DOI: 10.1111/gcb.13971
Scopus记录号: 2-s2.0-85036557793
论文题名: Elevated carbon dioxide and warming impact silicon and phenolic-based defences differently in native and exotic grasses
作者: Johnson S.N. ; Hartley S.E.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期: 9 起始页码: 3886
结束页码: 3896
语种: 英语
英文关键词: defences
; grasses
; herbivores
; phenolic acids
; silica
; silicon
; stress
; trade-offs
Scopus关键词: carbon dioxide
; climate change
; defense mechanism
; global climate
; grass
; herbivore
; invasive species
; native species
; phenolic compound
; silica
; silicon
; warming
; Microlaena stipoides
; Poaceae
英文摘要: Global climate change may increase invasions of exotic plant species by directly promoting the success of invasive/exotic species or by reducing the competitive abilities of native species. Changes in plant chemistry, leading to altered susceptibility to stress, could mediate these effects. Grasses are hyper-accumulators of silicon, which play a crucial function in the alleviation of diverse biotic and abiotic stresses. It is unknown how predicted increases in atmospheric carbon dioxide (CO2) and air temperature affect silicon accumulation in grasses, especially in relation to primary and secondary metabolites. We tested how elevated CO2 (eCO2) (+240 ppm) and temperature (eT) (+4°C) affected chemical composition (silicon, phenolics, carbon and nitrogen) and plant growth in eight grass species, either native or exotic to Australia. eCO2 increased phenolic concentrations by 11%, but caused silicon accumulation to decline by 12%. Moreover, declines in silicon occurred mainly in native species (−19%), but remained largely unchanged in exotic species. Conversely, eT increased silicon accumulation in native species (+19%) but decreased silicon accumulation in exotic species (−10%). Silicon and phenolic concentrations were negatively correlated with each other, potentially reflecting a defensive trade-off. Moreover, both defences were negatively correlated with plant mass, compatible with a growth-defence trade-off. Grasses responded in a species-specific manner, suggesting that the relative susceptibility of different species may differ under future climates compared to current species rankings of resource quality. For example, the native Microlaena stipoides was less well defended under eCO2 in terms of both phenolics and silicon, and thus could suffer greater vulnerability to herbivores. To our knowledge, this is the first demonstration of the impacts of eCO2 and eT on silicon accumulation in grasses. We speculate that the greater plasticity in silicon uptake shown by Australian native grasses may be partly a consequence of evolving in a low nutrient and seasonally arid environment. © 2017 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110278
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Hawkesbury Institute for the Environment, Western Sydney University, Penrith, NSW, Australia; Department of Biology, York Environment and Sustainability Institute, University of York, York, United Kingdom
Recommended Citation:
Johnson S.N.,Hartley S.E.. Elevated carbon dioxide and warming impact silicon and phenolic-based defences differently in native and exotic grasses[J]. Global Change Biology,2018-01-01,24(9)