Efficient chloroplast transformation in Scoparia dulcis L. using pFaadAII vector
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The plastid transformation is used for high level expression of certain metabolically and industrially important recombinant proteins in plants. The vector, pFaadAII, a tobacco based vector system, harbouring a chimeric gene consisting of aadA coding region from Escherichia coli with 5′ 16S rDNA promoter and 3′ untranslated transcript region (UTR) of chlamydomonas rbcL gene, located in between the intergenic regions of rp132 and trnL genes. This vector used for transformation of plastids targets the foreign sequences to the small single-copy region of the plastome. Biolistic mode of approach for chloroplast transformation in Scoparia dulcis L., was achieved by bombarding the leaf explants and spectinomycin based selection system was used for regeneration of transformed plants. Transplastomic lines have been successfully established with overall efficiency of two transgenic lines for twenty-five bombarded explants. Integration of aadA in selection based regenerants was characterized by PCR and protein accumulation analysis along with seedlings experiment obtained from selfing. The chloroplast transformation developed in this plant system will provide scope for research in plastid based metabolic engineering pathways.
KeywordsChloroplast transformation Heterologous vector Transplastomic plants aadA
The authors would like to thank H. U. Koop, Germany, for useful suggestions and providing pFaadAII plastid vector used in this study. We greatly acknowledge the financial assistance provided by the Department of Science and Technology-New Delhi (SR/SO/BB011/2010, SERB), Department of Science and Technology-INSPIRE (DST/INSPIRE Fellowship/2011/426). AS is grateful to UGC for BSR-Faculty Fellowship. The authors are also thankful to UGC, New Delhi for financial support under SAP-DRS phase-II to the Department of Biotechnology, Kakatiya University.
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Conflict of interest
The authors declare that they have no conflict of interest.
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