UVB effects on early developmental stages of commercially important macroalgae in southern Chile

Navarro, Núria; Mansilla, Andrés; Palacios, Mauricio

doi:10.1007/s10811-007-9276-2

Cited by 15 publications

(8 citation statements)

References 41 publications

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“…In the present study, the effect of UV‐B and UV‐A radiation on spore liberation of U. fasciata and G. corticata was investigated. The findings described in this study are of significant importance as UV radiation has a major impact on the recruitment of seaweed populations in intertidal ecosystem (Navarro et al . 2008).…”

Section: Introductionmentioning

confidence: 62%

Influence of ultraviolet radiation on spore liberation in marine macroalgae Ulva fasciata (Ulvales, Chlorophyceae) and Gracilaria corticata (Gracilariales, Rhodophyceae)

Ganesan

Veeragurunathan

Eswaran

et al. 2010

Phycological Research

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The effect of ultraviolet-B (UV-B) and UV-A radiation on spore liberation in the intertidal marine macroalgae Ulva fasciata Delile (Chlorophyceae) and Gracilaria corticata J.Agardh (Rhodophyceae) was investigated. The two algae were exposed to UV-A and UV-B radiation separately for 10, 20, 30, 45 and 60 min and percentage inhibition of spore liberation was determined in controlled laboratory conditions. The spore liberation period in UV treated algae was extended for 4 days in U. fasciata and 9 days in G. corticata. UV-B radiation inhibited spore liberation as much as 76.6% in U. fasciata and 55.5% in G. corticata at 60 min exposure. A significant positive correlation was observed between percentage inhibition of spore liberation and length of UV-B exposure in both U. fasciata and in G. corticata. Similarly, UV-A radiation also inhibited spore liberation as much as 75% in the former and 50% in the latter. There was a significant correlation between inhibition of spore liberation and length of UV-A exposure in U. fasciata and in G. corticata. Analysis of variance results showed inhibition of spore liberation at 60 min of UV exposure differed significantly with that of other exposure lengths. The present findings reveal that UV-A radiation also had an impact on spore liberation but to a lesser extent than UV-B radiation. Thallus thickness and plant location on the shore determines their exposure to UV radiation. High UV impact was seen for U. fasciata growing in the upper parts of the intertidal region with a thin sheet like thallus and high surface area resulting in higher inhibition of spore liberation than in G. corticata.

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Section: Introductionmentioning

confidence: 62%

Influence of ultraviolet radiation on spore liberation in marine macroalgae Ulva fasciata (Ulvales, Chlorophyceae) and Gracilaria corticata (Gracilariales, Rhodophyceae)

Ganesan

Veeragurunathan

Eswaran

et al. 2010

Phycological Research

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“…The morphological alterations caused by UVB in Iridaea cordata, evident as curling of young gametophytes and young fronds, would resemble those changes occurring in leaves of higher plants (reviewed by Greenberg et al 1997) and macroalgae (Navarro et al 2008(Navarro et al , 2009. This curling could be considered an acclimation process that aims to reduce the area exposed to UVB, thus acting as a mechanism of protection against radiation (Navarro et al 2008(Navarro et al , 2009. Moreover, this defense mechanism would not be related to the energy available for growth.…”

Section: Discussionmentioning

confidence: 99%

“…It has been reported that high levels of UVA and PAR increase the induction of mechanisms for repairing damage and protection against UVB, also increasing tolerance to UVB (Takayanagi et al 1994, Franklin & Forster 1997, van de Poll et al 2001. Nevertheless UVA also inhibited the growth of embryos of Gigartina skottsbergii Setchell & Gardner (Navarro et al 2008), caused a reduction of photosynthetic efficiency in I. cordata tetraspores (Zacher et al 2009), increased the permeability of chloroplasts membrane (Iwanzik et al 1983), and caused photoinhibition in 13 red species from intertidal and subtidal of Helgoland (Dring et al 1996a). In the same way, the UVA radiation was responsible for over 50% of the total inhibition due to UVR in natural phytoplankton populations from both Antarctic and tropical waters (Helbling et al 1992).…”

Section: Discussionmentioning

confidence: 99%

“…Such studies are necessary because the morphology and integrity of algae present a holistic and integrated indicator of damage occurring on several levels (Roleda et al 2004, Navarro et al 2009. Additionally, changes in morphology could be important defense mechanisms for algae (Navarro et al 2008), especially for early developmental stages, due their vulnerability to environmental stresses when compared to adult macrothalli. Research evaluating the effects of UVB radiation on early developmental stages and spores is not frequent in literature.…”

Section: Introductionmentioning

confidence: 99%

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Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation

Navarro

Palacios

Mansilla

et al. 2010

Rev. biol. mar. oceanogr.

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“…, Navarro et al. ), with a potential influence on the vertical zonation of macroalgae (e.g., Wiencke et al. , and see review in Bischof et al.…”

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confidence: 99%

Differential responses of tetrasporophytes and gametophytes of Mazzaella laminarioides (Gigartinales, Rhodophyta) under solar UV radiation

Navarro

Figueroa

Korbee

et al. 2016

Journal of Phycology

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The effects of solar UV radiation on mycosporine-like amino acids (MAAs), growth, photosynthetic pigments (Chl a, phycobiliproteins), soluble proteins (SP), and C and N content of Mazzaella laminarioides tetrasporophytes and gametophytes were investigated. Apical segments of tetrasporophytes and gametophytes were exposed to solar radiation under three treatments (PAR [P], PAR+UVA [PA], and PAR+UVA+UVB [PAB]) during 18 d in spring 2009, Punta Arenas, Chile. Samples were taken after 2, 6, 12, and 18 d of solar radiation exposure. Most of the parameters assessed on M. laminarioides were significantly influenced by the radiation treatment, and both gametophytes and tetrasporophytes seemed to respond differently when exposed to high UV radiation. The two main effects promoted by UV radiation were: (i) higher synthesis of MAAs in gametophytes than tetrasporophytes at 2 d, and (ii) a decrease in phycoerythrin, phycocyanin, and SPs, but an increase in MAA content in tetrasporophytes at 6 and 12 d of culture. Despite some changes that were observed in biochemical parameters in both tetrasporophytes and gametophytes of M. laminarioides when exposed to UVB radiation, these changes did not promote deleterious effects that might interfere with the growth in the long term (18 d). The tolerance and resistance of M. laminarioides to higher UV irradiance were expected, as this intertidal species is exposed to variation in solar radiation, especially during low tide.

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UVB effects on early developmental stages of commercially important macroalgae in southern Chile

Abstract: High levels of ultraviolet-B radiation (UVB) could represent a danger to seaweeds by affecting their physiological processes and development.

Cited by 15 publications

References 41 publications

Influence of ultraviolet radiation on spore liberation in marine macroalgae Ulva fasciata (Ulvales, Chlorophyceae) and Gracilaria corticata (Gracilariales, Rhodophyceae)

Influence of ultraviolet radiation on spore liberation in marine macroalgae Ulva fasciata (Ulvales, Chlorophyceae) and Gracilaria corticata (Gracilariales, Rhodophyceae)

Morphological and growth alterations on early development stages of Iridaea cordata (Rhodophyta) under different intensities of UVB radiation

Differential responses of tetrasporophytes and gametophytes of Mazzaella laminarioides (Gigartinales, Rhodophyta) under solar UV radiation

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