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New Arabidopsis cue Mutants Suggest a Close Connection between Plastid- and Phytochrome Regulation of Nuclear Gene Expression1

Enrique López-Juez, R. Paul Jarvis, Atsuko Takeuchi, Anton M. Page, and Joanne Chory*

Plant Biology Laboratory (E.L.-J., R.P.J., A.T., J.C.), and Howard Hughes Medical Institute (J.C.), The Salk Institute, 10010 North Torrey Pines Road, La Jolla, California 92037; and The Salk Institute, 10010 North Torrey Pines Road, La Jolla, California 92037School of Biological Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, United Kingdom (E.L.-J., A.M.P.)

We searched for new components that are involved in the positive regulation of nuclear gene expression by light by extending a screen for Arabidopsis cue (chlorophyll a/b-binding [CAB] protein-underexpressed) mutants (H.-M. Li, K. Culligan, R.A. Dixon, J. Chory [1995] Plant Cell 7: 1599-1610). cue mutants display reduced expression of the CAB3 gene, which encodes light-harvesting chlorophyll protein, the main chloroplast antenna. The new mutants can be divided into (a) phytochrome-deficient mutants (hy1 and phyB), (b) virescent or delayed-greening mutants (cue3, cue6, and cue8), and (c) uniformly pale mutants (cue4 and cue9). For each of the mutants, the reduction in CAB expression correlates with the visible phenotype, defective chloroplast development, and reduced abundance of the light-harvesting chlorophyll protein. Levels of protochlorophyllide oxidoreductase (POR) were reduced to varying degrees in etiolated mutant seedlings. In the dark, whereas the virescent mutants displayed reduced CAB expression and the lowest levels of POR protein, the other mutants expressed CAB and accumulated POR at near wild-type levels. All of the mutants, with the exception of cue6, were compromised in their ability to derepress CAB expression in response to phytochrome activation. Based on these results, we propose that the previously postulated plastid-derived signal is closely involved in the pathway through which phytochrome regulates the expression of nuclear genes encoding plastid proteins.

1   This work was supported by a grant from the U.S. Department of Energy (no. ER13993 to J.C.). While at The Salk Institute, E.L.-J. was a fellow of the Spanish Ministry of Education and of the North Atlantic Treaty Organization. R.P.J. is a long-term fellow of the International Human Frontier Science Program Organization. J.C. is an associate investigator at the Howard Hughes Medical Institute.
*   Corresponding author; e-mail chory{at}salk.edu; fax 1-619-558-6379.

Plant Physiol. (1998) 118: 803-815
Copyright Clearance Center:   0032-0889/98/118//13
© 1998 American Society of Plant Physiologists




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