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231225s1996 xx |||||o 00| ||eng c |
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|a 10.1111/j.1469-8137.1996.tb01882.x
|2 doi
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|a pubmed24n1080.xml
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|a (DE-627)NLM324178247
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|a (NLM)33863134
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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| 100 |
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|a Balaguer, Luis
|e verfasserin
|4 aut
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|a Potential effects of rising tropospheric concentrations of CO2 and O3 on green-algal lichens
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|c 1996
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Revised 19.04.2021
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Pormelia sulcata Taylor was used as a model to examine the effects of elevated CO2 and/or O3 on green algal lichens. Thalli were exposed for 30 d in duplicate controlled-environment chambers to two atmospheric concentrations of CO2 ('ambient' [350μmol mol-1 ] and 'elevated' [700μmol mol-1 ] 24 h d-1 ) and two O3 regimes ('non-polluted' air [CF, < 5 nmol mol-1 ] and 'polluted' air [15 nmol mol-1 overnight rising to a midday maximum of 75 nmol mol-1 ]), in a factorial design. Elevated CO2 , or elevated O3 depressed the light saturated rate of CO2 , assimilation Asat ) measured at ambient CO2 , by 30% and 18%, respectively. However, despite this effect ultrastructure) studies revealed increased lipid storage in cells of the photobiont in response to CO2 -enrichment. Simultaneous exposure to elevated O3 reduced CO2 -induced lipid accumulation and reduced Asat in an additive manner. Gold-antibody labelling revealed that the decline in photosynthetic capacity induced by elevated CO2 and/or O3 was accompanied by a parallel decrease in the concentration of Rubiscoa in the algal pyrenoid (r= 0.93). Interestingly, differences in the amount of Rubisco protein were not correlated with changes in pyrenoid volume. Measurements of in vivo chlorophyll-fluorescence induction kinetics showed that the decline in Asat induced by elevated CO2 , and/or O2 , was not associated with significant changes in the photochemical efficiency of photosystem (PS) II. Although the experimental conditions inevitably imposed some stress on the thalli, revealed as a significant decline in the efficiency of PS II photochemistry, and enhanced starch accumulation in the photobiont over the fornication period, the study shows that the green-algal lichen symbiosis might be influenced by future changes in atmospheric composition. Photosynthetic capacity, measured at ambient CO2 , was found to be reduced after a controlled 30 d exposure to elevated CO2 , and/or O3 and this effect was associated with a parallel decline in the amount of Rubisco in the pyrenoid of algal chloroplasts
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|a Journal Article
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|a Elevated CO2
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4 |
|a elevated O3
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|a lichens
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|a photosynthetic capacity
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|a ultrastructure
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1 |
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|a Valladares, Fernando
|e verfasserin
|4 aut
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| 700 |
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|a Ascaso, Carmen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Barnes, Jeremy D
|e verfasserin
|4 aut
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| 700 |
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|a DE Los Rios, Asuncion
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Manrique, Esteban
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Smith, Elizabeth C
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t The New phytologist
|d 1979
|g 132(1996), 4 vom: 18. Apr., Seite 641-652
|w (DE-627)NLM09818248X
|x 1469-8137
|7 nnns
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| 773 |
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|g volume:132
|g year:1996
|g number:4
|g day:18
|g month:04
|g pages:641-652
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|u http://dx.doi.org/10.1111/j.1469-8137.1996.tb01882.x
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