Effects of UVB Radiation on the Initial Stages of Growth of Gigartina Skottsbergii, Sarcothalia Crispata and Mazzaella Laminarioides (Gigartinales, Rhodophyta)

Mansilla, Andrés; Werlinger, Camilo; Palacios, Mauricio; Navarro, Nelso P.; Cuadra, Pedro

doi:10.1007/s10811-006-9051-9

Cited by 20 publications

(14 citation statements)

References 42 publications

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“…Decreases in the GRs in the beginning of experiments, as verified in young tetrasporophyte of I. cordata, have been reported for other species (Grobe and Murphy 1998;Altamirano et al 2000;Cordi et al 2001;Mansilla et al 2006) and could be interpreted as a period of acclimatization to the new irradiance condition. During the following weeks of cultivation, the GRs of young tetrasporophytes under UVBR treatment were similar to those tetrasporophytes cultivated under control conditions, even though tip-curling was observed.…”

Section: Mortality Growth and Morphologysupporting

confidence: 64%

“…UV radiation effects on macroalgae have primarily been assessed by studying growth rates (GR; Wood 1989;Friedlander and Ben-Amotz 1991;Grobe and Murphy 1998;van de Poll et al 2001;Roleda et al 2004b;Mansilla et al 2006). In contrast to growth, morphology has not been frequently addressed as a parameter influenced by radiation effects (Franklin and Forster 1997), although it can integrate stress effects at several levels.…”

Section: Introductionmentioning

confidence: 99%

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Iridaea cordata (Gigartinales, Rhodophyta): responses to artificial UVB radiation

2009

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The effects of UVB radiation on the different developmental stages of the carrageenan-producing red alga Iridaea cordata were evaluated considering: (1) carpospore and discoid germling mortality; (2) growth rates and morphology of young tetrasporophytes; and (3) growth rates and pigment content of field-collected plant fragments. Unialgal cultures were submitted to 0.17, 0.5, or 0.83 Wm −2 of UVB radiation for 3 h per day. The general culture conditions were as follows: 12 h light/12 h dark cycles; irradiance of 55µmol photon . per square meter per second; temperature of 9±1°C; and seawater enriched with Provasoli solution. All UVB irradiation treatments were harmful to carpospores (0:17 W m À2 ¼ 40:9 AE 6:9%, 0:5 W m À2 ¼ 59:8 AE 13:4%, 0:83 W m À2 ¼ 49 AE 17:4% mortality in 3 days). Even though the mortality of all discoid germlings exposed to UVB radiation was unchanged when compared to the control, those germlings exposed to 0.5 and 0.83 Wm −2 treatments became paler and had smaller diameters than those cultivated under control treatment. Decreases in growth rates were observed in young tetrasporophytes, mainly in 0.5 and 0.83 Wm −2 treatments. Similar effects were only observed in fragments of adult plants cultivated at 0.83 Wm −2 . Additionally, UVB radiation caused morphological changes in fragments of adult plants in the first week, while the young individuals only displayed this pattern during the third week. The verified morphological alterations in I. cordata could be interpreted as a defense against UVB by reducing the area exposed to radiation. However, a high level of radiation appears to produce irreparable damage, especially under longterm exposure. Our results suggest that the sensitivity to ultraviolet radiation decreases with increased algal age and that the various developmental stages have different responses when exposed to the same doses of UVB radiation.

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Section: Mortality Growth and Morphologysupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Iridaea cordata (Gigartinales, Rhodophyta): responses to artificial UVB radiation

2009

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“…This characteristic has been reported for ecotypes of other species, such as Fucus spp., where photosynthetic tolerance decreased linearly as the tested individuals came from lower in the intertidal (Dring and Brown 1982), a pattern that persisted for Baltic and intertidal Fucus populations (North sea) (Pearson et al 2000). Growth of microscopic (Mansilla et al 2006). Wave exposure affects the proportion of gametophytes and tetrasporophytes of M. oregona; gametophytes are more abundant under low wave exposure (Mudge and Scrosati 2003).…”

Section: Discussionmentioning

confidence: 92%

Seaweeds early development: detrimental effects of desiccation and attenuation by algal extracts

Contreras–Porcia

Callejas

Thomas

et al. 2011

Planta

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The effects of desiccation on the early development stages of Mazzaella laminarioides, Scytosiphon lomentaria and Lessonia nigrescens, algal species with different patterns of distribution across the intertidal zone, were examined in the laboratory. In addition, the protective effect against desiccation was evaluated using algal extracts, including those from Porphyra columbina, a macroalga tolerant to desiccation that lives in the uppermost part of the intertidal zone. Our results showed that M. laminarioides displayed the highest resistance to daily desiccation, followed by S. lomentaria, whereas L. nigrescens was the most susceptible. Spores from L. nigrescens exposed to desiccation, although being able to germinate, ceased further post-germination development. In addition, our results showed that all species exposed to extracts from desiccated P. columbina successfully completed their development and strongly suggest the occurrence of compounds with protective properties that help in attenuating the stress caused by desiccation. Finally, our results indicate that the magnitude of the effects generated by desiccation on the early algal development is related to the position of the species in the intertidal zone, and that the protective effects of P. columbina extracts reveal an exceptional metabolism of this species under desiccation stress.

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“…Here, a rapid and transient down regulation of photosynthesis seems to be the main mechanism under suddenly increasing UV levels. However, other adverse effects of enhanced UV-radiation, e.g., on small developmental stages of macroalgal species like spores and gametophytes may not be ruled out (Mansilla et al 2006, Wiencke et al 2007) and, therefore, further studies are needed. …”

Section: Desmarestia Confervoides and D Ligulatamentioning

confidence: 99%

Photosynthetic responses to UV-radiation of intertidal macroalgae from the Strait of Magellan (Chile)

Rautenberger

Mansilla

Gómez

et al. 2009

Rev. chil. hist. nat.

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For the first time, the photosynthetic performance of field-grown macroalgae from the Magellan Strait was evaluated with respect to their photoadaptation in the field and acclimation potential to ultraviolet radiation. Five macroalgal species were collected in the eulittoral and the upper sublittoral: Ulva intestinalis, Porphyra columbina, Adenocystis utricularis, Desmarestia confervoides and D. ligulata. Photosynthesis vs. irradiance (P-I) curves of macroalgae cultivated in the laboratory under low white light intensities more than a week were used to assess the acclimation potential to irradiance conditions in the field. Both, photosynthetic parameters referred to as maximum electron transport rate (ETRmax) and light saturation points of photosynthesis (I k ) were species-specific and did not correlate with the position on the shore. I k ranging between 80 and 215 μmol photons m -2 s -1 was indicative of moderate sun-adaptation in all studied species. The acclimation potential to UV-radiation was determined as the extent and the rates (m inh ) of PSII inhibition (resulting from decreased maximum PSII-quantum yield (Fv/Fm)) after four hours of UV-exposure and as the subsequent rates of recovery (m rec ) in dim PAR. The results suggest that photosynthesis of each species during UV-exposure was transiently down regulated rather than damaged. Furthermore, no reductions in ETRmax were detected after 4 h exposure to UV-A and UV-B-radiation, and consequently the Calvin cycle could not be affected. Thus, Fv/Fm was a more sensitive parameter than ETRmax explaining the photosynthetic UV acclimation. Both, the rates of inhibition and the rates of recovery were not correlated with the morpho-functional groups of macroalgae nor to their vertical distribution. Thus, although the capacity to acclimate to UV-radiation varied among the different species, data suggest that such responses are based on metabolic adjustments or possibly photoprotective strategies. In conclusion and taking into account the light adaptation characteristics, all species collected in the midlittoral and the upper sublittoral at the Strait of Magellan seem to be well acclimated to UV-B doses occurring at their habitat, which might be a pre-requisite to withstand enhanced solar UV-B during ozone depletion or summertime irradiance conditions. Key words: UV-radiation, macroalgae, photosynthesis, photoacclimation, Strait of Magellan. RESUMENLa actividad fotosintética de algas provenientes del Estrecho de Magallanes fue medida por primera vez con el propósito de determinar su fotoadaptación en terreno y su potencial de aclimatación a la radiación ultravioleta. Cinco especies fueron recolectadas desde la zona eulitoral y sublitoral superior: Ulva intestinalis, Porphyra columbina, Adenocystis utricularis, Desmarestia confervoides y D. ligulata. Curvas de fotosíntesis versus irradiancia (P-I) medidas en algas cultivadas en el laboratorio por más de una semana fueron usadas para determinar la aclimatación potencial de las algas en su hábitat. Tanto las ...

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Effects of UVB Radiation on the Initial Stages of Growth of Gigartina Skottsbergii, Sarcothalia Crispata and Mazzaella Laminarioides (Gigartinales, Rhodophyta)

Cited by 20 publications

References 42 publications

Iridaea cordata (Gigartinales, Rhodophyta): responses to artificial UVB radiation

Iridaea cordata (Gigartinales, Rhodophyta): responses to artificial UVB radiation

Seaweeds early development: detrimental effects of desiccation and attenuation by algal extracts

Photosynthetic responses to UV-radiation of intertidal macroalgae from the Strait of Magellan (Chile)

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