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An atypical member of the light-harvesting complex stress-related protein family modulates diatom responses to light.

TitleAn atypical member of the light-harvesting complex stress-related protein family modulates diatom responses to light.
Publication TypeJournal Article
Year of Publication2010
AuthorsBailleul, B, Rogato, A, De Martino, A, Coesel, S, Cardol, P, Bowler, C, Falciatore, A, Finazzi, G
JournalProc Natl Acad Sci U S A
Volume107
Issue42
Pagination18214-9
Date Published2010 Oct 19
ISSN1091-6490
KeywordsChlorophyll, Diatoms, Gene Knockdown Techniques, Gene Silencing, Light, Light-Harvesting Protein Complexes, Oxygen
Abstract

Diatoms are prominent phytoplanktonic organisms that contribute around 40% of carbon assimilation in the oceans. They grow and perform optimally in variable environments, being able to cope with unpredictable changes in the amount and quality of light. The molecular mechanisms regulating diatom light responses are, however, still obscure. Using knockdown Phaeodactylum tricornutum transgenic lines, we reveal the key function of a member of the light-harvesting complex stress-related (LHCSR) protein family, denoted LHCX1, in modulation of excess light energy dissipation. In contrast to green algae, this gene is already maximally expressed in nonstressful light conditions and encodes a protein required for efficient light responses and growth. LHCX1 also influences natural variability in photoresponse, as evidenced in ecotypes isolated from different latitudes that display different LHCX1 protein levels. We conclude, therefore, that this gene plays a pivotal role in managing light responses in diatoms.

DOI10.1073/pnas.1007703107
Alternate JournalProc. Natl. Acad. Sci. U.S.A.
PubMed ID20921421
PubMed Central IDPMC2964204