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 Accumulation of UV-Absorbing Compounds as a Strategy Against UVR

 Accumulation of UV-Absorbing Compounds as a Strategy Against UVR

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They increased in cellular content with increased UV exposure (Brenowitz and

Castenholz, 1997; Pavia et al., 1997; Han and Han, 2005; Zheng and Gao, 2009) to

reduce UV-related photoinhibition and damage, playing a protective role against

solar UVR (Oren and Gunde-Cimerman, 2007).

Seaweeds often exhibit high levels of UVAC, such as MAAs in the red alga

Porphyra columbina (Korbee-Peinado et al., 2004), an unknown UV-B absorbing

substance in the green alga Ulva pertusa (Han and Han, 2005), and phlorotannin

in the brown algae Ascophyllum nodosum and Fucus gardneri (Pavia et al., 1997;

Henry and Van Alstyne, 2004). Higher levels of UVAC have been found in the red

alga Gracilaria lemaneiformis under full spectrum of solar radiation than UVRfree treatments, reflecting a responsive induction (Gao and Xu, 2008). Synthesis

of UVAC has been found to be induced by UV-B in Chondrus crispus (Karsten

et al., 1998), Porphyra columbina (Korbee-Peinado et al., 2004), and Ulva pertusa

(Han and Han, 2005). Such stimulation is dependent on both dose and wavelength, with higher accumulation of UVAC under high daily doses (Karsten et al.,

1998; Franklin et al., 2001). UVR was suggested to trigger some photoreceptors

(active wavelengths between 280 and 320 nm) in the algae to sense the need for

UVAC synthesis (Han and Han, 2005; Oren and Gunde-Cimerman, 2007).

Accumulation of UVAC is often associated with decreased Chl a, resulting in an

increased ratio of UVAC to Chl a (Gao and Xu, 2008).

MAAs, the most common UV-screening compounds, are water-soluble

substances with absorption maxima ranging from 310 to 360 nm (Nakamura

et al., 1982). Although their UVR-protective function is not yet completely clear,

the most acceptable interpretation is that they play a role as a screen against UVR

(Conde et al., 2000; Karsten et al., 2005). Some of these compounds may also

function as antioxidants (Dunlap and yamamoto, 1995; Suh et al., 2003), osmosisregulating substances (Oren, 1997), antenna pigments channeling the energy to the

photosynthetic apparatus (Sivalingam et al., 1976; Gao et al., 2007), or an intracellular

nitrogen storage (Korbee-Peinado et al., 2004; Korbee et al., 2006). Accumulation

of MAAs could be induced by different radiation treatments (Karsten et al., 1999;

Korbee-Peinado et al., 2004; Karsten et al., 2005) or affected by osmotic stress

(Oren, 1997; Klisch et al., 2002) and nutrient availability (Korbee-Peinado et al.,

2004; Korbee et al., 2005; Zheng and Gao, 2009). The accumulation of MAAs was

found to be dependent on both dose and wavelength of incident solar radiation,

with higher accumulation of MAAs associated with high daily doses in Chondrus

crispus (Karsten et al., 1998; Franklin et al., 2001). Nutrient availability was also

found to affect the accumulation of MAAs (Karsten and Wiencke, 1999; KorbeePeinado et al., 2004); enrichment of nitrate enhanced the content of MAAs in

Gracilaria tenuistipitata (Zheng and Gao, 2009). Porphyra plants contain high

levels of MAAs (up to 1% of the dry weight), mainly porphyra-334, which accumulates to the highest concentrations among the species of red algae studied so

far (Gröniger et al., 1999; Hoyer et al., 2001). However, some studies showed that

contents of MAAs did not increase in response to UVR or PAR and could not



completely protect Porphyra umbilicalis and Gracilaria cornea against UVR

(Gröniger et al., 1999; Sinha et al., 2000).

Distribution of seaweed at different zonational depths affects the accumulation of MAAs. Intertidal species are usually more resistant to UV stress (i.e.,

inhibition of photosynthesis) than subtidal species that have less or no MAAs

(Maegawa et al., 1993). It was found that deep-water polar macroalgal species did

not have MAAs, whereas supra- and eulittoral species contained MAAs to high

concentrations (Hoyer et al., 2002). Total MAAs content in Mastocarpus stellatus

was sixfold higher than in Chondrus crispus that was generally found at a greater

depth; quantum yield and maximal electron transport rate were more reduced in

C. crispus than M. stellatus by UV-B radiation (Bischof et al., 2000). MAAs content in Devaleraea ramentacea increased with decreased depth, being correlated

with a higher photosynthetic capacity under UVR treatment (Karsten et al.,

1999). The macroalgal zonation patterns relate to their ability to resist high

radiation stress (Hanelt, 1998).

Macroalgal species distributed at the upper part of intertidal zone may be

exposed to much higher solar radiation during emersion if the low tide coincides

with local noon. Recently, it was shown that desiccation or dehydration of

Porphyra haitanensis thalli led to higher absorptivity of the UVAC (Jiang et al.,

2008). The ability for Porphyra haitanensis thalli to increase its cellular content of

UVAC during such emersion period allows them to cope with UVR stress. The

possible strategy for macroalgal species to survive at the upper levels of intertidal

zone is to increase its content of UVAC, which play roles in both sunscreening

and osmosis regulation.

6. summary

PAR drives photosynthesis, whereas UVR is usually known to harm physiological

processes in macroalgae as well as phytoplankton. UV-A, however, at reduced

levels, has been shown to enhance photosynthesis and repairing processes of photodamaged molecules, whereas UV-B mostly results in harmful effects. During their

long history of evolution, seaweeds have developed protective strategies against

harmful UV irradiances, such as synthesizing and accumulating UVAC and the

repair of DNA damage. Different life stages of seaweeds show different sensitivity

to solar UVR, with less-differentiated forms being more sensitive to UVR. Species

distributed at different depths in the intertidal zone also show different responses

to solar UVR; upper species, that are usually exposed to higher levels of solar

radiation and accumulate higher contents of UVAC (such as MAAs), are more

tolerant of UVR. On the other hand, diurnal photosynthesis can be underestimated during twilight period or cloudy days and overestimated during noontime

if the effects of UVR are ignored owing to positive and negative effects caused by

UV-A, respectively, at low and high irradiance levels.



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Biodata of E. Walter Helbling, Virginia E. Villafañe, and Donat-P. Häder,

authors of “Ultraviolet Radiation Effects on Macroalgae from Patagonia, Argentina”

Dr. E. Walter Helbling is currently the Director of Estación de Fotobiología

Playa Unión (EFPU, Argentina) and a researcher from Consejo Nacional de

Investigaciones Científicas y Técnicas (CONICET, Argentina). He obtained his

Ph.D. from Scripps Institution of Oceanography, University of California, San

Diego (USA). His scientific interests are in ecophysiology of plankton and photobiology of aquatic systems in relation to climate change.

E-mail: whelbling@efpu.org.ar

Dr. Virginia E. Villafe is currently a Researcher from Consejo Nacional de

Investigaciones Científicas y Técnicas (CONICET, Argentina). She obtained

her Ph.D. from University of Groningen (The Netherlands) and continued her

research in Patagonia at Estación de Fotobiología Playa Unión (EFPU, Argentina).

Dr. Villafe´s scientific interests are in the areas of ecophysiology of plankton and


E-mail: Virginia@efpu.org.ar

Virginia E. Villafañe

E. Walter Helbling


A. Israel et al. (eds.), Seaweeds and their Role in Globally Changing Environments,

Cellular Origin, Life in Extreme Habitats and Astrobiology 15, 199–214

DOI 10.1007/978-90-481-8569-6_12, © Springer Science+Business Media B.V. 2010



Professor Donat-P. Häder holds the Chair of Plant Ecophysiology at the Department

for Biology at the Friedrich-Alexander University in Erlangen-Nürnberg. He

obtained his Ph.D. from the University of Marburg in 1973. After a Postdoc year

in East Lansing Michigan state, he became Researcher in Marburg. Professor

Häder’s scientific interests are in the areas of the effects of stratospheric ozone

depletion and resulting increasing solar UV-B radiation at the Earth’s surface on

the biota. He concentrates on these effects in combination with global climate

change on aquatic ecosystems in many habitats over the globe.

E-mail: dphaeder@biologie.uni-erlangen.de

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