期刊
PHOTOSYNTHESIS RESEARCH
卷 147, 期 2, 页码 131-143出版社
SPRINGER
DOI: 10.1007/s11120-020-00793-0
关键词
PPR; Sigma factor; PEP; Light; Chloroplast development
资金
- National Key Research and Development Program of China [2016YFD0100405]
- Ministry of Agriculture of China [2016ZX08009-003]
This study revealed that a mutation in the DUA1 gene in rice led to deficient chloroplast development, impaired chlorophyll biosynthesis, and reduced expression of PEP-dependent genes under low-temperature and low-light conditions. Additionally, the interaction between DUA1 and OsSIG1 was shown to play a crucial role in regulating chloroplast gene expression and modulating chloroplast development in response to environmental signals.
Chloroplast gene expression is controlled by both plastid-encoded RNA polymerase (PEP) and nuclear-encoded RNA polymerase and is crucial for chloroplast development and photosynthesis. Environmental factors such as light and temperature can influence transcription in chloroplasts. In this study, we showed that mutation in DUA1, which encodes a pentatricopeptide repeat (PPR) protein in rice (Oryza sativa), led to deficiency in chloroplast development and chlorophyll biosynthesis, impaired photosystems, and reduced expression of PEP-dependent transcripts at low temperature especially under low-light conditions. Furthermore, we demonstrated that sigma factor OsSIG1 interacted with DUA1 in vitro and in vivo. Moreover, the levels of chlorophyll and PEP-dependent gene expression were significantly decreased in the Ossig1 mutants at low-temperature and low-light conditions. Our study reveals that the PPR protein DUA1 plays an important role in regulating PEP-mediated chloroplast gene expression through interacting with OsSIG1, thus modulates chloroplast development in response to environmental signals.
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