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Evidence for recent evolution of cold tolerance in grasses suggests current distribution is not limited by (low) temperature
Stockholm University, Faculty of Science, Department of Ecology, Environment and Plant Sciences. Division of Biology, Imperial College London, Silwood Park Campus, Berkshire, UK.
2013 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 198, no 4, 1261-1273 p.Article in journal (Refereed) Published
Abstract [en]

Temperature is considered an important determinant of biodiversity distribution patterns. Grasses (Poaceae) occupy among the warmest and coldest environments on earth but the role of cold tolerance evolution in generating this distribution is understudied. We studied cold tolerance of Danthonioideae (c. 280 species), a major constituent of the austral temperate grass flora. We determined differences in cold tolerance among species from different continents grown in a common winter garden and assessed the relationship between measured cold tolerance and that predicted by species ranges. We then used temperatures in current ranges and a phylogeny of 81% of the species to study the timing and mode of cold tolerance evolution across the subfamily. Species ranges generally underestimate cold tolerance but are still a meaningful representation of differences in cold tolerance among species. We infer cold tolerance evolution to have commenced at the onset of danthonioid diversification, subsequently increasing in both pace and extent in certain lineages. Interspecific variation in cold tolerance is better accounted for by spatial than phylogenetic distance. Contrary to expectations, temperature low temperature in particular appears not to limit the distribution of this temperate clade. Competition, time or dispersal limitation could explain its relative absence from northern temperate regions.

Place, publisher, year, edition, pages
2013. Vol. 198, no 4, 1261-1273 p.
Keyword [en]
cold tolerance, Danthonioideae, distribution, frost tolerance, grasses, niche evolution, Poaceae, temperature
National Category
URN: urn:nbn:se:su:diva-91036DOI: 10.1111/nph.12244ISI: 000318634400027OAI: diva2:630567


Available from: 2013-06-19 Created: 2013-06-18 Last updated: 2013-06-19Bibliographically approved

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Humphreys, Aelys M.
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Department of Ecology, Environment and Plant Sciences
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