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Drought stress has a significant effect on the growth, physiology and biochemistry of medicinal plants.  SDIR1  ( Salt- and Drought-Induced Ring Finger1 ), a C 3 H 2 C 3 -type RING-finger E3 ubiquitin ligase gene plays an important role in the stress response of various plants. However, the role of this gene is not clear in  Coptis chinensis . In this study, the  CcSDIR1  gene was cloned from  C. chinensis  using RACE and RT-PCR. Sequence analysis revealed that  CcSDIR1  had an open reading frame of 840 bp that encodes 279 amino acids with a theoretical molecular weight about 31 kDa and  pI  value of 5.65 and shared conserved domains with other plants. On comparison with the wild-type plants, overexpression of  CcSDIR1  in transgenic tobaccos increased drought tolerance and showed better growth performance. However, lower malondialdehyde contents and high antioxidant enzyme activities were observed in transgenic tobacco plants compared to wild-type plants. In addition, Evans blue staining showed high cell viability of transgenic lines under drought stress. These results suggest that  CcSDIR1  regulates various responses to drought stress by increasing antioxidant enzyme activities and reducing oxidative damage. From the study results, the  CcSDIR1  gene will be very useful for drought stress research in plants.

Overexpression of a novel E3 ubiquitin ligase gene from Coptis chinensis Franch enhances drought tolerance in transgenic tobacco