%0 Journal Article %1 citeulike:2305766 %A Buchner, O. %A Neuner, G. %D 2003 %J Arctic, Antarctic, and Alpine Research %K altitude, citeulikeExport heat, hydraulics, temperature, tolerance %N 4 %P 411--420 %T Variability of Heat Tolerance in Alpine Plant Species Measured at Different Altitudes %U http://www.jstor.org/stable/1552341 %V 35 %X We monitored variability of heat tolerance, osmotic water potential, and microclimate for seven alpine plant species at field sites and in response to a controlled in situ heat treatment (+3 K) using infrared lamps. Mean and maximum heat tolerance differed significantly between species and were clearly related to growth form and moisture conditions in the preferred microhabitat. Diurnal heat tolerance changes greater than +-1.5 K occurred on 18heat tolerance amplitude ranged from 4.8 to 9.5 K, exceeding even the seasonal amplitudes (5-8 K) previously reported for other higher plant species. Heat tolerance increased under warmer microsite conditions and in warmer years. Long-term artificial heating by +3 K led to a significant (P &\#62; 0.01) increase in heat tolerance by +0.6 K. Under drought stress, heat tolerance was reduced to minimum values, with the exception of xerophytic species. The plant species investigated appeared to be very well adapted to the temperature conditions of their microhabitat, with the exception of the cushion plant Minuartia recurva, which recurrently experienced heat damage during the investigation.

@article{citeulike:2305766, abstract = {{We monitored variability of heat tolerance, osmotic water potential, and microclimate for seven alpine plant species at field sites and in response to a controlled in situ heat treatment (+3 K) using infrared lamps. Mean and maximum heat tolerance differed significantly between species and were clearly related to growth form and moisture conditions in the preferred microhabitat. Diurnal heat tolerance changes greater than +-1.5 K occurred on 18heat tolerance amplitude ranged from 4.8 to 9.5 K, exceeding even the seasonal amplitudes (5-8 K) previously reported for other higher plant species. Heat tolerance increased under warmer microsite conditions and in warmer years. Long-term artificial heating by +3 K led to a significant (P \&\#62; 0.01) increase in heat tolerance by +0.6 K. Under drought stress, heat tolerance was reduced to minimum values, with the exception of xerophytic species. The plant species investigated appeared to be very well adapted to the temperature conditions of their microhabitat, with the exception of the cushion plant Minuartia recurva, which recurrently experienced heat damage during the investigation.}}, added-at = {2019-03-31T01:14:40.000+0100}, author = {Buchner, O. and Neuner, G.}, biburl = {https://www.bibsonomy.org/bibtex/2249b36d041a7b446579a7ddc5c790d87/dianella}, citeulike-article-id = {2305766}, citeulike-linkout-0 = {http://www.jstor.org/stable/1552341}, comment = {(private-note)Prostrate growth forms such as rosettes of S. paniculata, cushions, and dwarf shrubs tolerate significantly higher temperatures than herbs and tall R. ferrugineum shrubs. This evidently mirrors the growth form–specific differences in leaf temperature climate. In addition, species on dry sites have a higher heat tolerance than species that occupy permanently moist sites, allowing a greater transpirational cooling. Even a south-facing individual of R. glacialis experienced a maximum leaf temperature of only 34.88C because it grew on moist soils that did not restrict transpiration.}, interhash = {8aa126081821c759ae5db90ecffed718}, intrahash = {249b36d041a7b446579a7ddc5c790d87}, journal = {Arctic, Antarctic, and Alpine Research}, keywords = {altitude, citeulikeExport heat, hydraulics, temperature, tolerance}, number = 4, pages = {411--420}, posted-at = {2008-01-30 03:01:29}, priority = {2}, timestamp = {2019-03-31T01:16:26.000+0100}, title = {{Variability of Heat Tolerance in Alpine Plant Species Measured at Different Altitudes}}, url = {http://www.jstor.org/stable/1552341}, volume = 35, year = 2003 }