Document


Title

No heat-stimulated germination found in herbaceous species from burned subtropical grassland
Document Type: Journal Article
Author(s): G. E. Overbeck; S. C. Muller; V. D. Pillar; J. Pfadenhauer
Publication Year: 2006

Cataloging Information

Keyword(s):
  • adaptation
  • Andropogon lateralis
  • Asteraceae
  • Brazil
  • Cyperaceae
  • ecosystem dynamics
  • Elionurus
  • Eryngium
  • fire adaptations (plants)
  • fire frequency
  • fire intensity
  • fire management
  • forbs
  • germination
  • germination
  • grasses
  • grasslands
  • grasslands
  • heat
  • heat effects
  • heat shock
  • herbaceous vegetation
  • Mediterranean habitats
  • Poaceae
  • range management
  • seed dormancy
  • seed germination
  • seeds
  • shrublands
  • smoke effects
  • South America
  • southern Brazil
  • temperature
  • wood
Region(s):
  • International
Record Maintained By:
Record Last Modified: June 1, 2018
FRAMES Record Number: 48218
Tall Timbers Record Number: 24298
TTRS Location Status: In-file
TTRS Call Number: Fire File
TTRS Abstract Status: Okay, Fair use, Reproduced by permission

This bibliographic record was either created or modified by the Tall Timbers Research Station and Land Conservancy and is provided without charge to promote research and education in Fire Ecology. The E.V. Komarek Fire Ecology Database is the intellectual property of the Tall Timbers Research Station and Land Conservancy.

Description

Fire has been shown to stimulate seed germination in a number of fire-prone ecosystems, mainly in Mediterranean type shrublands and, though not exclusively, in hardseeded species. Stimulation by heat, or by chemical constituents of charred wood and smoke, have been identified as the main mechanisms breaking dormancy of soil-stored seeds. In this study, we experimentally tested the effect of heat on germination rates of nine herbaceous species (5 grasses, 1 Cyperaceae, 3 forbs) from frequently burned grassland in southern Brazil. Seeds were exposed to temperatures between 50ºC and 110ºC (to 180ºC for two species) for 2 min. Germination of treated seeds was monitored in a germination chamber. The heat treatments did not stimulate germination in any of the species tested. Tolerance of seeds to heat varied between species. Two of the herbs and the three grasses with the smallest seeds were able to germinate at temperatures of 110ºC, or even higher. Apparently, no mechanisms directly stimulating germination by heat have developed in herbaceous species from southern Brazil. However, survival of high temperatures can be considered to be an adaptation to fire, possible allowing for increased germination in the post-burn environment. © Springer 2005. Abstract reproduced by permission.

Online Link(s):
Citation:
Overbeck, G. E., S. C. Muller, V. D. Pillar, and J. Pfadenhauer. 2006. No heat-stimulated germination found in herbaceous species from burned subtropical grassland. Plant Ecology, v. 184, no. 2, p. 237-243. 10.1007/s11258-005-9068-1.