Cabrera, Héctor Enrique

Université de soutenance : Universidad Autónoma de Nuevo León

Grade : Maestría en Ciencias Forestales UANL, 2013.

Résumé
We studied the morphological variation of seeds and pods of 7 populations (locations) for A. farnesiana (350 to 2100 m) and 5 populations for A. schaffneri (350 to 2600 m). In germination tests also the effects of increased temperature caused by greenhouse gases germination was determined. The seeds were put to germinate at 350, 550 and 1500 m, to evaluate possible shifts in species altitudinal distribution in a scenario of climate change. We also evaluated the initial growth of the seedlings. In another experiment was simulated in a seed germinator the daily temperature variation of soil in the greatest rainfall season with the current temperature (maximum 36°C) and elevated temperatures (Max 38°C, 41°C, 43°C, 46°C and 51°C).
There were differences in the size of seeds and pods for some populations. The seeds of both species germinated equally between elevations, although there were some differences between populations. The seedlings were generally largest in stem and equal in weight in the highest elevation.
The increases in the average temperature of the soil resulted in a lower germination for the two treatments with higher temperatures independently of sources. Differences in seed weights did not influence in germination and initial growth in seedlings. In this study highlights the plasticity of the species to germinate and grow in a wide range of temperatures and elevations independently of their origin.

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Page publiée le 21 octobre 2016, mise à jour le 13 août 2017