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Abiotic and biotic stresses widely reduce light harvesting complex ( LHC ) gene expression in higher plants and algae. However, control mechanisms and functions of these changes are not well understood. During herbivory, marine diatom species release oxylipins that impair grazer reproduction and serve as signaling molecules to nearby undamaged diatoms. To examine  LHC  mRNA regulation by oxylipin exposure, the diatom  Phaeodactylum tricornutum  was treated with a sublethal concentration of  trans , trans -2,4-decadienal (DD) during the light cycle. Transcriptome analyses revealed extensive suppression of  LHC  mRNAs and a smaller set of up-regulated  LHC  mRNAs at 3 h. For two divergently regulated  LHCF  antennae family mRNAs,  in vivo  4-thiouracil metabolic labeling was used to distinguish synthesis and degradation rates. Within 3 h of DD exposure,  Lhcf2  mRNA levels and transcription were strongly suppressed and its mRNA half-life decreased. In contrast,  Lhcf15  mRNA mainly accumulated between 3–9 h, its transcription increased and its mRNA was highly stabilized. Hence, DD-treated cells utilized transcriptional and mRNA stability control mechanisms which were likely major factors in the differing  Lhcf2  and  Lhcf15  expression patterns. Widespread  LHC  mRNA regulation and possible effects on photosynthesis may contribute to enhanced fitness in cells impacted by herbivory and other stresses.

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Early dynamics of photosynthetic Lhcf2 and Lhcf15 transcription and mRNA stabilities in response to herbivory-related decadienal in Phaeodactylum tricornutum