Light-dependent signal transduction in the marine diatom Phaeodactylum tricornutum

Unlike most higher plants, unicellular algae can acclimate to changes in irradiance on time scales of hours to a few days. The process involves an enigmatic signaling pathway originating in the plastid that leads to coordinated changes in plastid and nuclear gene expression. To deepen our understand...

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Veröffentlicht in:Proceedings of the National Academy of Sciences - PNAS 2023-03, Vol.120 (11), p.e2216286120-e2216286120
Hauptverfasser: Agarwal, Ananya, Levitan, Orly, Cruz de Carvalho, Helena, Falkowski, Paul G
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Sprache:eng
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Zusammenfassung:Unlike most higher plants, unicellular algae can acclimate to changes in irradiance on time scales of hours to a few days. The process involves an enigmatic signaling pathway originating in the plastid that leads to coordinated changes in plastid and nuclear gene expression. To deepen our understanding of this process, we conducted functional studies to examine how the model diatom, acclimates to low light and sought to identify the molecules responsible for the phenomenon. We show that two transformants with altered expression of two putative signal transduction molecules, a light-specific soluble kinase and a plastid transmembrane protein, that appears to be regulated by a long noncoding natural antisense transcript, arising from the opposite strand, are physiologically incapable of photoacclimation. Based on these results, we propose a working model of the retrograde feedback in the signaling and regulation of photoacclimation in a marine diatom.
ISSN:0027-8424
1091-6490
DOI:10.1073/pnas.2216286120