کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6304146 | 1618424 | 2014 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Photophysiological responses of Southern Ocean phytoplankton to changes in CO2 concentrations: Short-term versus acclimation effects
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کلمات کلیدی
DBSMtFNaHCO3Chl aETRNPQNADPHMIMSDICECAF0′HEPES2-[4-(2-hydroxyethyl)-1-piperazinyl]ethanesulfonic acid - 2- [4- (2-hydroxyethyl) -1-piperazinyl] ethanesulfonic acidCCm - CCMFm′ - Fm 'Fv/Fm - Fv / FmHCO3− - HCO3-Fire - آتشAdenosine Triphosphate - آدنوزین تری فسفاتATP - آدنوزین تری فسفات یا ATPOxygen - اکسیژنBicarbonate - بی کربنات، هیدروژن کربناتIrradiance - تابش نورconversion factor - تبدیل فاکتورminimum fluorescence - حداقل فلورسانسmaximum fluorescence - حداکثر فلورسنسNon-photochemical quenching - خنک سازی غیر فتوشیمیاییCarbon dioxide - دیاکسید کربنsodium bicarbonate - سدیم بیکربناتMembrane inlet mass spectrometry - طیف سنجی جرم ورودی غشاءcarbon concentrating mechanism - مکانیسم تمرکز کربنNADH - نادانElectron transport rate - نرخ انتقال الکترونnicotinamide adenine dinucleotide phosphate - نیکوتین آمید adenine dinucleotide phosphateNAD, nicotinamide adenine dinucleotide - نیکوتینامید آدنین دینوکلئوتیدCO2 - کربن دیاکسیدdissolved inorganic carbon - کربن غیر آلی حل شدهinorganic carbon - کربن معدنیChlorophyll a - کلروفیل a
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم آبزیان
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The present study examines how different pCO2 acclimations affect the CO2- and light-dependence of photophysiological processes and O2 fluxes in four Southern Ocean (SO) key phytoplankton species. We grew Chaetoceros debilis (Cleve), Pseudo-nitzschia subcurvata (Hasle), Fragilariopsis kerguelensis (O'Meara) and Phaeocystis antarctica (Karsten) under low (160 μatm) and high (1000 μatm) pCO2. The CO2- and light-dependence of fluorescence parameters of photosystem II (PSII) were determined by means of a fluorescence induction relaxation system (FIRe). In all tested species, nonphotochemical quenching (NPQ) is the primary photoprotection strategy in response to short-term exposure to high light or low CO2 concentrations. In C. debilis and P. subcurvata, PSII connectivity (p) and functional absorption cross-sections of PSII in ambient light (ÏPSIIâ²) also contributed to photoprotection while changes in re-oxidation times of Qa acceptor (ÏQa) were more significant in F. kerguelensis. The latter was also the only species being responsive to high acclimation pCO2, as these cells had enhanced relative electron transport rates (rETRs) and ÏPSIIâ² while ÏQa and p were reduced under short-term exposure to high irradiance. Low CO2-acclimated cells of F. kerguelensis and all pCO2 acclimations of C. debilis and P. subcurvata showed dynamic photoinhibition with increasing irradiance. To test for the role and presence of the Mehler reaction in C. debilis and P. subcurvata, the light-dependence of O2 fluxes was estimated using membrane inlet mass spectrometry (MIMS). Our results show that the Mehler reaction is absent in both species under the tested conditions. We also observed that dark respiration was strongly reduced under high pCO2 in C. debilis while it remained unaltered in P. subcurvata. Our study revealed species-specific differences in the photophysiological responses to pCO2, both on the acclimation as well as the short-term level.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Experimental Marine Biology and Ecology - Volume 451, February 2014, Pages 44-54
Journal: Journal of Experimental Marine Biology and Ecology - Volume 451, February 2014, Pages 44-54
نویسندگان
Scarlett Trimborn, Silke Thoms, Katherina Petrou, Sven A. Kranz, Björn Rost,