Advanced

The effect of high temperatures on seed germination of one native and two introduced conifers in Patagonia

Boberg, Pelle; Raffaele, Estela; Chaia, Eugenia E.; Eneström, Johanna LU ; Pettersson, Lars LU and D'Hertefeldt, Tina LU (2010) In Nordic Journal of Botany 28(2). p.231-239
Abstract
We examined the effect of thermal shock on the germination of seeds of three conifers, two introduced (Pseudotsuga menziesii and Pinus ponderosa), and one native to Patagonia (Araucaria araucana). Previous research has suggested increased susceptibility to invasions in burnt areas, and therefore, the effect of simulated fire (heat) on seed germination in these native and introduced species was compared. Seeds were heated to two different heat intensities (50 degrees C and 100 degrees C) for 1 or 5 min, which is within the temperature range reached in the upper soil layers during forest fires. Germination tests were then carried out in a growth chamber. The heat treatments had a negative effect on the germination of P. menziesii at... (More)
We examined the effect of thermal shock on the germination of seeds of three conifers, two introduced (Pseudotsuga menziesii and Pinus ponderosa), and one native to Patagonia (Araucaria araucana). Previous research has suggested increased susceptibility to invasions in burnt areas, and therefore, the effect of simulated fire (heat) on seed germination in these native and introduced species was compared. Seeds were heated to two different heat intensities (50 degrees C and 100 degrees C) for 1 or 5 min, which is within the temperature range reached in the upper soil layers during forest fires. Germination tests were then carried out in a growth chamber. The heat treatments had a negative effect on the germination of P. menziesii at temperatures of 100 degrees C, and a negative effect on the germination of P. ponderosa at the temperature of 100 degrees C and the exposure of 5 min. The heat treatments had no affect at all on A. araucana. The species with larger seeds (A. araucana) had higher survival rates after the thermal shocks. Also intraspecific differences in seed sizes possibly point at larger seeds surviving thermal shocks better than smaller seeds. In addition, thermal shock caused a delay in the onset of germination in the two introduced species, while it did not change the time for germination in A. araucana. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Nordic Journal of Botany
volume
28
issue
2
pages
231 - 239
publisher
Board of the Nordic Journal of Botany
external identifiers
  • wos:000276465700015
  • scopus:77955946846
ISSN
0107-055X
DOI
10.1111/j.1756-1051.2009.00572.x
project
BECC
language
English
LU publication?
yes
id
7bafc763-f938-4c7c-9361-1fe30788be0d (old id 1603633)
date added to LUP
2010-05-17 14:26:11
date last changed
2018-05-29 11:04:30
@article{7bafc763-f938-4c7c-9361-1fe30788be0d,
  abstract     = {We examined the effect of thermal shock on the germination of seeds of three conifers, two introduced (Pseudotsuga menziesii and Pinus ponderosa), and one native to Patagonia (Araucaria araucana). Previous research has suggested increased susceptibility to invasions in burnt areas, and therefore, the effect of simulated fire (heat) on seed germination in these native and introduced species was compared. Seeds were heated to two different heat intensities (50 degrees C and 100 degrees C) for 1 or 5 min, which is within the temperature range reached in the upper soil layers during forest fires. Germination tests were then carried out in a growth chamber. The heat treatments had a negative effect on the germination of P. menziesii at temperatures of 100 degrees C, and a negative effect on the germination of P. ponderosa at the temperature of 100 degrees C and the exposure of 5 min. The heat treatments had no affect at all on A. araucana. The species with larger seeds (A. araucana) had higher survival rates after the thermal shocks. Also intraspecific differences in seed sizes possibly point at larger seeds surviving thermal shocks better than smaller seeds. In addition, thermal shock caused a delay in the onset of germination in the two introduced species, while it did not change the time for germination in A. araucana.},
  author       = {Boberg, Pelle and Raffaele, Estela and Chaia, Eugenia E. and Eneström, Johanna and Pettersson, Lars and D'Hertefeldt, Tina},
  issn         = {0107-055X},
  language     = {eng},
  number       = {2},
  pages        = {231--239},
  publisher    = {Board of the Nordic Journal of Botany},
  series       = {Nordic Journal of Botany},
  title        = {The effect of high temperatures on seed germination of one native and two introduced conifers in Patagonia},
  url          = {http://dx.doi.org/10.1111/j.1756-1051.2009.00572.x},
  volume       = {28},
  year         = {2010},
}