Requerimientos germinativos de enredaderas características del Chaco Serrano de Córdoba, Argentina

 

Authors
D’Agostino, Anahí Belén; Ezequiel Gurvich, Diego; Ferrero, María Cecilia; Rodolfo Zeballos, Sebastián; Funes, Guillermo
Format
Article
Status
publishedVersion
Description

Germinating requirements of common vines from Chaco Serrano of Córdoba, Argentina. Vines are conspicuous elements of floras in different ecosystems. Patterns of distribution and ecology of this group has been studied at regional scales, mainly in tropical areas, but less is known about factors affecting their distribution at smaller scales. In this study, the germinating requirements of common vines from two plant communities (open shrubland and woodland) in xerophytic mountain forests (Chaco serrano) were studied. A total of 21 species were selected and classified as typical of woodland, shrubland, or indifferent. Experimental treatments were three temperature regimes (15-5oC, 25-15oC and 35-20oC), in light (12-12h daily photoperiod) and in continuous darkness. Total germination percentage, the relative light germination (RLG) and germina- tion rate (T50) were recorded. Among results we found that the temperature was the main factor triggering the germination process. No differences in the mean RLG and T50 between woodland and shrubland patches were found. The patterns observed in this work support the idea that, independently of patch type, germination is associated with temperature of the time of the year when most of the rainfall occurs. Germination of the studied species would be responding to macroclimate’s factors (seasonality of climate and rainfall), rather than to a microclimate. This indicates that differences in species composition between patches would not be due to the factors studied, rather than to characteristics of the later stages of the cycle life.
Las enredaderas son elementos conspicuos de la flora de diferentes ecosistemas. Numerosos estudios basa- dos en patrones de distribución y ecología de este grupo de plantas se han realizado a escala regional, se conoce poco sobre los factores que afectan su distribución a nivel local. Se estudiaron los requerimientos germinativos de 21 enredaderas del Bosque chaqueño serrano de Córdoba, las cuales fueron clasificadas en típicas de bosques, matorrales e indiferentes. Se llevaron a cabo experimentos de germi- nación en tres regímenes de temperatura (15-5oC, 25-15oC y 35-20oC), en luz (12-12hr luz-oscuridad) y oscuridad permanente. Se registró el porcentaje final de germinación, el índice de germinación relativa a la luz (GRL) y la velo- cidad de germinación (T50). La temperatura fue el principal factor regulador del proceso germinativo. El GRL y el T50 no registraron diferencias entre fisonomías. Los patrones observados apoyan la idea de que la germinación de este grupo de plantas estaría respondiendo a factores macro- climáticos (estacionalidad del clima y las precipitaciones), más que a un microclima (factores asociados a la fisonomía del sitio). La composición diferencial de enredaderas en los parches de bosques y arbustos no estaría explicada por los factores estudiados, sino por características de las etapas posteriores a la semilla.

Publication Year
2012
Language
Español
Topic
chaco forests
vines
seed germination
temperature
light
chaco serrano
características regenerativas
enredaderas
semillas
temperatura
luz
Fuente
Portal de Revistas UCR
Get full text
https://revistas.ucr.ac.cr/index.php/rbt/article/view/2069
Derechos
openAccess
Licencia