[en] 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.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Bailleul, Benjamin
Rogato, Alessandra
de Martino, Alessandra
Coesel, Sacha
Cardol, Pierre ; Université de Liège - ULiège > Département des sciences de la vie > Génétique
Bowler, Chris
Falciatore, Angela
Finazzi, Giovanni
Language :
English
Title :
An atypical member of the light-harvesting complex stress-related protein family modulates diatom responses to light.
Publication date :
2010
Journal title :
Proceedings of the National Academy of Sciences of the United States of America
ISSN :
0027-8424
eISSN :
1091-6490
Publisher :
National Academy of Sciences, Washington, United States - District of Columbia
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