9 research outputs found
Structural organization, thermal stability, and excitation energy utilization of pea thylakoid membranes adapted to low light conditions
Control of RNP motility and localization by a splicing-dependent structure in oskar mRNA
Control of antiferromagnetic domain distribution via polarization-dependent optical annealing
The synergistic effect of Selenium (selenite, –SeO3 2−) dose and irradiance intensity in Chlorella cultures
Photobiochemical changes in Chlorella g120 culture during trophic conversion (metabolic pathway shift) from heterotrophic to phototrophic growth regime
Physiological and photobiochemical changes and growth in the heterotrophic strain Chlorella vulgaris g120 were studied during
trophic conversion from heterotrophic to phototrophic growth regime. After the exposure of the Chlorella g120 culture to light, it
revealed a significant activity of the electron transport (450–700 μmol e− m−2 s
−1 as measured by chlorophyll fluorescence) and
high PSII photochemical yield Fv/Fm between 0.7 and 0.8. Fast fluorescence induction kinetics showed that PSII electron
acceptors in the plastoquinone pool remained partly oxidized, indicating no downregulation of PSII electron transport. The data
further revealed that high photobiochemical activity is lost in futile (protective) processes of non-photochemical quenching and
respiration which indicate that surplus energy is dissipated in these processes. Pigment analysis showed low chlorophyll content
− 0.35–1.15% as compared with exclusively phototrophic strain Chlorella vulgaris R-117. Nevertheless, the carotenoid content
in g120 was relatively high − 0.20–0.33% of dry weight which resulted in a considerably high ratio of carotenoid/chlorophyll −
0.31–0.44. This strain probably does not possess the fully competent photosynthetic apparatus and can only partially adapt to
phototrophy. We show that the heterotrophically grown g120 strain can undergo metabolic shift from heterotrophic to
phototrophic growth regime. It might be an interesting strain from biotechnological point of view as a source of carotenoids,
especially lutein.Czech Academy of Sciences/[CNR-16-29]/CAS/República ChecaNational Council of Research of Italy/[CNR-16-29]/Cnr-Iia/RomaEuropean Commission/[727874]/EU/ünión EuropeaMinistry of Education, Youth and Sports/[Algatech Plus LO1416]/MSMT/República ChecaUCR::Vicerrectoría de Docencia::Ciencias Básicas::Facultad de Ciencias::Escuela de BiologíaUCR::Vicerrectoría de Investigación::Unidades de Investigación::Ciencias Básicas::Centro de Investigación en Ciencias del Mar y Limnología (CIMAR