Abstract: Cyclophilins (CyPs) are widely distributed in organisms, and play important roles. Cyclophilin A-like was screened in our study from Chlorella sp. cDNA library. By extracting Arabidopsis thaliana protoplasts that was transformed the 35S::CyPA::GFP fusion plasmid, it showed that CyPA located in the chloroplasts. Overexpression of CyPA gene in yeast enhanced the InV yeast growth ability to resistance of NaCl, NaHCO₃ and drought stress. Real-time quantitative PCR showed that under abiotic stress conditions, CyPA gene expression quantity increased. So we speculated that CyPA genes were associated with abiotic stress resistance, through the cyclophilin A involved in improving survival ability of resistant organisms.

Key words: chlorella, cyclophilins, real time quantitative PCR, expression pattern of gene