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Mol Gen Genet. 1998 May;258(4):342-51.

The PAC protein affects the maturation of specific chloroplast mRNAs in Arabidopsis thaliana.

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Institut für Entwicklungs- und Molekularbiologie der Pflanzen, Heinrich-Heine-Universität, Düsseldorf, Germany.


The pale cress (pac) mutation arrests chloroplast development at an early stage in Arabidopsis thaliana and leads to a white phenotype. Chlorophyll fluorescence measurements demonstrated that the photosynthetic apparatus was impaired. The mutation did not reduce transcription of nuclear genes with photosynthetic function. However, distinct chloroplast-encoded transcripts were affected. The mutation mainly changed the maturation pattern, but the abundance of specific transcripts was also reduced. The defects observed imply a specific role for PAC in chloroplast mRNA maturation. PAC is encoded by a nuclear gene and is transported into the chloroplast. Therefore PAC may be one of the nucleus-encoded factors that function in plastid mRNA maturation and accumulation.

[Indexed for MEDLINE]

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