文献类型：期刊文献

英文题名：Identification, expression analysis of the Hsf family, and characterization of class A4 in Sedum alfredii hance under cadmium stress

作者：Chen S.-S. Jiang J. Han X.-J. Zhang Y.-X. Zhuo R.-Y.

第一作者：Chen S.-S.

机构：[1]State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry, Beijing, 100091, China;[2]Key Laboratory of Tree Breeding of Zhejiang Province, Research Institute of Subtropical of Forestry, Chinese Academy of Forestry, Hangzhou, 311400, China

年份：2018

卷号：19

期号：4

外文期刊名：International Journal of Molecular Sciences

收录：Scopus(收录号：2-s2.0-85045888229)

语种：英文

外文关键词：Cadmium stress; Class A4; Heat shock transcription factor (Hsf); Sedum alfredii hance

摘要：Sedum alfredii Hance, a cadmium (Cd)/zinc (Zn)/lead (Pb) co-hyperaccumulating species, is a promising phytoremediation candidate because it accumulates substantial amounts of heavy metal ions without showing any obvious signs of poisoning. The heat shock transcription factor (Hsf) family plays crucial roles in plant growth, development, and stress responses. Although the roles of some Hsfs in abiotic stress have been well studied in model plants, the Hsf family has not been systematically investigated in heavy metal hyperaccumulators. Here, we comprehensively analyzed the Hsf gene family in S. alfredii based on a transcriptome under Cd stress. There were 22 Hsf members that were identified and phylogenetically clustered into three classes, namely, SaHsfA, SaHsfB, and SaHsfC. All of the three classes shared similar motifs. The expression profiles of the 22 Hsf members showed significant differences: 18 SaHsfs were responsive to Cd stress, as were multiple SaHsp genes, including SaHsp18.1, SaHsp22, SaHsp26.5, SaHsp70, SaHsp90, and SaHsp101. Two class A4 members, SaHsfA4a and SaHsfA4c, exhibited transcriptional activation activities. Overexpression of SaHsfA4a and SaHsfA4c in transgenic yeast indicated an improved tolerance to Cd stress and Cd accumulation. Our results suggest SaHsfs play important regulatory roles in heavy metal stress responses, and provide a reference for further studies on the mechanism of heavy metal stress regulation by SaHsfs. ? 2018 by the authors. Licensee MDPI, Basel, Switzerland.