Effect of UV-B radiation on the content of UV-B absorbing compounds and photosynthetic parameters in Parmotrema austrosinense from two contrasting habitats. 2018

M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
Department of Experimental Biology, Laboratory of Photosynthetic Processes, Faculty of Science, Masaryk University, University Campus - Bohunice, Brno, Czech Republic.

We studied the resistance of Parmotrema austrosinense to UV-B stress. We focused on the effects of a high dose UV-B radiation on the content of chlorophylls, carotenoids and UV-B screening compounds. Photosynthetic parameters were measured by chlorophyll fluorescence (potential and effective quantum yields, photochemical and non-photochemical quenching) and evaluated in control and UV-B-treated lichens. Lichens from two different locations in Cordoba, Argentina, were selected: (i) high altitude and dry plots at (Los Gigantes) and (ii) lowland high salinity plots (Salinas Grandes). UV-B treatment led to a decrease in the content of photosynthetic pigments and UV-B screens (absorbance decrease in 220-350 nm) in the samples from Salinas Grandes, while in Los Gigantes samples, an increase in UV-B screen content was observed. Chlorophyll fluorescence parameters showed a UV-B-induced decline in FV /FM , ΦPSII and qP indicating limitation of primary photosynthetic processes in photosystem II (PSII) of symbiotic alga, more pronounced in Salinas Grandes samples. Protective mechanism of PSII were activated by the UV-B treatment to a higher extent in samples from Salinas Grandes (NPQ 0.48) than in Los Gigantes samples (NPQ 0.26). We concluded that site-related characteristics, and in particular different UV-B radiation regimen, had a strong effect on resistance of the photosynthetic apparatus of P. austrosinense to UV-B radiation.

UI MeSH Term Description Entries
D008011 Lichens Any of a group of plants formed by a symbiotic combination of a fungus with an algae or CYANOBACTERIA, and sometimes both. The fungal component makes up the bulk of the lichen and forms the basis for its name. Lichen
D010788 Photosynthesis The synthesis by organisms of organic chemical compounds, especially carbohydrates, from carbon dioxide using energy obtained from light rather than from the oxidation of chemical compounds. Photosynthesis comprises two separate processes: the light reactions and the dark reactions. In higher plants; GREEN ALGAE; and CYANOBACTERIA; NADPH and ATP formed by the light reactions drive the dark reactions which result in the fixation of carbon dioxide. (from Oxford Dictionary of Biochemistry and Molecular Biology, 2001) Calvin Cycle,Calvin-Benson Cycle,Calvin-Benson-Bassham Cycle,Carbon Fixation, Photosynthetic,Reductive Pentose Phosphate Cycle,Dark Reactions of Photosynthesis,Calvin Benson Bassham Cycle,Calvin Benson Cycle,Cycle, Calvin,Cycle, Calvin-Benson,Cycle, Calvin-Benson-Bassham,Photosynthesis Dark Reaction,Photosynthesis Dark Reactions,Photosynthetic Carbon Fixation
D002338 Carotenoids The general name for a group of fat-soluble pigments found in green, yellow, and leafy vegetables, and yellow fruits. They are aliphatic hydrocarbons containing 4 terpene subunits. Carotenes,Carotenoid,Tetraterpene Derivatives,Tetraterpenes,Carotene,Derivatives, Tetraterpene
D002734 Chlorophyll Porphyrin derivatives containing magnesium that act to convert light energy in photosynthetic organisms. Phyllobilins,Chlorophyll 740
D005453 Fluorescence The property of emitting radiation while being irradiated. The radiation emitted is usually of longer wavelength than that incident or absorbed, e.g., a substance can be irradiated with invisible radiation and emit visible light. X-ray fluorescence is used in diagnosis.
D000531 Altitude A vertical distance measured from a known level on the surface of a planet or other celestial body. Altitudes
D014466 Ultraviolet Rays That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants. Actinic Rays,Black Light, Ultraviolet,UV Light,UV Radiation,Ultra-Violet Rays,Ultraviolet Light,Ultraviolet Radiation,Actinic Ray,Light, UV,Light, Ultraviolet,Radiation, UV,Radiation, Ultraviolet,Ray, Actinic,Ray, Ultra-Violet,Ray, Ultraviolet,Ultra Violet Rays,Ultra-Violet Ray,Ultraviolet Black Light,Ultraviolet Black Lights,Ultraviolet Radiations,Ultraviolet Ray
D017753 Ecosystem A functional system which includes the organisms of a natural community together with their environment. (McGraw Hill Dictionary of Scientific and Technical Terms, 4th ed) Ecosystems,Biome,Ecologic System,Ecologic Systems,Ecological System,Habitat,Niche, Ecological,System, Ecological,Systems, Ecological,Biomes,Ecological Niche,Ecological Systems,Habitats,System, Ecologic,Systems, Ecologic
D055049 Salt Tolerance The ability of organisms to sense and adapt to high concentrations of salt in their growth environment. Salt-Tolerance,Saline-Tolerance,Salinity Tolerance,Salt Adaptation,Salt Adaption,Salt-Adaption,Adaptation, Salt,Adaption, Salt,Saline Tolerance,Salinity Tolerances,Salt Adaptations,Salt Adaptions,Salt Tolerances,Tolerance, Salinity,Tolerance, Salt

Related Publications

M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
January 2014, Journal of analytical methods in chemistry,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
January 2016, Frontiers in microbiology,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
January 2008, Photochemistry and photobiology,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
December 2012, Cellular and molecular biology (Noisy-le-Grand, France),
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
December 2009, Zhongguo Zhong yao za zhi = Zhongguo zhongyao zazhi = China journal of Chinese materia medica,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
March 2008, Journal of photochemistry and photobiology. B, Biology,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
December 2016, Molecules (Basel, Switzerland),
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
January 1991, Radiobiologiia,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
February 2013, Journal of plant physiology,
M Barták, and E Pláteníková, and H Carreras, and J Hájek, and J Morkusová, and A C Mateos, and M Marečková
August 2014, Journal of photochemistry and photobiology. B, Biology,
Copied contents to your clipboard!