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000056247 0247_ $$2pmc$$apmc:PMC1820919
000056247 0247_ $$2DOI$$a10.1104/pp.106.092312
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000056247 041__ $$aeng
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000056247 084__ $$2WoS$$aPlant Sciences
000056247 1001_ $$0P:(DE-Juel1)VDB3441$$aBusch, F.$$b0$$uFZJ
000056247 245__ $$aIncreased air temperature during simulated autumn conditions does not increase photosynthetic carbon gain but affects the dissipation of excess energy in seedlings of the evergreen conifer Jack Pine
000056247 260__ $$aRockville, Md.: Soc.$$bJSTOR$$c2007
000056247 300__ $$a1242 - 1251
000056247 3367_ $$0PUB:(DE-HGF)16$$2PUB:(DE-HGF)$$aJournal Article
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000056247 440_0 $$04987$$aPlant Physiology$$v143$$x0032-0889
000056247 500__ $$aRecord converted from VDB: 12.11.2012
000056247 520__ $$aTemperature and daylength act as environmental signals that determine the length of the growing season in boreal evergreen conifers. Climate change might affect the seasonal development of these trees, as they will experience naturally decreasing daylength during autumn, while at the same time warmer air temperature will maintain photosynthesis and respiration. We characterized the down-regulation of photosynthetic gas exchange and the mechanisms involved in the dissipation of energy in Jack pine (Pinus banksiana) in controlled environments during a simulated summer-autumn transition under natural conditions and conditions with altered air temperature and photoperiod. Using a factorial design, we dissected the effects of daylength and temperature. Control plants were grown at either warm summer conditions with 16-h photoperiod and 22 degrees C or conditions representing a cool autumn with 8 h/7 degrees C. To assess the impact of photoperiod and temperature on photosynthesis and energy dissipation, plants were also grown under either cold summer (16-h photoperiod/7 degrees C) or warm autumn conditions (8-h photoperiod/22 degrees C). Photosynthetic gas exchange was affected by both daylength and temperature. Assimilation and respiration rates under warm autumn conditions were only about one-half of the summer values but were similar to values obtained for cold summer and natural autumn treatments. In contrast, photosynthetic efficiency was largely determined by temperature but not by daylength. Plants of different treatments followed different strategies for dissipating excess energy. Whereas in the warm summer treatment safe dissipation of excess energy was facilitated via zeaxanthin, in all other treatments dissipation of excess energy was facilitated predominantly via increased aggregation of the light-harvesting complex of photosystem II. These differences were accompanied by a lower deepoxidation state and larger amounts of beta-carotene in the warm autumn treatment as well as by changes in the abundance of thylakoid membrane proteins compared to the summer condition. We conclude that photoperiod control of dormancy in Jack pine appears to negate any potential for an increased carbon gain associated with higher temperatures during the autumn season.
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000056247 588__ $$aDataset connected to Web of Science, Pubmed
000056247 650_2 $$2MeSH$$aCarbohydrate Metabolism
000056247 650_2 $$2MeSH$$aCarbon: metabolism
000056247 650_2 $$2MeSH$$aCarbon Dioxide: metabolism
000056247 650_2 $$2MeSH$$aChlorophyll: metabolism
000056247 650_2 $$2MeSH$$aEnergy Metabolism
000056247 650_2 $$2MeSH$$aFluorescence
000056247 650_2 $$2MeSH$$aPhotoperiod
000056247 650_2 $$2MeSH$$aPhotosynthesis
000056247 650_2 $$2MeSH$$aPigments, Biological: metabolism
000056247 650_2 $$2MeSH$$aPinus: growth & development
000056247 650_2 $$2MeSH$$aPinus: metabolism
000056247 650_2 $$2MeSH$$aSaskatchewan
000056247 650_2 $$2MeSH$$aSeasons
000056247 650_2 $$2MeSH$$aSeedling: metabolism
000056247 650_2 $$2MeSH$$aTemperature
000056247 650_7 $$00$$2NLM Chemicals$$aPigments, Biological
000056247 650_7 $$0124-38-9$$2NLM Chemicals$$aCarbon Dioxide
000056247 650_7 $$01406-65-1$$2NLM Chemicals$$aChlorophyll
000056247 650_7 $$07440-44-0$$2NLM Chemicals$$aCarbon
000056247 650_7 $$2WoSType$$aJ
000056247 7001_ $$0P:(DE-HGF)0$$aHüner, N. P. A.$$b1
000056247 7001_ $$0P:(DE-HGF)0$$aEnsminger, I.$$b2
000056247 773__ $$0PERI:(DE-600)2004346-6$$a10.1104/pp.106.092312$$gVol. 143, p. 1242 - 1251$$p1242 - 1251$$q143<1242 - 1251$$tPlant physiology$$v143$$x0032-0889$$y2007
000056247 8567_ $$2Pubmed Central$$uhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1820919
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000056247 9141_ $$y2007
000056247 915__ $$0StatID:(DE-HGF)0010$$aJCR/ISI refereed
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