Intermittent low temperatures constrain spring recovery of photosynthesis in boreal Scots pine forests. Ensminger, I., Sveshnikov, D., Campbell, D. A., Funk, C., Jansson, S., Lloyd, J., Shibistova, O., & Oquist, G. Global Change Biology, 10(6):995–1008, June, 2004. Place: Hoboken Publisher: Wiley WOS:000221741800006doi abstract bibtex During winter and early spring, evergreen boreal conifers are severely stressed because light energy cannot be used when photosynthesis is pre-empted by low ambient temperatures. To study photosynthetic performance dynamics in a severe boreal climate, seasonal changes in photosynthetic pigments, chloroplast proteins and photochemical efficiency were studied in a Scots pine forest near Zotino, Central Siberia. In winter, downregulation of photosynthesis involved loss of chlorophylls, a twofold increase in xanthophyll cycle pigments and sustained high levels of the light stress-induced zeaxanthin pigment. The highest levels of xanthophylls and zeaxanthin did not occur during the coldest winter period, but rather in April when light was increasing, indicating an increased capacity for thermal dissipation of excitation energy at that time. Concomitantly, in early spring the D1 protein of the photosystem II (PSII) reaction centre and the light-harvesting complex of PSII dropped to their lowest annual levels. In April and May, recovery of PSII activity, chloroplast protein synthesis and rearrangements of pigments were observed as air temperatures increased above 0degreesC. Nevertheless, severe intermittent low-temperature episodes during this period not only halted but actually reversed the physiological recovery. During these spring low-temperature episodes, protective processes involved a complementary function of the PsbS and early light-induced protein thylakoid proteins. Full recovery of photosynthesis did not occur until the end of May. Our results show that even after winter cold hardening, photosynthetic activity in evergreens responds opportunistically to environmental change throughout the cold season. Therefore, climate change effects potentially improve the sink capacity of boreal forests for atmospheric carbon. However, earlier photosynthesis in spring in response to warmer temperatures is strongly constrained by environmental variation, counteracting the positive effects of an early recovery process.
@article{ensminger_intermittent_2004,
title = {Intermittent low temperatures constrain spring recovery of photosynthesis in boreal {Scots} pine forests},
volume = {10},
issn = {1354-1013},
doi = {10/bg8q75},
abstract = {During winter and early spring, evergreen boreal conifers are severely stressed because light energy cannot be used when photosynthesis is pre-empted by low ambient temperatures. To study photosynthetic performance dynamics in a severe boreal climate, seasonal changes in photosynthetic pigments, chloroplast proteins and photochemical efficiency were studied in a Scots pine forest near Zotino, Central Siberia. In winter, downregulation of photosynthesis involved loss of chlorophylls, a twofold increase in xanthophyll cycle pigments and sustained high levels of the light stress-induced zeaxanthin pigment. The highest levels of xanthophylls and zeaxanthin did not occur during the coldest winter period, but rather in April when light was increasing, indicating an increased capacity for thermal dissipation of excitation energy at that time. Concomitantly, in early spring the D1 protein of the photosystem II (PSII) reaction centre and the light-harvesting complex of PSII dropped to their lowest annual levels. In April and May, recovery of PSII activity, chloroplast protein synthesis and rearrangements of pigments were observed as air temperatures increased above 0degreesC. Nevertheless, severe intermittent low-temperature episodes during this period not only halted but actually reversed the physiological recovery. During these spring low-temperature episodes, protective processes involved a complementary function of the PsbS and early light-induced protein thylakoid proteins. Full recovery of photosynthesis did not occur until the end of May. Our results show that even after winter cold hardening, photosynthetic activity in evergreens responds opportunistically to environmental change throughout the cold season. Therefore, climate change effects potentially improve the sink capacity of boreal forests for atmospheric carbon. However, earlier photosynthesis in spring in response to warmer temperatures is strongly constrained by environmental variation, counteracting the positive effects of an early recovery process.},
language = {English},
number = {6},
journal = {Global Change Biology},
author = {Ensminger, I. and Sveshnikov, D. and Campbell, D. A. and Funk, C. and Jansson, S. and Lloyd, J. and Shibistova, O. and Oquist, G.},
month = jun,
year = {2004},
note = {Place: Hoboken
Publisher: Wiley
WOS:000221741800006},
keywords = {Pinus sylvestris, carbon balance, chlorophyll fluorescence, cold stress, light-use efficiency, northern forests, photoinhibition, photosystem-ii, pigment composition, psbs protein, seasonal variations, seasonal-changes, snow cover, stress, xanthophyll cycle},
pages = {995--1008},
}
Downloads: 0
{"_id":"KsJfCCtiKjfNR3gd9","bibbaseid":"ensminger-sveshnikov-campbell-funk-jansson-lloyd-shibistova-oquist-intermittentlowtemperaturesconstrainspringrecoveryofphotosynthesisinborealscotspineforests-2004","author_short":["Ensminger, I.","Sveshnikov, D.","Campbell, D. A.","Funk, C.","Jansson, S.","Lloyd, J.","Shibistova, O.","Oquist, G."],"bibdata":{"bibtype":"article","type":"article","title":"Intermittent low temperatures constrain spring recovery of photosynthesis in boreal Scots pine forests","volume":"10","issn":"1354-1013","doi":"10/bg8q75","abstract":"During winter and early spring, evergreen boreal conifers are severely stressed because light energy cannot be used when photosynthesis is pre-empted by low ambient temperatures. To study photosynthetic performance dynamics in a severe boreal climate, seasonal changes in photosynthetic pigments, chloroplast proteins and photochemical efficiency were studied in a Scots pine forest near Zotino, Central Siberia. In winter, downregulation of photosynthesis involved loss of chlorophylls, a twofold increase in xanthophyll cycle pigments and sustained high levels of the light stress-induced zeaxanthin pigment. The highest levels of xanthophylls and zeaxanthin did not occur during the coldest winter period, but rather in April when light was increasing, indicating an increased capacity for thermal dissipation of excitation energy at that time. Concomitantly, in early spring the D1 protein of the photosystem II (PSII) reaction centre and the light-harvesting complex of PSII dropped to their lowest annual levels. In April and May, recovery of PSII activity, chloroplast protein synthesis and rearrangements of pigments were observed as air temperatures increased above 0degreesC. Nevertheless, severe intermittent low-temperature episodes during this period not only halted but actually reversed the physiological recovery. During these spring low-temperature episodes, protective processes involved a complementary function of the PsbS and early light-induced protein thylakoid proteins. Full recovery of photosynthesis did not occur until the end of May. Our results show that even after winter cold hardening, photosynthetic activity in evergreens responds opportunistically to environmental change throughout the cold season. Therefore, climate change effects potentially improve the sink capacity of boreal forests for atmospheric carbon. However, earlier photosynthesis in spring in response to warmer temperatures is strongly constrained by environmental variation, counteracting the positive effects of an early recovery process.","language":"English","number":"6","journal":"Global Change Biology","author":[{"propositions":[],"lastnames":["Ensminger"],"firstnames":["I."],"suffixes":[]},{"propositions":[],"lastnames":["Sveshnikov"],"firstnames":["D."],"suffixes":[]},{"propositions":[],"lastnames":["Campbell"],"firstnames":["D.","A."],"suffixes":[]},{"propositions":[],"lastnames":["Funk"],"firstnames":["C."],"suffixes":[]},{"propositions":[],"lastnames":["Jansson"],"firstnames":["S."],"suffixes":[]},{"propositions":[],"lastnames":["Lloyd"],"firstnames":["J."],"suffixes":[]},{"propositions":[],"lastnames":["Shibistova"],"firstnames":["O."],"suffixes":[]},{"propositions":[],"lastnames":["Oquist"],"firstnames":["G."],"suffixes":[]}],"month":"June","year":"2004","note":"Place: Hoboken Publisher: Wiley WOS:000221741800006","keywords":"Pinus sylvestris, carbon balance, chlorophyll fluorescence, cold stress, light-use efficiency, northern forests, photoinhibition, photosystem-ii, pigment composition, psbs protein, seasonal variations, seasonal-changes, snow cover, stress, xanthophyll cycle","pages":"995–1008","bibtex":"@article{ensminger_intermittent_2004,\n\ttitle = {Intermittent low temperatures constrain spring recovery of photosynthesis in boreal {Scots} pine forests},\n\tvolume = {10},\n\tissn = {1354-1013},\n\tdoi = {10/bg8q75},\n\tabstract = {During winter and early spring, evergreen boreal conifers are severely stressed because light energy cannot be used when photosynthesis is pre-empted by low ambient temperatures. To study photosynthetic performance dynamics in a severe boreal climate, seasonal changes in photosynthetic pigments, chloroplast proteins and photochemical efficiency were studied in a Scots pine forest near Zotino, Central Siberia. In winter, downregulation of photosynthesis involved loss of chlorophylls, a twofold increase in xanthophyll cycle pigments and sustained high levels of the light stress-induced zeaxanthin pigment. The highest levels of xanthophylls and zeaxanthin did not occur during the coldest winter period, but rather in April when light was increasing, indicating an increased capacity for thermal dissipation of excitation energy at that time. Concomitantly, in early spring the D1 protein of the photosystem II (PSII) reaction centre and the light-harvesting complex of PSII dropped to their lowest annual levels. In April and May, recovery of PSII activity, chloroplast protein synthesis and rearrangements of pigments were observed as air temperatures increased above 0degreesC. Nevertheless, severe intermittent low-temperature episodes during this period not only halted but actually reversed the physiological recovery. During these spring low-temperature episodes, protective processes involved a complementary function of the PsbS and early light-induced protein thylakoid proteins. Full recovery of photosynthesis did not occur until the end of May. Our results show that even after winter cold hardening, photosynthetic activity in evergreens responds opportunistically to environmental change throughout the cold season. Therefore, climate change effects potentially improve the sink capacity of boreal forests for atmospheric carbon. However, earlier photosynthesis in spring in response to warmer temperatures is strongly constrained by environmental variation, counteracting the positive effects of an early recovery process.},\n\tlanguage = {English},\n\tnumber = {6},\n\tjournal = {Global Change Biology},\n\tauthor = {Ensminger, I. and Sveshnikov, D. and Campbell, D. A. and Funk, C. and Jansson, S. and Lloyd, J. and Shibistova, O. and Oquist, G.},\n\tmonth = jun,\n\tyear = {2004},\n\tnote = {Place: Hoboken\nPublisher: Wiley\nWOS:000221741800006},\n\tkeywords = {Pinus sylvestris, carbon balance, chlorophyll fluorescence, cold stress, light-use efficiency, northern forests, photoinhibition, photosystem-ii, pigment composition, psbs protein, seasonal variations, seasonal-changes, snow cover, stress, xanthophyll cycle},\n\tpages = {995--1008},\n}\n\n\n\n","author_short":["Ensminger, I.","Sveshnikov, D.","Campbell, D. A.","Funk, C.","Jansson, S.","Lloyd, J.","Shibistova, O.","Oquist, G."],"key":"ensminger_intermittent_2004","id":"ensminger_intermittent_2004","bibbaseid":"ensminger-sveshnikov-campbell-funk-jansson-lloyd-shibistova-oquist-intermittentlowtemperaturesconstrainspringrecoveryofphotosynthesisinborealscotspineforests-2004","role":"author","urls":{},"keyword":["Pinus sylvestris","carbon balance","chlorophyll fluorescence","cold stress","light-use efficiency","northern forests","photoinhibition","photosystem-ii","pigment composition","psbs protein","seasonal variations","seasonal-changes","snow cover","stress","xanthophyll cycle"],"metadata":{"authorlinks":{}}},"bibtype":"article","biburl":"https://bibbase.org/zotero/upscpub","dataSources":["fvfkWcShg3Mybjoog","Tu3jPdZyJF3j547xT","3zTPPmKj8BiTcpc6C","9cGcv2t8pRzC92kzs"],"keywords":["pinus sylvestris","carbon balance","chlorophyll fluorescence","cold stress","light-use efficiency","northern forests","photoinhibition","photosystem-ii","pigment composition","psbs protein","seasonal variations","seasonal-changes","snow cover","stress","xanthophyll cycle"],"search_terms":["intermittent","low","temperatures","constrain","spring","recovery","photosynthesis","boreal","scots","pine","forests","ensminger","sveshnikov","campbell","funk","jansson","lloyd","shibistova","oquist"],"title":"Intermittent low temperatures constrain spring recovery of photosynthesis in boreal Scots pine forests","year":2004}