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Effects of atmospheric SO2 on Azolla and Anabaena symbiosis.

Hur, Jae-Seoun and Wellburn, Alan R. (1993) Effects of atmospheric SO2 on Azolla and Anabaena symbiosis. Physiologia Plantarum, 88 (1). pp. 65-72.

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Abstract

The water fern Azolla pinnata R. Br. was fumigated for 1 week with either 25, 50 or 100 nl 1−1 SO2. The symbiosis of Azolla with Anabaena azollae (spp.) was severely damaged by atmospheric SO2 even at concentrations as low as 25 nl 1−1, with significant reductions in growth, reduction of C2H2, NH3 assimilation, protein synthesis, and heterocyst development. These disturbances appear to be mainly responsible for the extreme sensitivity of this fern to atmospheric SO2. Changes in violaxanthin/antheraxanthin and epoxy-lutein/lutein ratios also indicate that free radical products are induced by atmospheric SO2. These results suggest that the Azolla-Anabaena symbiotic system is a very responsive and reliable lower plant model to study the detailed effects of total sulphur deposition upon the balances between various important plant metabolic processes.

Item Type: Article
Journal or Publication Title: Physiologia Plantarum
Uncontrolled Keywords: Anabaena • Azolla • heterocyst • N2 fixation • oxidative stress • pigments • symbiosis • sulphur dioxide
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 22635
Deposited By: ep_ss_importer
Deposited On: 22 Jan 2009 09:40
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 16:03
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/22635

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