期刊
NEW PHYTOLOGIST
卷 188, 期 3, 页码 845-855出版社
WILEY
DOI: 10.1111/j.1469-8137.2010.03403.x
关键词
Agrostis canina; CO2; palaeo-[CO2]; stomatal index; sulphur dioxide (SO2)
资金
- UCD Seed Fund
- EU [MEXT-CT-2006-042531]
- SFI [08/RFP/EOB1131]
P>Stomatal index values of fossil plants are widely used in reconstructing palaeo-[CO2]. This depends upon the assumption that the stomatal index is determined by the atmospheric concentration of CO2 ([CO2]). This study investigates whether fumigation with, and resistance to, sulphur dioxide (SO2) induces a reduction in the stomatal index that may affect stomatal reconstructions of palaeo-[CO2] coinciding with episodes of global-scale volcanism. Agrostis canina from Mefite di Ansanto, Italy, grow in atmospheres of elevated-[CO2], SO2 and hydrogen sulphide (H2S). Mefite A. canina were compared with a control population in a 'common-garden' experiment and a controlled-environment study under elevated-[CO2] and SO2 fumigation. In A. canina, resistance to toxic volcanic gases is not associated with reduced stomatal index, and fumigation with SO2 does not cause a decrease in stomatal initiation. The two populations of A. canina analyzed in this study exhibit different stomatal index-[CO2] 'responses', with control plants showing a reduction in stomatal index and Mefite plants showing no response. Stomatal reconstructions of palaeo-[CO2] during past episodes of global-scale volcanism probably reflect atmospheric [CO2] and not [SO2]. The lack of a reduction in the stomatal index in response to elevated [CO2] in the Mefite plants, suggests that resistance to toxic gases and/or long-term growth at high [CO2] reduces, or negates, sensitivity of the stomatal index-[CO2] relationship, or that stomatal index-[CO2] in the Mefite plants is attuned to [CO2] fluctuations at much higher concentrations.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据