![Seasonal patterns of ascorbate in the needles of Scots Pine (Pinus sylvestris L.) trees: Correlation analyses with atmospheric O"3 and NO"2 gas mixing ... [An article from: Environmental Pollution]](http://ecx.images-amazon.com/images/I/51FYG4STACL._SL500_AA240_.jpg)
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This digital document is a journal article from Environmental Pollution, published by Elsevier in . The article is delivered in HTML format and is available in your Amazon.com Media Library immediately after purchase. You can view it with any web browser.
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In the present field study the role of ascorbate in scavenging the harmful atmospheric trace gases O"3 and NO"2 was examined. For this purpose ascorbate contents were determined in needles of adult Scots pine trees (Pinus sylvestris L.) during three consecutive years. Ascorbate contents were correlated with ambient tropospheric O"3 and NO"2 concentrations and with meteorological parameters. The results showed a strong correlation of atmospheric O"3 but not of atmospheric NO"2 concentrations with the apoplastic content of ascorbate during the seasonal course. Ascorbate contents in needle extracts did not correlate with ambient trace gas concentrations. In the apoplastic space, but not in needle extracts ascorbate contents correlate highly significantly with global radiation. From these results it is assumed that apoplastic ascorbate in Scots pine needles is adapted to the actual atmospheric O"3 concentration to mediate immediate detoxification of O"3, while the atmospheric O"3 concentration itself is largely dependent on light intensity.
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