Os08g0163400
The rice Os08g0163400 was reported as OsSIG1 in 2007 [1] by researchers from Japan.
Contents
Annotated Information
Gene Symbol
- Os08g0163400 <=> OsSIG1,SIG1
Function
- Sigma factors encoded by the nucleus of plants confer promoter specificity on the bacterial-type RNA polymerase in chloroplasts.
- OsSIG1 plays an important role in the maintenance of photosynthetic activity in mature chloroplasts of rice by regulating expression of chloroplast genes for components of photosystem I. [1]
Phenotypic analysis
- The OsSIG1 )/) plants were found to be fertile but they manifested an approximately one-third reduction in the chlorophyll content of mature leaves.
- Quantitative RT-PCR and northern blot analyses of chloroplast gene expression revealed that the abundance of transcripts derived from the psaA operon was markedly reduced in OsSIG1 )/) plants compared with that in wild-type homozygotes.
- This effect was accompanied by a reduction in the abundance of the core protein complex (PsaA–PsaB) of photosystem I. Analysis of chlorophyll fluorescence also revealed a substantial reduction in the rate of electron transfer from photosystem II to photosystem I in the OsSIG1 mutants.
Expression
- The transcripts of OsSIG1 accumulate relatively late during leaf development.[2]
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Labs working on this gene
- Cell-Free Science and Technology Research Center, Ehime University, Matsuyama 790-8577, Japan,
- Experimental Farm, Kyoto University, Takatsuki, Osaka 569-0096, Japan,
- The Venture Business Laboratory, Ehime University, Matsuyama 790-8577, Japan,
- Department of Integrated Biosciences, University of Tokyo, Kashiwa, Chiba 277-8562, Japan,
- Institute for Advanced Biosciences, Keio University, Tsuruoka, Yamagata 997-0017, Japan,
- National Institute of Agrobiological Sciences, Tsukuba 305-8602, Japan
References
- ↑ 1.0 1.1 Tozawa, Y, Masayoshi Teraishi., et al. (2007). "The plastid sigma factor SIG1 maintains photosystem I activity via regulated expression of the psaA operon in rice chloroplasts." The Plant Journal 52(1): 124-132.
- ↑ Kasai K , Kawagishi-Kobayashi M ., et al. (2004). "Differential expression of three plastidial sigma factors, OsSIG1, OsSIG2A, and OsSIG2B, during leaf development in rice.." Biosci Biotechnol Biochem 2004 Apr;68 (4):973-7.
