INVESTIGADORES
GHERMANDI luciana
artículos
Título:
Fire cue effects on seed germination of six species of NW Patagonian grasslands
Autor/es:
GONZALEZ S. & L. GHERMANDI
Revista:
NATURAL HAZARDS AND EARTH SYSTEM SCIENCES
Editorial:
COPERNICUS PUBLICATIONS
Referencias:
Año: 2012 vol. 12 p. 2753 - 2758
ISSN:
1561-8633
Resumen:
Abstract. Postfire recruitment of seedlings has been
attributed to a stimulation of germination by fire-related cues.
The germination response to heat shock (80 C ? 5 min),
smoke (60 min), the combination of both factors and no
heat no smoke (control) was studied in six native species
(two dominant grasses, two dominant shrubs and two annual
fugitive herbs) of northwestern Patagonian grasslands. Seeds
of the grasses Festuca pallescens and Stipa speciosa and the
shrub Senecio bracteolatus (Asteraceae) germinated when
they were exposed to heat shock, whereas seeds of the other
shrub, Mulinum spinosum (Apiaceae), were killed by this fire
cue. In grasses, probably the glume of caryopsis protected
embryos from heat. Possibly, the seed size could explain
the different responses of the two shrubs. Heat combined
with smoke reduced seed germination for S. speciosa and
S. bracteolatus. The heat could have scarified seeds and the
longer exposure to smoke could have been toxic for embryos.
The same treatment increased germination of the annual
fugitive herb Boopis gracilis (Calyceraceae). We concluded
that fire differentially affects the seedling recruitment of the
studied species in the northwestern Patagonian grasslands