OPEN ACCESS ARTICLE

This Article Free via Open Access: OA OA Full Text Full Text (PDF) Supplemental Data OA All Versions of this Article: 19/12/3944    most recent tpc.107.054312v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by Ruckle, M. E. Articles by Larkin, R. M. Search for Related Content PubMed PubMed Citation Articles by Ruckle, M. E. Articles by Larkin, R. M. Agricola Articles by Ruckle, M. E. Articles by Larkin, R. M.

Plastid Signals Remodel Light Signaling Networks and Are Essential for Efficient Chloroplast Biogenesis in Arabidopsis^[W],[OA]

^a Michigan State University–Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, Michigan 48824
^b Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, Michigan 48824

¹ Address correspondence to 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.

This article has been cited by other articles:

				E. Giraud, L. H.M. Ho, R. Clifton, A. Carroll, G. Estavillo, Y.-F. Tan, K. A. Howell, A. Ivanova, B. J. Pogson, A. H. Millar, et al. The Absence of ALTERNATIVE OXIDASE1a in Arabidopsis Results in Acute Sensitivity to Combined Light and Drought Stress Plant Physiology, June 1, 2008; 147(2): 595 - 610. [Abstract] [Full Text] [PDF]

				E. L. Martin-Tryon and S. L. Harmer XAP5 CIRCADIAN TIMEKEEPER Coordinates Light Signals for Proper Timing of Photomorphogenesis and the Circadian Clock in Arabidopsis PLANT CELL, May 1, 2008; 20(5): 1244 - 1259. [Abstract] [Full Text] [PDF]