NDLI: Photochemical Performance of the Acidophilic Red Alga Cyanidium sp. in a pH Gradient

Content Provider	Springer Nature Link
Author	Kvíderová, Jana
Copyright Year	2012
Abstract	The acidophilic red alga Cyanidium sp. is one of the dominant mat-forming species in the highly acidic waters of Río Tinto, Spain. The culture of Cyanidium sp., isolated from a microbial mat sample collected at Río Tinto, was exposed to 9 different pH conditions in a gradient from 0.5 to 5 for 24 h and its physiological status evaluated by variable chlorophyll a fluorescence kinetics measurements. Maximum quantum yield was determined after 30 min, 1 h, 2 h, 4 h, 6 h and 24 h of exposure after 15 min dark adaptation. The effect of pH on photochemical activity of Cyanidium sp. was observable as early as 30 min after exposure and the pattern remained stable or with only minor modifications for 24 h. The optimum pH ranged from 1.5 to 2.5. A steep decrease of the photochemical activity was observed at pH below 1 even after 30 min of exposure. Although the alga had tolerated the exposure to pH = 1 for at least 6 h, longer (24 h) exposure resulted in reduction of the photochemical activity. At pH above 2.5, the decline was more moderate and its negative effect on photochemistry was less severe. According to the fluorescence measurements, the red alga Cyanidium sp. is well-adapted to prevailing pH at its original locality at Río Tinto, i.e. pH of 1 to 3. The short-term survival in pH < 1.5 may be adaptation to rare exposures to such low pH in the field. The tolerance of pH above 3 could be caused by adaptation to the microenvironment of the inner parts of microbial mats in which Cyanidium sp. usually dominates and where higher pH could occur due to photosynthetic oxygen production.
Starting Page	223
Ending Page	234
Page Count	12
File Format	PDF
ISSN	01696149
Journal	Origins of Life and Evolution of Biospheres
Volume Number	42
Issue Number	2-3
e-ISSN	15730875
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-06-02
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	Acidic environment Algae Chlorophyll fluorescence Cyanidium pH gradient Earth Sciences Life Sciences Biochemistry Astronomy, Observations and Techniques Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Medicine Ecology, Evolution, Behavior and Systematics Space and Planetary Science

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Photochemical performance of the acidophilic red alga Cyanidium sp. in a pH gradient.

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Photochemical Performance of the Acidophilic Red Alga Cyanidium sp. in a pH Gradient

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Photochemical performance of the acidophilic red alga Cyanidium sp. in a pH gradient.

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