Changes in glutathione and xanthophyll cycle pigments in the high light-stressed lichens Umbilicaria antarctica and Lasallia pustulata

Vráblíková, Hana; Barták, Miloš; Wonisch, Astrid

doi:10.1016/j.jphotobiol.2004.11.017

Cited by 30 publications

(20 citation statements)

References 34 publications

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“…Such dehydration-dependent decrease in photosynthesis is accompanied by the activation of protective mechanisms that protect components of photosystem II from damages. These mechanisms are similar to those activated in lichens during photoinhibition and include interconversion of xantophyll cycle pigments (Calatayud et al 1997, Vráblíková et al 2005. They comprise several pathways of thermal energy dissipation (Heber et al 2007(Heber et al , 2010 that act in reaction centers of PS II during lichen dehydration.…”

Section: Discussionmentioning

confidence: 90%

Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation

Jupa¹,

Hájek²,

Hazdrová³

et al. 2012

Czech Polar Rep.

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This study aimed to evaluate the effective photosynthetic quantum yield ( PSII ) and the Photochemical Reflectance Index (PRI) for assessment of photosynthetic performance of two Umbilicaria lichens during gradual desiccation of their thalli. U. cylindrica and U. decussata exhibited curvilinear relationship (S-shape curve) of decreasing  PSII values with decreasing water potential (WP) of thalli. During initial phase of desiccation (WP from 0 to -10 MPa), no decrease of  PSII was apparent, further desiccation (WP from -10 to -20 MPa) led to fast  PSII decrease from 0.6 to 0.1 indicating strong inhibition of photosynthetic processes. Critical WP at which photosythetic processes are fully inhibited was found bellow -25 MPa in both lichen species. Photochemical Reflectance Index (PRI) exhibited curvilinear increase with thalli desiccation (decreasing WP). At full thallus hydration, the PRI reached the value of -0.18 in both species. Under strong dehydration (WP from -20 to -30 MPa), however, U. cylindrica showed somewhat lower value (-0.04) than U.decussata (-0.02 MPa). PRI to WP relationship is discussed and compared to existing evidence from higher plants and poikilohydric organisms.

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Section: Discussionmentioning

confidence: 90%

Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation

Jupa¹,

Hájek²,

Hazdrová³

et al. 2012

Czech Polar Rep.

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“…In general, active protection of the photobiont may involve the xanthophyll cycle (Vráblíková et al 2005) through the activation of the enzyme violaxanthin de-epoxidase, which drives the conversion of violaxanthin via antheraxanthin to zeaxanthin, and then zeaxanthin dissipates excess energy in the form of heat (Havaux & Niyogi 1999). Photoinhibition has higher probability to occur in those lichen species with a limited pool of xanthophyll cycle pigments and may occur in the field at least under specific combinations of some environmental factors such as full hydration of the thalli, extreme temperature and high irradiance.…”

Section: Discussionmentioning

confidence: 99%

Influence of sun irradiance and water availability on lichen photosynthetic pigments during a Mediterranean summer

et al. 2010

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This study was carried out to investigate changes in lichen photosynthetic pigments induced by different combinations of light irradiance and water availability during a Mediterranean summer. To this purpose, thalli of three epiphytic lichens with a markedly different ecology concerning photo-hygrophytism, namely Evernia prunastri (hygro-mesophytic), Flavoparmelia caperata (mesophytic) and Xanthoria parietina (xero-mesophytic), were transplanted for 30 days to N-and S-facing cardinal exposures in central Italy. To investigate the effect of thallus hydration, at each cardinal exposure 50% of thalli were hydrated daily with deionised water. The results showed that changes in the concentrations of photosynthetic pigments are species-specific and consist in a general depression of photosynthetic pigments only in the hygro-mesophytic species E. prunastri. The pattern of photosynthetic pigments was also investigated in spontaneous samples along contrasting aspects. In this case, X. parietina from S-facing slopes, adapted to direct solar influx, showed higher pigment content than N-facing thalli; F. caperata and E. prunastri avoid direct extreme solar radiation and assimilation pigments were influenced more by the shadowing of tree canopies than by the cardinal exposure. The influence of drought on lichen photosynthetic pigments in the Mediterranean area is discussed.

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“…This effect, however, was not observed in cyanolichens. Short-term changes in gluthatione pool (Vráblíková et al 2005), as well as its redox state is another antioxidative mechanism activated by high light in chlorolichens (Štěpigová et al 2007). Content of carotenoids (Valladares et al 1995) and phenolic compounds (Buffoni Hall et al 2002) is also reported to protect lichens form light-induced ROS, especially the environments rich in high UV-B.…”

Section: Introductionmentioning

confidence: 99%

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II

Barták¹,

Hájek²,

Očenášová³

2012

Czech Polar Rep.

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The paper deals with the differences in sensitivity of Antarctic lichen to photoinhibition. Thalli of Usnea antarctica were collected at the James Ross Island, Antarctica (57°52´57´´W, 63°48´02´´S) and transferred in dry state to the Czech Republic. After rewetting in a laboratory, they were exposed to 2 high light treatments: short-term (30 min), and long-term (6 h). In short-term treatment, the sample were exposed to 1000 and 2000 µmol m -2 s -1 of photosynthetically active radiation (PAR). In long-term experiment, PAR of 300, 600, and 1000 µmol m -2 s -1 were used. Photosynthetic efficiency of U. antarctica thalli was monitored by chlorophyll fluorescence parameters, potential (F V /F M ) and actual ( PSII ) quantum yield of photochemical processes in photosystem II in particular. In short-term treatments, the F 0 , F V and F M signals, as well as the values of F V /F M , and  PSII showed light-induced decrease, however substantial recovery after consequent 30 min. in dark. Longer exposition (60 min) to high light led to more pronounced decrease in chlorophyll fluorescence than after 30 min treatment, however dark recovery was faster in the thalli treated before for longer time (60 min). Long-term treatment by high light caused gradual decrease in F V /F M and  PSII with the time of exposition. The extent of the decrease was found light dose-dependent. The time course was biphasic for F V /F M but not for  PSII . The study showed that wet thalli of Usnea antarctica had high capacity of photoprotective mechanisms to cope well either with short-or long-term high light stress. This might be of particular importance in the field at the James Ross Island, particularly at the begining of growing season when melting water is available and, simultaneously, high light stress may happen on fully sunny days. 43

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Changes in glutathione and xanthophyll cycle pigments in the high light-stressed lichens Umbilicaria antarctica and Lasallia pustulata

Cited by 30 publications

References 34 publications

Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation

Interspecific differences in photosynthetic efficiency and spectral reflectance in two Umbilicaria species from Svalbard during controlled desiccation

Influence of sun irradiance and water availability on lichen photosynthetic pigments during a Mediterranean summer

Photoinhibition of photosynthesis in Antarctic lichen Usnea antarctica. I. Light intensity- and light duration-dependent changes in functioning of photosystem II

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