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Photosynthesis in Chromera velia Represents a Simple System with High Efficiency

SYSNO ASEP	0390068
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Photosynthesis in Chromera velia Represents a Simple System with High Efficiency
Author(s)	Quigg, A. (US) Kotabová, Eva (MBU-M)_{RID, ORCID} Jarešová, Jana (MBU-M)_RID Kaňa, Radek (MBU-M)_{RID, ORCID} Šetlík, Jiří (MBU-M) Šedivá, Barbora (MBU-M) Komárek, Ondřej (MBU-M)_RID Prášil, Ondřej (MBU-M)_{RID, ORCID}
Source Title	PLoS ONE. - : Public Library of Science - ISSN 1932-6203 Roč. 7, č. 10 (2012), e47036
Number of pages	12 s.
Language	eng - English
Country	US - United States
Keywords	Photosynthesis ; Chromera velia ; RuBISCO
Subject RIV	EE - Microbiology, Virology
R&D Projects	IAA601410907 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR)
	GBP501/12/G055 GA ČR - Czech Science Foundation (CSF)
	GAP501/12/0304 GA ČR - Czech Science Foundation (CSF)
Institutional support	MBU-M - RVO:61388971
UT WOS	000312385200071
DOI	10.1371/journal.pone.0047036
Annotation	Chromera velia (Alveolata) is a close relative to apicomplexan parasites with a functional photosynthetic plastid. Even though C. velia has a primitive complement of pigments (lacks chlorophyll c) and uses an ancient type II form of RuBISCO, we found that its photosynthesis is very efficient with the ability to acclimate to a wide range of irradiances. C. velia maintain similar maximal photosynthetic rates when grown under continual light-limited (low light) or light-saturated (high light) conditions. This flexible acclimation to continuous light is provided by an increase of the chlorophyll content and photosystem II connectivity under light limited conditions and by an increase in the content of protective carotenoids together with stimulation of effective non-photochemical quenching under high light. C. velia is able to significantly increase photosynthetic rates when grown under a light-dark cycle with sinusoidal changes in light intensity. Photosynthetic activities were nonlinearly related to light intensity, with maximum performance measured at midmorning. C. velia efficiently acclimates to changing irradiance by stimulation of photorespiration and non-photochemical quenching, thus avoiding any measurable photoinhibition. We suggest that the very high CO2 assimilation rates under sinusoidal light regime are allowed by activation of the oxygen consuming process (possibly chlororespiration) that maintains high efficiency of RuBISCO (type II). Despite the overall simplicity of the C. velia photosynthetic system, it operates with great efficiency
Workplace	Institute of Microbiology
Contact	Eliška Spurná, eliska.spurna@biomed.cas.cz, Tel.: 241 062 231
Year of Publishing	2013

Number of the records: 1