Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1111/gcb.13971 |
Elevated carbon dioxide and warming impact silicon and phenolic-based defences differently in native and exotic grasses | |
Johnson, Scott N.1; Hartley, Susan E.2 | |
2018-09-01 | |
发表期刊 | GLOBAL CHANGE BIOLOGY |
ISSN | 1354-1013 |
EISSN | 1365-2486 |
出版年 | 2018 |
卷号 | 24期号:9页码:3886-3896 |
文章类型 | Article |
语种 | 英语 |
国家 | Australia; England |
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 (eCO(2)) (+240ppm) and temperature (eT) (+4 degrees C) affected chemical composition (silicon, phenolics, carbon and nitrogen) and plant growth in eight grass species, either native or exotic to Australia. eCO(2) 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 eCO(2) 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 eCO(2) 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. |
英文关键词 | defences grasses herbivores phenolic acids silica silicon stress trade-offs |
领域 | 气候变化 ; 资源环境 |
收录类别 | SCI-E |
WOS记录号 | WOS:000441746900003 |
WOS关键词 | PLANT-HERBIVORE INTERACTIONS ; ATMOSPHERIC CO2 ; INVASIVE PLANTS ; TEMPERATURE ; RESISTANCE ; CHEMISTRY ; RESPONSES ; MECHANISMS ; NITROGEN ; ECOLOGY |
WOS类目 | Biodiversity Conservation ; Ecology ; Environmental Sciences |
WOS研究方向 | Biodiversity & Conservation ; Environmental Sciences & Ecology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/17040 |
专题 | 气候变化 资源环境科学 |
作者单位 | 1.Western Sydney Univ, Hawkesbury Inst Environm, Penrith, NSW, Australia; 2.Univ York, York Environm & Sustainabil Inst, Dept Biol, York, N Yorkshire, England |
推荐引用方式 GB/T 7714 | Johnson, Scott N.,Hartley, Susan E.. Elevated carbon dioxide and warming impact silicon and phenolic-based defences differently in native and exotic grasses[J]. GLOBAL CHANGE BIOLOGY,2018,24(9):3886-3896. |
APA | Johnson, Scott N.,&Hartley, Susan E..(2018).Elevated carbon dioxide and warming impact silicon and phenolic-based defences differently in native and exotic grasses.GLOBAL CHANGE BIOLOGY,24(9),3886-3896. |
MLA | Johnson, Scott N.,et al."Elevated carbon dioxide and warming impact silicon and phenolic-based defences differently in native and exotic grasses".GLOBAL CHANGE BIOLOGY 24.9(2018):3886-3896. |
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