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AOBPreview originally published online on August 5, 2002
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Annals of Botany 90: 337-343, 2002
© 2002 Annals of Botany Company

Soil Cations Influence Bryophyte Susceptibility to Bisulfite

BHAGAWAN BHARALI{dagger},1 and JEFFREY W. BATES*,1

1 Department of Biological Sciences, Imperial College at Silwood Park, Ascot, Berkshire SL5 7PY, UK

* For correspondence. Fax +44 (0)207 584 2339, e-mail j.bates{at}ic.ac.uk
{dagger} Present address: Department of Crop Physiology, Assam Agricultural University, Jorhat-785013, Assam, India.

Received: 29 January 2002; Returned for revision: 25 March 2002; Accepted: 31 May 2002    Published electronically: 5 August 2002

The hypothesis that metal ions absorbed by bryophytes from the underlying soil may ameliorate adverse effects of SO2 was investigated in the terricolous moss species Pleurozium schreberi (Brid.) Mitt. and Rhytidiadelphus triquetrus (Hedw.) Warnst. Dilute sodium bisulfite solutions (equivalent to dissolved SO2) were applied to shoots isolated from soil or in contact with artificial substrata. Marked inhibition of net photosynthesis was observed within 2 h of treatment with 0·3 mM bisulfite in both mosses. Progressive recovery of net photosynthesis occurred 2–8 h after bisulfite treatment, although the extent of this depended on the concentration and pH of the solution. When R. triquetrus and P. schreberi were grown on artificial substrata (calcareous, acid-mineral or acid-organic) with weekly bisulfite applications, the only significant effect was poorer growth of P. schreberi receiving bisulfite on the calcareous and acid-organic substrata. In both species, growth on the calcareous substratum led to increased concentrations of exchangeable Ca2+, whereas exchangeable Fe3+ concentrations increased following growth on the acid-mineral soil. In another experiment the two mosses were pre-treated with either Ca2+ or Fe3+ before incubation with bisulfite. In P. schreberi, the depression of net photosynthetic rate caused by bisulfite was ameliorated from 33 to 64 % of the control by pre-treatment with Fe3+, but it was unaffected by Ca2+ pre-treatment. In R. triquetrus, the amelioration caused by Fe3+ pre-treatment was from 16 to 60 % of the control, but pre-treatment with Ca2+ gave a greater amelioration, to 75 % of the control value. The responses are discussed in terms of soil preferences of the mosses and possible underlying bisulfite amelioration mechanisms.

Key words: Bryophytes, SO2 pollution, bisulfite, amelioration, calcicoly, Ca2+, Fe3+, Pleurozium schreberi, Rhytidiadelphus triquetrus


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B. BHARALI and J. W. BATES
Detoxification of Dissolved SO2 (Bisulfite) by Terricolous Mosses
Ann. Bot., February 1, 2006; 97(2): 257 - 263.
[Abstract] [Full Text] [PDF]


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