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Title of Journal: Biol Plant

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Abbravation: Biologia Plantarum

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Publisher

Springer Netherlands

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DOI

10.1007/bf00246186

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ISSN

1573-8264

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Cryoproective role of ribitol in Emphasis Type="I

Authors: J Hájek P Váczi M Barták L Smejkal H Lipavská
Publish Date: 2009/11/24
Volume: 53, Issue: 4, Pages: 677-
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Abstract

Thalli of Xanthoparmelia somloensis with natural content of polyols control and polyolfree thalli acetonerinsed were used to study ribitol effects at low temperatures Thalli segments were cultivated in ribitol concentration of 32 or 50 mM for 168 h at temperatures +5 0 and −5 °C The chlorophyll fluorescence parameters potential yield of photochemical reactions in PS 2 variable to maximum fluorescence ratio Fv/Fm effective quantum yield of photochemical reactions in PS 2 ΦPS2 and nonphotochemical quenching NPQ were monitored in 24h intervals using an imaging system The effect of 32 mM ribitol on Fv/Fm and ΦPS2 was apparent only at −5 °C however the effect was seen throughout the whole exposure Surprisingly 50 mM ribitol concentration treatment led to a decrease in Fv/Fm and ΦPS2 and to an increase in NPQ values at −5 °C while no change was observed at 0 °C and +5 °C Acetonerinsing caused decrease of Fv/Fm ΦPS2 and NPQ

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