Chlorophyll fluorescence and CO2 exchange of the heavy metal-treated moss, Tortula ruralis under elevated CO2 concentration

Z. Takács, E. Ötvös, H. K. Lichtenthaler, Z. Tuba

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Chlorophyll fluorescence ratios of fluorescence (blue/green F450/F530; blue/red F450/F690; blue/far-red F450/F735; red/far-red F690/F735, "Yield", Rfd, Fv/Fm), CO2 assimilation and dark respiration were studied in heavy metal-treated (Cd, Pb) Tortula ruralis growing at elevated-CO2 (700 ppm) and present-day CO2 (350 ppm) concentration for one month. Moss samples were measured at elevated-CO2 (700 ppm) and present-day CO2 (350 ppm) concentrations in special Open Top Chambers (OTC) developed for exposure of small poikilohydric plants. Photosynthetic quantum yield of PSII (F v/Fm) decreased in reponse to both heavy metals. Chlorophyll "Yield" values decreased in reponse to Pb and mixed (Cd, Pb) treatment, reached zero at Cd-treatment. There were no significant differences between CO2 treatments in any of the fluorescence parameters. Fluorescence ratios (F450/F530, F450/F690, F450/F735, F690/ F735) increased only in reponse to Cd treatment, indicating the decrease of the chlorophyll content and of photosynthetic activity of the light reaction. CO2 gas exchange measurements revealed the decrease (Pb) or the elimination (Cd) of photosynthetic activity due to heavy metal treatment independent of the CO2 level. According to the obtained results, future high CO2 level might be beneficial for the CO2 assimilation of the desiccation tolerant mosses with physiological level of heavy metals by improving their carbon balance. Elevated CO2 concentration can ameliorate partly the deleterious effects of heavy metal stress as well, but the response of the high CO2 treated mosses to the heavy metals are very diverse. Our data also confirm, that the fluorescence emission spectra ratios can be useful tool to follow the responses of mosses to the environmental factors.

Original languageEnglish
Pages (from-to)291-296
Number of pages6
JournalPhysiology and Molecular Biology of Plants
Volume10
Issue number2
Publication statusPublished - Jul 2004

Fingerprint

Bryophyta
Chlorophyll
Heavy Metals
mosses and liverworts
heavy metals
Fluorescence
fluorescence
chlorophyll
Desiccation
desiccation (plant physiology)
gas exchange
Tortula ruralis
Respiration
Carbon
Gases
Light
environmental factors
carbon

ASJC Scopus subject areas

  • Plant Science
  • Agronomy and Crop Science

Cite this

Chlorophyll fluorescence and CO2 exchange of the heavy metal-treated moss, Tortula ruralis under elevated CO2 concentration. / Takács, Z.; Ötvös, E.; Lichtenthaler, H. K.; Tuba, Z.

In: Physiology and Molecular Biology of Plants, Vol. 10, No. 2, 07.2004, p. 291-296.

Research output: Contribution to journalArticle

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abstract = "Chlorophyll fluorescence ratios of fluorescence (blue/green F450/F530; blue/red F450/F690; blue/far-red F450/F735; red/far-red F690/F735, {"}Yield{"}, Rfd, Fv/Fm), CO2 assimilation and dark respiration were studied in heavy metal-treated (Cd, Pb) Tortula ruralis growing at elevated-CO2 (700 ppm) and present-day CO2 (350 ppm) concentration for one month. Moss samples were measured at elevated-CO2 (700 ppm) and present-day CO2 (350 ppm) concentrations in special Open Top Chambers (OTC) developed for exposure of small poikilohydric plants. Photosynthetic quantum yield of PSII (F v/Fm) decreased in reponse to both heavy metals. Chlorophyll {"}Yield{"} values decreased in reponse to Pb and mixed (Cd, Pb) treatment, reached zero at Cd-treatment. There were no significant differences between CO2 treatments in any of the fluorescence parameters. Fluorescence ratios (F450/F530, F450/F690, F450/F735, F690/ F735) increased only in reponse to Cd treatment, indicating the decrease of the chlorophyll content and of photosynthetic activity of the light reaction. CO2 gas exchange measurements revealed the decrease (Pb) or the elimination (Cd) of photosynthetic activity due to heavy metal treatment independent of the CO2 level. According to the obtained results, future high CO2 level might be beneficial for the CO2 assimilation of the desiccation tolerant mosses with physiological level of heavy metals by improving their carbon balance. Elevated CO2 concentration can ameliorate partly the deleterious effects of heavy metal stress as well, but the response of the high CO2 treated mosses to the heavy metals are very diverse. Our data also confirm, that the fluorescence emission spectra ratios can be useful tool to follow the responses of mosses to the environmental factors.",
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