Early morning photosynthesis of the moss Tortula ruralis following summer dew fall in a Hungarian temperate dry sandy grassland |
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Authors: | Csintalan Zsolt Takács Zoltán Proctor Michael C.F. Nagy Zoltán Tuba Zoltán |
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Affiliation: | (1) Department of Botany and Plant Physiology, Szent istván University, 2103-Gödöll, Hungary;(2) Department of Biological Sciences, University of Exeter, Hatherly Laboratories, Exeter, UK |
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Abstract: | Air temperature and humidity, moss surface temperature, moss water content, and photosynthetically active radiation were measured through a clear dry night and early morning in July 1998; CO2 gas exchange of the moss was measured by infra-red gas analysis. The measurements showed progressive absorption of water by the moss through much of the night. The moss reached sufficient water content for about 1.5 h of positive net CO2 uptake immediately after dawn. The cumulative net carbon balance on this occasion was negative, but mornings with heavier dew could give a positive daily carbon balance, and short, early morning periods of photosynthesis during prolonged dry weather may mitigate long-term desiccation damage and allow for regular molecular repair. |
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Keywords: | Carbon balance Desiccation tolerance Rehydration |
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