Responses of Nine Bryophyte and One Lichen Species from Different Microhabitats to Elevated UV-B Radiation

Csintalan, Zsolt; Tuba, Zoltán; Takács, Zoltan; Laitat, Eric

doi:10.1023/a:1013717628481

Cited by 31 publications

(16 citation statements)

References 19 publications

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“…-Compared with high plants, bryophytes frequently possess less-protective structural features against UV irradiation, such as thin lipid layer or no waxes on the surfaces [49]. However, they indeed exhibit good tolerance to enhanced UV irradiation [50]. This phenomenon means that bryophytes are able to biosynthesize UV-filtering compounds as their own protective strategy.…”

Section: Functions Against Bioticmentioning

confidence: 99%

Secondary Metabolites in Bryophytes: An Ecological Aspect

Xie

Lou

2009

Chemistry & Biodiversity

121

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Bryophytes frequently grow in an unfavorable environment as the earliest land plants, and inevitably biosynthesize secondary metabolites against biotic or abiotic stress. They not only defend against the plant competition, microbial attack, and insect or animal predation, but also function in UV protection, drought tolerance, and freezing survival. This review covers the ecological aspect of secondary metabolites in bryophytes and is taxonomically presented according to the ecological significances.

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Section: Functions Against Bioticmentioning

confidence: 99%

Secondary Metabolites in Bryophytes: An Ecological Aspect

Xie

Lou

2009

Chemistry & Biodiversity

121

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“…mitis (Sandst.) Ruoss, with more DNA damage accumulating in desiccated samples, presumably due to decreased photoreactivation (Buffoni-Hall et al 2003).Whilst desiccation tolerant bryophytes often show a higher tolerance of both photosynthetically active radiation (PAR) and UV-BR, than desiccation sensitive species (Seel et al 1992a;Tákacs et al 1999;Csintalan et al 2001) we do not know if the desiccated state confers protection from UV-BR induced DNA damage in these plants. Since the accumulation of DNA photoproducts represents the balance of damage and repair, and desiccation is likely to reduce the capacity for enzymatic repair, mosses could be particularly vulnerable to UV-BR in the desiccated state.…”

Section: Studies Of Several Plant Species Have Demonstrated Links Betmentioning

confidence: 99%

Desiccation protects two Antarctic mosses from ultraviolet-B induced DNA damage

Turnbull

Leslie

Robinson

2009

Functional Plant Biol.

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Antarctic mosses live in a frozen desert, and are characterised by the ability to survive desiccation. They can tolerate multiple desiccation-rehydration events over the summer growing season. As a result of recent ozone depletion, such mosses may also be exposed to ultraviolet-B radiation while desiccated. The ultraviolet-B susceptibility of Antarctic moss species was examined in a laboratory experiment that tested whether desiccated or hydrated mosses accumulated more DNA damage under enhanced ultraviolet-B radiation. Accumulation of cyclobutane pyrimidine dimers and pyrimidine (6–4) pyrimidone dimers was measured in moss samples collected from the field and then exposed to ultraviolet-B radiation in either a desiccated or hydrated state. Two cosmopolitan species, Ceratodon purpureus (Hedw.) Brid. and Bryum pseudotriquetrum (Hedw.) Gaertn., B.Mey. & Scherb, were protected from DNA damage when desiccated, with accumulation of cyclobutane pyrimidine dimers reduced by at least 60% relative to hydrated moss. The endemic Schistidium antarctici (Cardot) L.I. Savicz & Smirnova accumulated more DNA damage than the other species and desiccation was not protective in this species. The cosmopolitan species remarkable ability to tolerate high ultraviolet-B exposure, especially in the desiccated state, suggests they may be better able to tolerate continued elevated ultraviolet-B radiation than the endemic species.

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“…Our knowledge of the effects of enhanced UV‐B radiation on bryophytes is limited to cases in which these effects are considered to be species‐specific (Gehrke, 1999; Csintalan et al , 2001; Boelen et al , 2006), and common trends are still unknown (Martínez‐Abaigar et al , 2003). P. shreberi (Britt.)…”

Section: Introductionmentioning

confidence: 99%

Acclimation of a pleurocarpous moss Pleurozium schreberi (Britt.) Mitt. to enhanced ultraviolet radiation in situ

Lappalainen

Huttunen

Suokanerva

2007

Global Change Biology

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We investigated the responses of ultraviolet (UV)-absorbing compounds, chlorophylls a and b, carotenoids and the growth responses of the pleurocarpous moss Pleurozium schreberi (Britt.) Mitt. to enhanced UV radiation in situ. The moss was exposed to a 52% elevation above the ambient level of erythemally weighted UV-B radiation, simulating an approximate 20% reduction in the ozone column, in a dry pine forest in Sodankylä, Finland (67122 0 N, 26138 0 E), under arrays of lamps filtered with cellulose diacetate, which transmitted both UV-B and UV-A radiation. The moss was also exposed to elevated UV-A radiation under control arrays of lamps filtered with Melinex polyester and to ambient radiation under arrays with no lamps in them. Effects of enhanced UV radiation on P. schreberi were recorded during the first 3 years of exposure. Enhanced UV-B radiation did not affect the segment height growth of the moss. The annual dry mass after the second growing season was higher in the UV-A control than in the other treatments, and dry mass decreased significantly during the third treatment year in both UV treatments compared with the ambient. The specific leaf area of the UV-B-treated mosses was significantly higher than the ambient control mosses during the first 2 years. An increase of UV-absorbing compounds was found in the mosses under enhanced UV-B radiation compared with the UV-A control mosses during the first year. Even though the treatment effect on UV-absorbing compounds was transient, the concentrations of these compounds correlated with the amount of UV-A and UV-B radiation received under the elevated UV-B treatment. A correlation with the irradiation of previous days and preceding month of the sampling day was found. A seasonal reduction occurred in the amount of UV-absorbing compounds from the beginning of the summer to late summer. The amount of photosynthetic pigments correlated with the amount of photosynthetically active radiation. The moss P. schreberi was thus found to tolerate increasing UV-B radiation. Our data indicate that P. schreberi tolerates a 52% increase in erythemally weighted UV-B radiation above ambient, responding during the first few years of exposure by increasing UV-absorbing compounds and specific leaf area, and decreasing annual dry mass, and then acclimating to its altered radiation environment.

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Responses of Nine Bryophyte and One Lichen Species from Different Microhabitats to Elevated UV-B Radiation

Cited by 31 publications

References 19 publications

Secondary Metabolites in Bryophytes: An Ecological Aspect

Secondary Metabolites in Bryophytes: An Ecological Aspect

Desiccation protects two Antarctic mosses from ultraviolet-B induced DNA damage

Acclimation of a pleurocarpous moss Pleurozium schreberi (Britt.) Mitt. to enhanced ultraviolet radiation in situ

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