Influence of UV radiation on growth of sporelings of three non-geniculate coralline red algae from Southern Iberian Peninsula

Bañares, Elena; Altamirano, Marı́a; Figueroa, Félix L.; Flores‐Moya, Antonio

doi:10.1046/j.1440-1835.2002.00256.x

Cited by 4 publications

(2 citation statements)

References 38 publications

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“…A clear dependence of the UV susceptibility of germination and growth of sporelings of coralline algae on the radiation conditions in the habitat of the various species has been demonstrated by Bañ ares et al (2002). Spores from species in sunexposed habitats in the eulittoral were more UV tolerant than spores from a species growing in shaded crevices.…”

Section: Rev Environ Sci Biotechnolmentioning

confidence: 98%

Ultraviolet radiation shapes seaweed communities

Bischof

Gómez

Molis

et al. 2006

Rev Environ Sci Biotechnol

203

109

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Stratospheric ozone depletion and the concomitant increase in irradiance of ultraviolet-B radiation (UVB) at the earth's surface represent major threats to terrestrial and aquatic ecosystems. In costal rocky shore environments, seaweeds constitute a group of organisms of particular significance to ecosystem function. Thus, impairment of seaweed performance by UVB-exposure may result in severe changes in the functioning of coastal ecosystems. Here we present our view on how UVB radiation affects seaweed physiology and ecology and, thus, shapes the coastal environment by affecting the spatial, species and functional structure of seaweed communities.

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Section: Rev Environ Sci Biotechnolmentioning

confidence: 98%

Ultraviolet radiation shapes seaweed communities

Bischof

Gómez

Molis

et al. 2006

Rev Environ Sci Biotechnol

203

109

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“…Effects of UVR on photosynthesis have been studied on gametophytes and zoospores of laminariales (Dring et al 1996b and unicells of ulvales (Cordi et al 2001). Other studies on the impact of UVR on the early life stages of green, red and brown macroalgae have focused either on (1) the sporulation of fertile thalli, (2) germination and photomovement of spores, (3) growth of germlings or (4) DNA synthesis in gametophytes (Huovinen et al 2000, Swanson & Druehl 2000, Cordi et al 2001, Makarov & Voskoboinikov 2001, Bañares et al 2002, Altamirano et al 2003a,b, Han et al 2003. All these studies indicated high sensitivity of the early life stages of macroalgae to UV-B.…”

Section: Introductionmentioning

confidence: 99%

PAR and UVBR effects on photosynthesis, viability, growth and DNA in different life stages of coexisting Gigartinales: implications for recruitment and zonation pattern

Roleda¹,

Poll²,

Hanelt³

et al. 2004

Mar. Ecol. Prog. Ser.

113

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The effects that ultraviolet radiation (UVR, 280 to 400 nm) and photosynthetically active radiation (PAR, 400 to 700 nm) had on early life stages of Mastocarpus stellatus and Chondrus crispus were studied to determine if differences in UVR tolerance could influence their recruitment success on the upper eulittoral shores of Helgoland (North Sea). Photosynthesis, germination capacity, DNA damage and carpospore repair were measured after exposures to different time lengths and intensities of PAR + UV-A + UV-B, PAR + UV-A or PAR alone, and also after recovery in low white light. Germination and photosynthesis of the low light adapted carpospores of both species were inhibited as PAR was increased. Supplemental UV-A and UV-B had a small additional effect on the F v /F m of M. stellatus but this effect was more pronounced in C. crispus. However, photosynthesis of both species significantly recovered after 48 h. Carpospore viability in C. crispus was more sensitive than in M. stellatus to UVR, while a higher dose was needed to achieve 50% germination inhibition in M. stellatus. Furthermore, UV-B-induced DNA damage, measured as cyclobutane-pyrimidine dimers (CPDs), was less in M. stellatus spores, which also exhibited an efficient DNA repair mechanism compared with C. crispus. In contrast, growth and chlorophyll a contents in young gametophytes of both species were not affected by repeated UV exposures. Higher total carotenoid was measured in plants exposed to UVR, indicating a photoprotection role, because photosynthesis completely acclimated to UVR after 3 d. Furthermore, DNA damage was not detected on mature fronds of both species when exposed to the full solar spectrum. Therefore, the susceptibility of carpospores to UVR could influence species recruitment to the upper eulittoral zone.

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UV‐A/BLUE LIGHT–INDUCED REACTIVATION OF SPORE GERMINATION IN UV‐B IRRADIATED ULVA PERTUSA (CHLOROPHYTA)¹

Han

Kong

Han

et al. 2004

Journal of Phycology

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Recent reduction in the ozone shield due to manufactured chlorofluorocarbons raised considerable interest in the ecological and physiological consequences of UV‐B radiation (λ=280–315 nm) in macroalgae. However, early life stages of macroalgae have received little attention in regard to their UV‐B sensitivity and UV‐B defensive mechanisms. Germination of UV‐B irradiated spores of the intertidal green alga Ulva pertusa Kjellman was significantly lower than in unexposed controls, and the degree of reduction correlated with the UV doses. After exposure to moderate levels of UV‐B irradiation, subsequent exposure to visible light caused differential germination in an irradiance‐ and wavelength‐dependent manner. Significantly higher germination was found at higher photon irradiances and in blue light compared with white and red light. The action spectrum for photoreactivation of germination in UV‐B irradiated U. pertusa spores shows a major peak at 435 nm with a smaller but significant peak at 385 nm. When exposed to December sunlight, the germination percentage of U. pertusa spores exposed to 1 h of solar radiation reached 100% regardless of the irradiation treatment conditions. After a 2‐h exposure to sunlight, however, there was complete inhibition of germination in PAR+UV‐A+UV‐B in contrast to 100% germination in PAR or PAR+UV‐A. In addition to mat‐forming characteristics that would act as a selective UV‐B filter for settled spores under the parental canopy, light‐driven repair of germination after UV‐B exposure could explain successful continuation of U. pertusa spore germination in intertidal settings possibly affected by intense solar UV‐B radiation.

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Influence of UV radiation on growth of sporelings of three non-geniculate coralline red algae from Southern Iberian Peninsula

Cited by 4 publications

References 38 publications

Ultraviolet radiation shapes seaweed communities

Ultraviolet radiation shapes seaweed communities

PAR and UVBR effects on photosynthesis, viability, growth and DNA in different life stages of coexisting Gigartinales: implications for recruitment and zonation pattern

UV‐A/BLUE LIGHT–INDUCED REACTIVATION OF SPORE GERMINATION IN UV‐B IRRADIATED ULVA PERTUSA (CHLOROPHYTA)¹

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Influence of UV radiation on growth of sporelings of three non-geniculate coralline red algae from Southern Iberian Peninsula

Cited by 4 publications

References 38 publications

Ultraviolet radiation shapes seaweed communities

Ultraviolet radiation shapes seaweed communities

PAR and UVBR effects on photosynthesis, viability, growth and DNA in different life stages of coexisting Gigartinales: implications for recruitment and zonation pattern

UV‐A/BLUE LIGHT–INDUCED REACTIVATION OF SPORE GERMINATION IN UV‐B IRRADIATED ULVA PERTUSA (CHLOROPHYTA)1

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UV‐A/BLUE LIGHT–INDUCED REACTIVATION OF SPORE GERMINATION IN UV‐B IRRADIATED ULVA PERTUSA (CHLOROPHYTA)¹