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Universidad Autónoma de Nuevo León (UANL) 2012

Germinación de semillas de especies nativas de los pastizales del altiplano del norte de México

Contreras Quiroz, Mariana del Rocío

Titre : Germinación de semillas de especies nativas de los pastizales del altiplano del norte de México

Auteur : Contreras Quiroz, Mariana del Rocío

Université de soutenance : Universidad Autónoma de Nuevo León (UANL)

Grade : Maestria en Ciencias Forestales 2012

Résumé
Germination is a crucial process in the life cycle of plants ; trough the knowledge and management of this process we may have the possibility to reproduce and rescue the plant species of interest, mainly those endangered or vulnerable. Hence, in this study, I evaluated germination of 10 species native of the Northern Mexican Plateau to classification three germinability categories, percentage of germination and rate of germination (t50). I evaluated : i) mechanically scarified seeds, and ii) seed without scarification. In both cases, seeds were exposed to two different temperatures : 26° y 30° C in a seed germination chamber, with and without fungicide treatment, giving a total of eigth treatments, with five replicates, all on constant humidity. Data were analyzed by means of ANOVA and Tukey test for comparison of germination percentage between temperatures, scarification and fungicide treatment for each species. Frankenia gypsophila showed a higher germination percentage at 26°C, while Machaeranthera pinnatifida did it at 30°C. For the fungicide treatment, only Sartwellia mexicana showed statistical differences having a higher germination without fungicide. Scarification treatment increased germination for Machaeranthera pinnatifida y Atriplex canescens seed species ; however, this treatment negatively affected germination of Frankenia gypsophila seeds. Dominant germinability categories were low : Sartwellia mexicana, Machaeranthera pinnatifida and Atriplex canescens, and high : Frankenia gypsophila and Muhlenbergia arenícola ;, while rates of germination were fast : : Frankenia gypsophila and Muhlenbergia arenícola, and moderate : Sartwellia mexicana and Atriplex canescens. No statistical differences were found for t50 values although Muhlenbergia arenicola had the highest germination rate for both temperatures (2.5±0.51 at 26°C and 2.35±0.34 at 30 °C). This kind of information can be highly relevant for management and seed reproduction of these native species of the Mexican arid and semiarid zones.

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