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Seasonality and Small Spatial-Scale Variation of Chlorophyll a Fluorescence in Bryophyte Syntrichia ruralis [Hedw.] in Semi-Arid Sandy Grassland, Hungary

1
Doctoral School of Biological Sciences, Institute of Botany and Ecophysiology, Szent István University, Páter Károly utca 1., H-2100 Gödöllő, Hungary
2
Department of Botany, University of Veterinary Medicine, István utca. 2., H-1078 Budapest, Hungary
*
Author to whom correspondence should be addressed.
Plants 2020, 9(1), 92; https://doi.org/10.3390/plants9010092
Received: 19 November 2019 / Revised: 24 December 2019 / Accepted: 9 January 2020 / Published: 11 January 2020
(This article belongs to the Section Plant Physiology and Metabolism)
Bryophytes face challenges due to global climate change which is leading to in-depth research in monitoring and studying their photosynthetic activity. The aim of this preliminary experiment was to study the seasonal variation trend in the chlorophyll a fluorescence parameters, Fv/Fm (ratio of variable to maximum fluorescence), photochemical fluorescence quenching (qP), photochemical quantum yield of photosystem II (ΦPS II), fluorescence quenching (qN), and non-photochemical quenching (NPQ), in the moss cushions of Syntrichia ruralis [Hedw.] collected from semi-arid sandy dunes for two slopes i.e., north-east (NE) and south-west (SW) direction. Our results showed a seasonal and small-spatial scale variation trend in all chlorophyll fluorescence parameters. These variations are due to different seasonal conditions referring to different degrees of environmental stress. ΦPS II and qP values were maximum in winter and in spring seasons while Fv/Fm, NPQ and qN were maximum in summer. Based on the different exposition of dunes, the SW slope showed increased values of the effective quantum yield of PS II and qP in comparison to the NE slope due to the optimal microclimate conditions for their expansion. These results may refer to the future changing in diversification and coverage of the Syntrichia species in semi-arid sandy grassland due to more effective metabolism in the beneficial microclimatic conditions. View Full-Text
Keywords: desiccation tolerance; dune; photochemical quenching; non-photochemical quenching; poikilohydric; maximum photochemical efficiency of photosystem II; photochemical quantum yield of photosystem II; non-photochemical quenching desiccation tolerance; dune; photochemical quenching; non-photochemical quenching; poikilohydric; maximum photochemical efficiency of photosystem II; photochemical quantum yield of photosystem II; non-photochemical quenching
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Ruchika; Csintalan, Z.; Péli, E.R. Seasonality and Small Spatial-Scale Variation of Chlorophyll a Fluorescence in Bryophyte Syntrichia ruralis [Hedw.] in Semi-Arid Sandy Grassland, Hungary. Plants 2020, 9, 92.

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