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Article Dans Une Revue Philosophical Transactions of the Royal Society B: Biological Sciences Année : 2017

Response of CO 2 -starved diatom Phaeodactylum tricornutum to light intensity transition

Résumé

In this study, we investigated the responses of Phaeodactylum tricornutum cells acclimated to 300 µmol m−2 s−1 photon flux density to an increase (1000 µmol m−2 s−1) or decrease (30 µmol m−2 s−1) in photon flux densities. The light shift occurred abruptly after 5 days of growth and the acclimation to new conditions was followed during the next 6 days at the physiological and molecular levels. The molecular data reflect a rearrangement of carbon metabolism towards the production of phosphoenolpyruvic acid (PEP) and/or pyruvate. These intermediates were used differently by the cell as a function of the photon flux density: under low light, photosynthesis was depressed while respiration was increased. Under high light, lipids and proteins accumulated. Of great interest, under high light, the genes coding for the synthesis of aromatic amino acids and phenolic compounds were upregulated suggesting that the shikimate pathway was activated.

Dates et versions

hal-02490734 , version 1 (25-02-2020)

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Parisa Heydarizadeh, Wafâa Boureba, Morteza Zahedi, Bing Huang, Brigitte Moreau, et al.. Response of CO 2 -starved diatom Phaeodactylum tricornutum to light intensity transition. Philosophical Transactions of the Royal Society B: Biological Sciences, 2017, 372 (1728), pp.20160396. ⟨10.1098/rstb.2016.0396⟩. ⟨hal-02490734⟩
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