期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 107, 期 42, 页码 18214-18219出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1007703107
关键词
diatoms; light acclimation; nonphotochemical quenching; RNA interference; ecotypes
资金
- JST-Centre National de la Recherche Scientifique (CNRS)
- Agence National de la Recherche (ANR)
- Human Frontier Science Program (HFSP) [0014/2006]
- FP7 Marie Curie Initial Training Network (ITN) [215174]
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.
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