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Published on April 9, 2008; 10.1104/pp.108.116194

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Received January 11, 2008
Accepted April 1, 2008

The PPR Protein DG1 is Involved in the Regulation of Early Chloroplast Development and Chloroplast Gene Expression in Arabidopsis thaliana

Wei Chi , Jinfang Ma , Dongyuan Zhang , Jinkui Guo , Fan Chen , Congming Lu , and Lixin Zhang *

Photosynthesis Research Center, Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; School of Life Sciences, Lanzhou University, Lanzhou 73000, China; Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100086, China (F. C)

* Corresponding author; email: zhanglixin{at}ibcas.ac.cn.

An Arabidopsis mutant that exhibited a delayed greening phenotype (dg1) was isolated from a population of activation-tagged Arabidopsis lines. Young, inner leaves of dg1 mutants were initially very pale, but gradually greened and mature, outer leaves, more than three-weeks old, appeared similar to those of wild-type plants. Sequence and transcription analyses showed that DG1 encodes a chloroplast protein consisting of eight pentratricopepite repeat (PPR) domains, and that its expression depends on both light and developmental status. In addition, analysis of the transcript profiles of chloroplast genes revealed that plastid-encoded polymerase (PEP)-dependent transcript levels were markedly reduced while nucleus-encoded polymerase (NEP)-dependent transcript levels were increased in dg1 mutants. Thus, DG1 is probably involved in the regulation of PEP-dependent chloroplast gene expression during early stages of chloroplast development.






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