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[Cloning and expression analysis of tocopherol cyclase gene in Carthamus tinctorius].

The tocopherol cyclase was one of the key enzymes in plant vitamin E biosynthesis pathway. According to the study of Carthamus tinctorius transcriptome data,the Tocopherol cyclase gene was obtained using RT-PCR techniques and named CtTC . Bioinformatics analysis showed theopen reading frame (ORF)of CtTC was 1 524 bp. The putative protein contained 507 amino acids with a predicted molecular mass of 62.9 kDa and theoretically isoelectric point was 5.01.Signal peptide analysis showed that it was a non secretory protein, and there was no signal peptide. The subcellular localization showed that the CtTC protein was located in the chloroplast. The expression of CtTC gene in safflower seeds at different development stages was determined by quantitative real-time PCR, it was found that the highest expression level of CtTC gene was detected in 50 DAF.Quantitative RT-PCR analysis suggested that expression of CtTC is induced and strengthened by drought stresses. This research provided a candidate gene for metabolic engineering of vitamin E and resisting stress.

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