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  Soil temperature and intermittent frost modulate the rate of recovery of photosynthesis in Scots pine under simulated spring conditions

Ensminger, I., Schmidt, L., & Lloyd, J. (2008). Soil temperature and intermittent frost modulate the rate of recovery of photosynthesis in Scots pine under simulated spring conditions. New Phytologist, 177(2), 428-442. doi:10.1111/j.1469-8137.2007.02273.x.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-27BE-F Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-27BF-D
Genre: Journal Article

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 Creators:
Ensminger, I.1, Author              
Schmidt, L.2, Author
Lloyd, J.3, Author              
Affiliations:
1System Regulation, Department Stitt, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753327              
2External Organizations, ou_persistent22              
3Carbohydrate Molecular Physiology, Department Willmitzer, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753344              

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Free keywords: climate change cold stress photochemical and nonphotochemical quenching scots pine ( pinus sylvestris) xanthophyll cycle photosystem-ii chlorophyll fluorescence cold-acclimation seasonal-changes excitation-energy stomatal control air-temperature water relations winter stress abscisic-acid
 Abstract: An earlier onset of photosynthesis in spring for boreal forest trees is predicted as the climate warms, yet the importance of soil vs air temperatures for spring recovery remains to be determined. Effects of various soil- and air-temperature conditions on spring recovery of photosynthesis in Scots pine (Pinus sylvestris) seedlings were assessed under controlled environmental conditions. Using winter-acclimated seedlings, photosynthetic responses were followed after transfer to different simulated spring conditions. Recovery rates for photosynthetic electron transport and net CO2 uptake were slower in plants from cold or frozen soil compared with controls. In addition, a greater fraction of light absorbed was not used photochemically, but was dissipated thermally via xanthophyll cycle pigments. Intermittent frost events decreased photosynthetic capacity and increased thermal energy dissipation. Within a few days after frost events, photosynthetic capacity recovered to prefrost levels. After 18 d under spring conditions, no difference in the optimum quantum yield of photosynthesis was observed between seedlings that had been exposed to intermittent frost and control plants. These results show that, if air temperatures remain favourable and spells of subfreezing air temperatures are only of short duration, intermittent frost events delay but do not severely inhibit photosynthetic recovery in evergreen conifers during spring. Cold and/or frozen soils exert much stronger inhibitory effects on the recovery process, but they do not totally inhibit it.

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Language(s): eng - English
 Dates: 2008
 Publication Status: Published in print
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 Identifiers: ISI: ISI:000251766300016
DOI: 10.1111/j.1469-8137.2007.02273.x
ISSN: 0028-646X
URI: ://000251766300016 http://onlinelibrary.wiley.com/store/10.1111/j.1469-8137.2007.02273.x/asset/j.1469-8137.2007.02273.x.pdf?v=1&t=hbtidpzi&s=d4f03b240dd8bbe6c3e5d952fc39eeb1cd74aec5
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Title: New Phytologist
Source Genre: Journal
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Pages: - Volume / Issue: 177 (2) Sequence Number: - Start / End Page: 428 - 442 Identifier: -