Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes.

@article{Kropat1997ChlorophyllPA,
  title={Chlorophyll precursors are signals of chloroplast origin involved in light induction of nuclear heat-shock genes.},
  author={Janette Kropat and Ulrike Oster and Wolfhart R{\"u}diger and Christoph F. Beck},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={1997},
  volume={94 25},
  pages={14168-72}
}
Coordination between the activities of organelles and the nucleus requires the exchange of signals. Using Chlamydomonas, we provide evidence that plastid-derived chlorophyll precursors may replace light in the induction of two nuclear heat-shock genes (HSP70A and HSP70B) and thus qualify as plastidic signal. Mutants defective in the synthesis of Mg-protoporphyrin IX were no longer inducible by light. Feeding of Mg-protoporphyrin IX or its dimethyl ester to wild-type or mutant cells in the dark… CONTINUE READING

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