Clones of FeSOD, MDHAR, DHAR Genes from White Clover and Gene Expression Analysis of ROS-Scavenging Enzymes during Abiotic Stress and Hormone TreatmentsReport as inadecuate




Clones of FeSOD, MDHAR, DHAR Genes from White Clover and Gene Expression Analysis of ROS-Scavenging Enzymes during Abiotic Stress and Hormone Treatments - Download this document for free, or read online. Document in PDF available to download.

College of Animal Science and Technology, Sichuan Agricultural University, Chengdu 611130, China





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Academic Editor: Derek J. McPhee

Abstract Increased transcriptional levels of genes encoding antioxidant enzymes play important protective roles in coping with excessive accumulation of reactive oxygen species ROS in plants exposed to various abiotic stresses. To fully elucidate different evolutions and functions of ROS-scavenging enzymatic genes, we isolated iron superoxide dismutase FeSOD, dehydroascorbate reductase DHAR and monodehydroascorbate reductase MDHAR from white clover for the first time and subsequently tested dynamic expression profiles of these genes together with previously identified other antioxidant enzyme genes including copper zinc superoxide dismutase Cu-ZnSOD, manganese superoxide dismutase MnSOD, glutathione reductase GR, peroxidase POD, catalase CAT, and ascorbate peroxidase APX in response to cold, drought, salinity, cadmium stress and exogenous abscisic acid ABA or spermidine Spd treatment. The cloned fragments of FeSOD, DHAR and MDHAR genes were 630, 471 and 669 bp nucleotide sequences encoding 210, 157 and 223 amino acids, respectively. Phylogenetic analysis indicated that both amino acid and nucleotide sequences of these three genes are highly conservative. In addition, the analysis of genes expression showed the transcription of GR, POD, MDHAR, DHAR and Cu-ZnSOD were rapidly activated with relatively high abundance during cold stress. Differently, CAT, APX, FeSOD, Cu-ZnSOD and MnSOD exhibited more abundant transcripts compared to others under drought stress. Under salt stress, CAT was induced preferentially 3–12 h compared to GR which was induced later 12–72 h. Cadmium stress mainly up-regulated Cu-ZnSOD, DHAR and MDHAR. Interestingly, most of genes expression induced by ABA or Spd happened prior to various abiotic stresses. The particular expression patterns and different response time of these genes indicated that white clover differentially activates genes encoding antioxidant enzymes to mitigate the damage of ROS during various environmental stresses. View Full-Text

Keywords: white clover Trifolium repens L.; ROS-scavenging; expression analysis; abiotic stress white clover Trifolium repens L.; ROS-scavenging; expression analysis; abiotic stress





Author: Yan Zhang, Zhou Li, Yan Peng * , Xiaojuan Wang, Dandan Peng, Yaping Li, Xiaoshuang He, Xinquan Zhang * , Xiao Ma, Linkai Huang and Yanhong Yan

Source: http://mdpi.com/



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