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Open AccessCommunication
Plants 2016, 5(2), 22; doi:10.3390/plants5020022

Short-Term Responses in Maximum Quantum Yield of PSII (Fv/Fm) to ex situ Temperature Treatment of Populations of Bryophytes Originating from Different Sites in Hokkaido, Northern Japan

1
Faculty of Environmental Earth Science, Hokkaido University, Sapporo, 060-0810 Hokkaido, Japan
2
The Swedish National Road and Transport Research Institute, Box 55685, SE-102 15 Stockholm, Sweden
*
Author to whom correspondence should be addressed.
Academic Editor: Sylvie Renault
Received: 11 January 2016 / Revised: 8 April 2016 / Accepted: 18 April 2016 / Published: 26 April 2016
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Abstract

There is limited knowledge available on the thermal acclimation processes for bryophytes, especially when considering variation between populations or sites. This study investigated whether short-term ex situ thermal acclimation of different populations showed patterns of site dependency and whether the maximum quantum yield of PSII (Fv/Fm) could be used as an indicator of adaptation or temperature stress in two bryophyte species: Pleurozium schreberi (Willd. ex Brid.) Mitt. and Racomitrium lanuginosum (Hedw.) Brid. We sought to test the hypothesis that differences in the ability to acclimate to short-term temperature treatment would be revealed as differences in photosystem II maximum yield (Fv/Fm). Thermal treatments were applied to samples from 12 and 11 populations during 12 or 13 days in growth chambers and comprised: (1) 10/5 °C; (2) 20/10 °C; (3) 25/15 °C; (4) 30/20 °C (12 hours day/night temperature). In Pleurozium schreberi, there were no significant site-dependent differences before or after the experiment, while site dependencies were clearly shown in Racomitrium lanuginosum throughout the study. Fv/Fm in Pleurozium schreberi decreased at the highest and lowest temperature treatments, which can be interpreted as a stress response, but no similar trends were shown by Racomitrium lanuginosum. View Full-Text
Keywords: stress; indicator; terrestrial; mosses; heat; cold stress; indicator; terrestrial; mosses; heat; cold
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jägerbrand, A.K.; Kudo, G. Short-Term Responses in Maximum Quantum Yield of PSII (Fv/Fm) to ex situ Temperature Treatment of Populations of Bryophytes Originating from Different Sites in Hokkaido, Northern Japan. Plants 2016, 5, 22.

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