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The heat shock transcription factor (Hsf) family, an important member in plant stress response, affects cadmium (Cd) tolerance in plants. In this study, we identified and functionally characterized a transcript of the Hsf A4 subgroup from  Sedum alfredii . Designated as  SaHsfA4c , the open reading frame was 1,302 bp long and encoded a putative protein of 433 amino acids containing a complete DNA-binding domain (DBD). Heterologous expression of  SaHsfA4c  in yeast enhanced Cd stress tolerance and accumulation, whereas expression of the alternatively spliced transcript  InSaHsfA4c  which contained an intron and harbored an incomplete DBD, resulted in relatively poor Cd stress tolerance and low Cd accumulation in transgenic yeast. The function of  SaHsfA4c  under Cd stress was characterized in transgenic  Arabidopsis  and non-hyperaccumulation ecotype  S. alfredii .  SaHsfA4c  was able to rescue the Cd sensitivity of the  Arabidopsis athsfa4c  mutant.  SaHsfA4c  reduced reactive oxygen species (ROS) accumulation and increased the expression of ROS-scavenging enzyme genes and  Hsps  in transgenic lines. The present results suggest that  SaHsfA4c  increases plant resistance to stress by up-regulating the activities of ROS-scavenging enzyme and the expression of  Hsps .

SaHsfA4c From Sedum alfredii Hance Enhances Cadmium Tolerance by Regulating ROS-Scavenger Activities and Heat Shock Proteins Expression