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Effects of Atmospheric O3 on Azolla-Anabaena Symbiosis.

Hur, Jae-Seoun and Wellburn, Alan R. (1994) Effects of Atmospheric O3 on Azolla-Anabaena Symbiosis. Annals of Botany, 73 (2). pp. 205-209. ISSN 1095-8290

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    Cultures of water fern Azolla pinnata R. Br. exposed for 1 week to either 30, 50 or 80 nl l-1 O3 showed significant reductions in rates of growth and N2 fixation, and had fewer heterocysts. Although the levels of glutamine synthetase (GS) and glutamate dehydrogenase (GDH) activity were decreased by low concentrations of O3 exposures (30 or 50 nl l-1), significant increases in levels of the same enzymes were caused by higher concentrations of O3 (80 nl l-1). Increased levels of total protein, polyamines (putrescine and spermidine), and the xanthophyll-cycle precursor of abscisic acid (ABA), violaxanthin, were also found with higher levels of O3 (80 nl l-1). Levels of ABA itself were significantly increased by low level O3 fumigation (30 nl l-1) but significantly decreased by exposure to 80 nl l-1 O3. This may indicate that higher levels of atmospheric O3 inhibit the final stages of ABA biosynthesis from violaxanthin.

    Item Type: Journal Article
    Journal or Publication Title: Annals of Botany
    Additional Information: The definitive publisher-authenticated version Cooper, Rachel Why Hacking is Wrong about Human Kinds British Journal for the Philosophy of Science 2004 55: 73-85 is available online at:
    Uncontrolled Keywords: Abscisic acid ; nitrogen assimilation ; nitrogen fixation ; ozone pollution ; polyamines ; violaxanthin
    Subjects: ?? ge ??
    Departments: Faculty of Science and Technology > Lancaster Environment Centre
    ID Code: 22459
    Deposited By: ep_ss_importer
    Deposited On: 29 Jan 2009 12:00
    Refereed?: Yes
    Published?: Published
    Last Modified: 25 Jun 2018 00:04
    Identification Number:

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