@article {Blot2011,
	title = {Light history influences the response of the marine cyanobacterium Synechococcus sp. WH7803 to oxidative stress},
	journal = {Plant Physiology},
	volume = {156},
	year = {2011},
	note = {ISBN: 1532-2548 (Electronic) 0032-0889 (Linking) tex.mendeley-tags: 2011,rcc,sbr?hyto?app},
	pages = {1934{\textendash}1954},
	abstract = {Marine Synechococcus undergo a wide range of environmental stressors, especially high and variable irradiance, which may induce oxidative stress through the generation of reactive oxygen species (ROS). While light and ROS could act synergistically on the impairment of photosynthesis, inducing photodamage and inhibiting photosystem II repair, acclimation to high irradiance is also thought to confer resistance to other stressors. To identify the respective roles of light and ROS in the photoinhibition process and detect a possible light-driven tolerance to oxidative stress, we compared the photophysiological and transcriptomic responses of Synechococcus sp. WH7803 acclimated to low (LL) or high light (HL) to oxidative stress, induced by hydrogen peroxide (H2O2) or methylviologen. While photosynthetic activity was much more affected in HL than in LL cells, only HL cells were able to recover growth and photosynthesis after addition of 25 microM H2O2. Depending upon light conditions and H2O2 concentration, the latter oxidizing agent induced photosystem II inactivation through both direct damages to the reaction centres and inhibition of its repair cycle. Although the global transcriptome response appeared similar in LL and HL cells, some processes were specifically induced in HL cells that seemingly helped them withstand oxidative stress, including enhancement of photoprotection and ROS detoxification, repair of ROS-driven damages and regulation of redox state. Detection of putative LexA binding sites allowed the identification of the putative LexA regulon, which was down-regulated in HL compared to LL cells, but up-regulated by oxidative stress under both growth irradiances.},
	keywords = {2011, rcc, SBR$_\textrmP$hyto$_\textrmP$PM, sbr?hyto?app},
	url = {http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve\&db=PubMed\&dopt=Citation\&list_uids=21670225},
	author = {Blot, N and Mella-Flores, D and Six, C and Lecorguille, G and Boutte, C and Peyrat, A and Monnier, A and Ratin, M and Gourvil, P and Campbell, D A and Garczarek, L}
}
@article {Six2009,
	title = {Photosystem II and pigment dynamics among ecotypes of the green alga Ostreococcus},
	journal = {Plant Physiology},
	volume = {151},
	year = {2009},
	note = {tex.mendeley-tags: RCC809},
	pages = {379{\textendash}390},
	abstract = {We investigated the photophysiological response of three ecotypes of the picophytoplankter Ostreococcus and a larger prasinophyte Pyramimonas obovata to a sudden increase in light irradiance. The deepwater Ostreococcus sp. RCC809 showed very high susceptibility to primary photoinactivation, likely a consequence of high oxidative stress, which may relate to the recently noted plastid terminal oxidase activity in this strain. The three Ostreococcus ecotypes were all able of deploying modulation of photosystem II repair cycle in order to cope with the light increase, but the effective clearance of photoinactivated D1 protein appeared to be slower in the deep water Ostreococcus sp. RCC809, suggesting that this step is rate-limiting in the photosystem II repair cycle in this strain. The deepwater Ostreococcus moreover accumulated lutein and showed substantial use of the xanthophyll cycle under light stress, demonstrating its high sensitivity to light fluctuations. The sustained component of the non-photochemical quenching of fluorescence correlated well with the xanthophyll de-epoxidation activity. Comparisons with the larger prasinophyte Pyramimonas obovata suggest that the photophysiology of Ostreococcus ecotypes requires high photosystem II repair rates to counter a high susceptibility to photoinactivation, consistent with low pigment package effects in their minute-sized cells.},
	keywords = {rcc, RCC809, SBR$_\textrmP$hyto$_\textrmP$PM},
	doi = {10.1104/pp.109.140566},
	author = {Six, C and Sherrard, R and Lionard, M and Roy, S and Campbell, D A}
}
@article {Six2008,
	title = {Contrasting photoacclimation strategies in ecotypes of the eukayotic picoplankter {\textexclamdown}i{\textquestiondown}Ostreococcus{\textexclamdown}/i{\textquestiondown}},
	journal = {Limnology and Oceanography},
	volume = {53},
	year = {2008},
	note = {tex.mendeley-tags: 2008,rcc,sbr?hyto$_\textrmd$ipo,sbr?hyto?app},
	pages = {255{\textendash}265},
	abstract = {Ostreococcus, the smallest known marine picoeukaryote, includes low- and high-light ecotypes. To determine the basis for niche partitioning between Ostreococcus sp. RCC809, isolated from the bottom of the tropical Atlantic euphotic zone, and the lagoon strain Ostreococcus tauri, we studied their photophysiologies under growth irradiances from 15 mmol photons m22 s21 to 800 mmol photons m22 s21 with a common nutrient replete regime. With increasing growth irradiance, both strains down-regulated cellular chlorophyll a and chlorophyll b (Chl a and Chl b) content, increased xanthophyll de-epoxidation correlated with nonphotochemical excitation quenching, and accumulated lutein. Ribulose-1,5-bisphosphate carboxylase/oxygenase content remained fairly stable. Under low-growth irradiances of 15{\textendash}80 mmol photons m22 s21, O. sp. RCC809 had equivalent or slightly higher growth rates, lower Chl a, a higher Chl b : Chl a ratio, and a larger photosystem II (PSII) antenna than O. tauri. O. tauri was more phenotypically plastic in response to growth irradiance, with a larger dynamic range in growth rate, Chl a, photosystem cell content, and cellular absorption cross-section of PSII. Estimating the amino acid and nitrogen costs for photoacclimation showed that the deep-sea oceanic O. sp. RCC809 relies largely on lower nitrogen cost changes in PSII antenna size to achieve a limited range of s-type light acclimation. O. sp. RCC809, however, suffers photoinhibition under higher light. This limited capacity for photoacclimation is compatible with the stable low-light and nutrient conditions at the base of the euphotic layer of the tropical Atlantic Ocean. In the more variable, high-nutrient, lagoon environment, O. tauri can afford to use a higher cost n-type acclimation of photosystem contents to exploit a wider range of light.},
	keywords = {2008, rcc, SBR$_\textrmP$hyto$_\textrmD$PO, sbr?hyto$_\textrmd$ipo, sbr?hyto?app},
	doi = {10.4319/lo.2008.53.1.0255},
	author = {Six, C and Finkel, Z V and Rodriguez, F and Marie, D and Partensky, F and Campbell, D A}
}
