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Responses of the Lichen Cladonia convoluta to High CO2

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Responses of the Lichen Cladonia convoluta to High CO

2

Level and Heavy Metal Treatment

Zolta´n Taka´cs, Zsolt Csintalan and Zolta´n Tuba*

Agricultural University of Gödöllo˜, Department of Botany and Plant Physiology, Pa´ter K. u. 1., 2103 Gödöllo˜, Hungary. Fax: +36 28 410 804. E-mail: tuba@fau.gau.hu

* Author for correspondence and reprint requests

Z. Naturforsch.54c,797Ð801 (1999); received November 15, 1998/March 5, 1999 Cadmium, Lead, Fluorescence, Respiration, Photosystem II

Despite of the downward acclimation of photosynthesis in C. convoluta, increased net photosynthesis and carbon balance can be anticipated in response to elevated atmospheric CO2level. CO2exchange measurement seems to be more indicative when detecting heavy metal stress than fluorescence parameters. Among these, the relative fluorescence decrease ratio (RFd690) shows damage first, suggesting that the primary attack site for heavy metal ions is CO2fixation and reaction centres are harmed last. Long-term elevated CO2amelio- rates partly this damage by improving C-balance to a greater extent in the heavy-metal stressed lichens.

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