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Plant Cell Advance Online Publication
Published on December 7, 2007; 10.1105/tpc.107.054312

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Received July 18, 2007
Returned for revision October 24, 2007
Accepted November 15, 2007

Plastid Signals Remodel Light Signaling Networks and Are Essential for Efficient Chloroplast Biogenesis in Arabidopsis

Michael E. Ruckle 1, Stephanie M. DeMarco 2, and Robert M. Larkin 1*

1 Michigan State University–Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824; Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824
2 Michigan State University–Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824

* To whom correspondence should be addressed. E-mail: larkinr{at}msu.edu.

Plastid signals are among the most potent regulators of genes that encode proteins active in photosynthesis. Plastid signals help coordinate the expression of the nuclear and chloroplast genomes and the expression of genes with the functional state of the chloroplast. Here, we report the isolation of new cryptochrome1 (cry1) alleles from a screen for Arabidopsis thaliana genomes uncoupled mutants, which have defects in plastid-to-nucleus signaling. We also report genetic experiments showing that a previously unidentified plastid signal converts multiple light signaling pathways that perceive distinct qualities of light from positive to negative regulators of some but not all photosynthesis-associated nuclear genes (PhANGs) and change the fluence rate response of PhANGs. At least part of this remodeling of light signaling networks involves converting HY5, a positive regulator of PhANGs, into a negative regulator of PhANGs. We also observed that mutants with defects in both plastid-to-nucleus and cry1 signaling exhibited severe chlorophyll deficiencies. These data show that the remodeling of light signaling networks by plastid signals is a mechanism that plants use to integrate signals describing the functional and developmental state of plastids with signals describing particular light environments when regulating PhANG expression and performing chloroplast biogenesis.




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