In vivo effects of NbSiR silencing on chloroplast development in Nicotiana benthamiana

In vivo effects of NbSiR silencing on chloroplast development in Nicotiana benthamiana Sulfite reductase (SiR) performs dual functions, acting as a sulfur assimilation enzyme and as a chloroplast (cp-) nucleoid binding protein. In this study, we examined the in vivo effects of SiR deficiency on chloroplast development in Nicotiana benthamiana. Virus-induced gene silencing of NbSiR resulted in leaf yellowing and growth retardation phenotypes, which were not rescued by cysteine supplementation. NbSiR:GFP fusion protein was targeted to chloroplasts and colocalized with cp-nucleoids. Recombinant full-length NbSiR protein and the C-terminal half of NbSiR possessed cp-DNA compaction activities in vitro, and expression of full-length NbSiR in E. coli caused condensation of genomic DNA. NbSiR silencing differentially affected expression of plastid-encoded genes, inhibiting expression of several genes more severely than others. In the later stages, depletion of NbSiR resulted in chloroplast ablation. In NbSiR-silenced plants, enlarged cp-nucleoids containing an increased amount of cp-DNA were observed in the middle of the abnormal chloroplasts, and the cp-DNAs were predominantly of subgenomic sizes based on pulse field gel electrophoresis. The abnormal chloroplasts developed prolamellar body-like cubic lipid structures in the light without accumulating NADPH:protochlorophyllide oxidoreductase proteins. Our results suggest that NbSiR plays a role in cp-nucleoid metabolism, plastid gene expression, and thylakoid membrane development. Plant Molecular Biology Springer Journals

In vivo effects of NbSiR silencing on chloroplast development in Nicotiana benthamiana

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Springer Netherlands
Copyright © 2010 by Springer Science+Business Media B.V.
Life Sciences; Plant Pathology; Biochemistry, general; Plant Sciences
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