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Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass

Citation

Hovenden, MJ and Wills, KE and Chaplin, RE and Vander Schoor, JK and Williams, AL and Osanai, Y and Newton, PCD, Warming and elevated CO2 affect the relationship between seed mass, germinability and seedling growth in Austrodanthonia caespitosa, a dominant Australian grass, Global Change Biology, 14, (7) pp. 1633-1641. ISSN 1354-1013 (2008) [Refereed Article]

DOI: doi:10.1111/j.1365-2486.2008.01597.x

Abstract

While the influence of elevated CO2 on the production, mass and quality of plant seeds has been well studied, the effect of warming on these characters is largely unknown and there is practically no information on possible interactions between warming and elevated CO2, despite the importance of these characters to population maintenance and recovery. Here we present the impacts of elevated CO2 and warming, both in isolation and combination, on seed production, mass, quality, germination success and subsequent seedling growth of Austrodanthonia caespitosa a dominant temperate C3 grass from Australia, using seeds collected from the TasFACE experiment. Mean seed production and mass were not significantly affected by either elevated CO2 or warming but elevated CO2 more than doubled the proportion of very light, inviable seeds (P<0.05) and halved mean seed N concentration (P<0.04) and N content (P<0.03). The dependence of seed germination success on seed mass was affected by an elevated CO2  warming interaction (P<0.004), such that maternal exposure to elevated CO2 or warming reduced germination if applied in isolation but not when applied in combination. Maternal effects were retained when seedlings were grown in a common environment for six weeks, with seedlings descended from warmed plants 20% smaller (P<0.008) with a higher root:shoot ratio (P<0.001) than those from unwarmed plants. Given that both elevated CO2 and warming reduced seed mass, quality, germinability or seedling growth, it is likely that global change will reduce population growth or distribution of this dominant species.

Item Details

Item Type:Refereed Article
Keywords:FACE, elevated CO2, climate change, global warming, grassland, demography, seed, germination, maternal influences.
Research Division:Environmental Sciences
Research Group:Ecological Applications
Research Field:Ecological Impacts of Climate Change
Objective Division:Environment
Objective Group:Climate and Climate Change
Objective Field:Climate Change Adaptation Measures
Author:Hovenden, MJ (Associate Professor Mark Hovenden)
Author:Wills, KE (Dr Karen Wills)
Author:Vander Schoor, JK (Mrs Jacqueline Vander Schoor)
Author:Williams, AL (Ms Amanda Williams)
Author:Osanai, Y (Ms Yui Osanai)
ID Code:54935
Year Published:2008
Web of Science® Times Cited:38
Deposited By:Plant Science
Deposited On:2009-03-03
Last Modified:2009-05-16
Downloads:0

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