Synergistic effects of temperature and light on photoprotection in the model diatom Phaeodactylum tricornutum.

Diatoms dominate phytoplankton communities in turbulent waters, where light fluctuations can be frequent and intense. Due to this complex environment, these heterokont microalgae display remarkable photoprotection strategies, including a fast Non-Photochemical Quenching (NPQ). However, in nature, several abiotic parameters (such as temperature) can influence the response of photosynthetic organisms to light stress in a synergistic or antagonistic manner.

A Knockout of the Photoreceptor PtAureo1a Results in Altered Diel Expression of Diatom Clock Components.

Plants and algae use light not only for driving photosynthesis but also to sense environmental cues and to adjust their circadian clocks via photoreceptors. Aureochromes are blue-light-dependent photoreceptors that also function as transcription factors, possessing both a LOV and a bZIP domain. Aureochromes so far have only been detected in Stramenopile algae, which include the diatoms.

Twenty four-hour passive heat and cold exposures did not modify energy intake and appetite but strongly modify food reward.

Effects of acute thermal exposures on appetite appear hypothetical in reason of very heterogeneous methodologies. The aim of this study was therefore to clearly define the effects of passive 24-h cold (16°C) and heat (32°C) exposures on appetitive responses compared with a thermoneutral condition (24°C). Twenty-three healthy, young and active male participants realised three sessions (from 13.

Functional demonstration of Aureochrome 1a proteasomal degradation after blue light incubation in the diatom Phaeodactylum tricornutum.

Aureochromes (AUREOs) are both blue light photoreceptors and transcription factors found in diatoms and related algal groups that play a critical role in regulating gene and cell physiology. One of the AUREOs in the diatom Phaeodactylum tricornutum, PtAUREO1a, has been demonstrated to significantly influence global cellular transcription upon blue light exposure. PtAUREO1a itself is highly regulated on the gene transcription level, depending on the light conditions.

Identification of promoter targets by Aureochrome 1a in the diatom Phaeodactylum tricornutum.

Aureochromes (AUREOs) are unique blue light receptors and transcription factors found only in stramenopile algae. While each of the four AUREOs identified in the diatom Phaeodactylum tricornutum may have a specific function, PtAUREO1a has been shown to have a strong impact on overall gene regulation, when light changes from red to blue light conditions. Despite its significance, the molecular mechanism of PtAUREO1a is largely unexplored.