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- Title
Short-term effects of increased CO<sub>2</sub>, nitrate and temperature on photosynthetic activity in Ulva rigida (Chlorophyta) estimated by different pulse amplitude modulated fluorometers and oxygen evolution.
- Authors
Figueroa, Felix L; Bonomi-Barufi, Jose; Celis-Plá, Paula S M; Nitschke, Udo; Arenas, Francisco; Connan, Solene; Abreu, Maria Helena; Malta, Erik-J; Conde-Álvarez, Rafael; Chow, Fungyi; Mata, Maria Teresa; Meyerhoff, O; Robledo, Daniel; Stengel, Dagmar B
- Abstract
Short-term effects of p CO2 (700–380 ppm; High carbon (HC) and Low carbon (LC), respectively) and nitrate content (50–5 µM; High nitrogen (HN) and Low nitrogen (LN), respectively on photosynthesis were investigated in Ulva rigida (Chlorophyta) under solar radiation (in-situ) and in the laboratory under artificial light (ex-situ). After six days of incubation at ambient temperature (AT), algae were subjected to a 4 °C temperature increase (AT+4 °C) for 3 d. Both in-situ and ex-situ maximal electron transport rate (ETRmax) and in situ gross photosynthesis (GP), measured by O2 evolution, presented highest values under HCHN, and lowest under HCLN, across all measuring systems. Maximal quantum yield (F v /F m ), and ETRmax of photosystem (PS) II [ETR(II)max] and PSI [ETR(I)max], decreased under HCLN at AT+4 °C. Ex situ ETR was higher than in situ ETR. At noon, F v /F m decreased (indicating photoinhibition), whereas ETR(II)max and maximal non-photochemical quenching (NPQmax) increased. ETR(II)max decreased under AT+ 4 °C in contrast to F v /F m , photosynthetic efficiency (α ETR) and saturated irradiance (EK). Thus, U. rigida exhibited a decrease in photosynthesis under acidification, changing LN, and AT+4 °C. These results emphasize the importance of studying the interaction between environmental parameters using in-situ versus ex-situ conditions, when aiming to evaluate the impact of global change on marine macroalgae.
- Subjects
ULVA; GREEN algae; ELECTRON transport; SOLAR radiation; NITRATES; PHOTOSYSTEMS; CERAMIALES
- Publication
Journal of Experimental Botany, 2021, Vol 72, Issue 2, p491
- ISSN
0022-0957
- Publication type
Article
- DOI
10.1093/jxb/eraa473