UV-B tolerance of bryophyte species with different degrees of desiccation tolerance

Takács, Zoltan; Csintalan, Zsolt; Sass, László; Laitat, Eric; Vass, I.; Tuba, Zoltán

doi:10.1016/s1011-1344(99)00029-9

Cited by 44 publications

(22 citation statements)

References 26 publications

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“…Bryophytes have ectohydric nature (Tyler, 1990), thus their water relations and metabolic activity depend on the availability of water in their surroundings at any time. Field studies suggest that desiccation may often impair the capacities of bryophytes to benefit from favorable nutrient regimes (Bates, 2000) and the bryophytes belonging to wet and cool habitats suffer irreversible damage by desiccation (Takacs et al, 1999).…”

Section: Resultsmentioning

confidence: 99%

Active Moss Biomonitoring Applied to an Industrial Site in Romania: Relative Accumulation of 36 Elements in Moss-Bags

Culicov

Mocanu

Frontasyeva

et al. 2005

Environ Monit Assess

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Active moss biomonitoring using the species Sphagnum girgensohnii was tested at a strongly polluted site in Romania (Baia Mare) according to a novel sampling design. Nine moss transplants from each of the two background areas (Dubna, Russia and Vitosha Mountain, Bulgaria) were deployed in parallel on balconies about 24 m above street level for 4 months. The samples were analyzed for 36 elements using instrumental neutron activation analysis (INAA). Based on the results obtained the sampling variability is discussed in relation to the analytical variability, and the relative uptake of the different elements is assessed. The moss-bags using Sphagnum girgensohnii demonstrate a high or a very high relative uptake for a majority of the 36 investigated elements, but the values depend on the initial element concentration in the moss. Moss leaves analyzed separately showed somewhat higher levels than stems for many elements. Practical considerations however still speak in favor of using the whole moss for transplants.

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Section: Resultsmentioning

confidence: 99%

Active Moss Biomonitoring Applied to an Industrial Site in Romania: Relative Accumulation of 36 Elements in Moss-Bags

Culicov

Mocanu

Frontasyeva

et al. 2005

Environ Monit Assess

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“…The sensitivity of mosses to UV‐BR might be modified by other factors such as the ability to adapt to drought stress. Similar to UV‐BR, desiccation can cause oxidative stress (Takacs et al . 1999).…”

Section: Discussionmentioning

confidence: 99%

DNA damage and photosynthesis in Antarctic and Arctic Sanionia uncinata (Hedw.) Loeske under ambient and enhanced levels of UV‐B radiation

Lud

Moerdijk

Poll

et al. 2002

Plant Cell & Environment

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The response of the bipolar moss Sanionia uncinata (Hedw.) Loeske to ambient and enhanced UV-B radiation was investigated at an Antarctic (Léonie Island, 67 °°°° 35 ′ ′ ′ ′ S, 68 °°°° 20 ′ ′ ′ ′ W) and an Arctic (Ny-Alesund, 78 °°°° 55 ′ ′ ′ ′ N, 11 °°°° 56 ′ ′ ′ ′ E) site, which differed in ambient UV-B radiation (UV-BR: 280-320 nm) levels. The UV-BR effects on DNA damage and photosynthesis were investigated in two types of outdoor experiments. First of all, sections of turf of S. uncinata were collected in an Arctic and Antarctic field site and exposed outdoors to ambient and enhanced UV-BR for 2 d using UV-B Mini-lamps. During these experiments, chlorophyll a fluorescence, chlorophyll concentration and cyclobutyl pyrimidine dimer (CPD) formation were measured. Secondly, at the Antarctic site, a long-term filter experiment was conducted to study the effect of ambient UV-BR on growth and biomass production. Additionally, sections of moss turf collected at both the Antarctic and the Arctic site were exposed to UV-BR in a growth chamber to study induction and repair of CPDs under controlled conditions. At the Antarctic site, a summer midday maximum of 2·1 W m − − − − 2 of UV-BR did not significantly affect effective quantum yield ( ∆ ∆ ∆ ∆ F / F m ′ ′ ′ ′ ) and the ratio of variable to maximal fluorescence ( F v / F m ). The same was found for samples of S. uncinata exposed at the Arctic site, where summer midday maxima of UV-BR were about 50% lower than at the Antarctic site. Exposure to natural UV-BR in summer did not increase CPD values significantly at both sites. Although the photosynthetic activity remained largely unaffected by UV-B enhancement, DNA damage clearly increased as a result of UV-B enhancement at both sites. However, DNA damage induced during the day by UV-B enhancement was repaired overnight at both sites. Results from the long-term filter experiment at the Antarctic site indicated that branching of S. uncinata was reduced by reduction of ambient summer levels of UV-BR, whereas biomass production was not affected. Exposure of specimens collected from both sites to UV-BR in a growth chamber indicated that Antarctic and Arctic S. uncinata did not differ in UV-BR-induced DNA damage. It was concluded that S. uncinata from both the Antarctic and the Arctic site is well adapted to ambient levels of UV-BR.

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“…The few existing studies have linked desiccation to decreased encapsulation periods (Pechenik et al 2003) and increased mortality (Pechenik 1978, Creese 1980, Gosselin & Chia 1995, Yaroslavtseva et al 2001. UVR exposure and desiccation often occur concurrently during low tides, and research on bryophytes suggests that combined effects of UVR and desiccation exposure may be responsible for tolerance to these individual stressors (Takacs et al 1999). Nevertheless, the potential synergistic effects on invertebrate development have, surprisingly, not yet been examined.…”

Section: Introductionmentioning

confidence: 99%

Combined effects of solar radiation and desiccation on the mortality and development of encapsulated embryos of rocky shore gastropods

Przeslawski¹

2005

Mar. Ecol. Prog. Ser.

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Intertidal encapsulated embryos may be synchronously exposed to many environmental stressors, but interactions between some of these factors remain poorly understood. Here, the effects of solar radiation and desiccation on embryonic mortality and developmental rates were assessed using laboratory and field experiments. Egg masses of 3 intertidal gastropod species were exposed for 72 h to combinations of spectral (full spectrum, UV-blocked, dark) and daily emersion treatments (control, 15, 30, 60 min). Siphonaria denticulata and Bembicium nanum embryos were expected to be tolerant to emersion and UVR as they are routinely deposited on exposed rock platforms. In contrast, Dolabrifera brazieri embryos were predicted to be vulnerable to these stressors, as they are deposited in shaded, submerged habitats. Laboratory experiments revealed that light treatments and desiccation negatively affected the mortality and developmental rate of D. brazieri. The mortality of B. nanum did not significantly increase after UVR exposure or emersion, and the developmental rate was significantly faster in light treatments than in the dark. Surprisingly, embryonic mortality of S. denticulata was significantly higher in UV-blocked treatments than in full-spectrum treatments after 60 min emersion periods, but neither spectral treatments nor desiccation periods affected developmental rates. Field observations were also conducted to investigate the natural effects of desiccation on the embryonic mortality of S. denticulata and B. nanum. Despite the apparent resistance of these embryos to UVR and desiccation in the laboratory, mortality was significantly higher in desiccated habitats than in submerged habitats in the field, thus suggesting that selection of these spawning sites may not be optimal for embryos, particularly in light of global change. KEY WORDS: Mollusc · Marine invertebrate · Spawning habitat · Intertidal · Larvae · EncapsulationResale or republication not permitted without written consent of the publisher

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UV-B tolerance of bryophyte species with different degrees of desiccation tolerance

Cited by 44 publications

References 26 publications

Active Moss Biomonitoring Applied to an Industrial Site in Romania: Relative Accumulation of 36 Elements in Moss-Bags

Active Moss Biomonitoring Applied to an Industrial Site in Romania: Relative Accumulation of 36 Elements in Moss-Bags

DNA damage and photosynthesis in Antarctic and Arctic Sanionia uncinata (Hedw.) Loeske under ambient and enhanced levels of UV‐B radiation

Combined effects of solar radiation and desiccation on the mortality and development of encapsulated embryos of rocky shore gastropods

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