title: Functional Characterization of the Tau Class Glutathione-S-Transferases Gene (SbGSTU) Promoter of Salicornia brachiata under Salinity and Osmotic Stress.
abstract: Reactive oxygen or nitrogen species are generated in the plant cell during the extreme stress condition, which produces toxic compounds after reacting with the organic molecules. The glutathione-S-transferase (GST) enzymes play a significant role to detoxify these toxins and help in excretion or sequestration of them. In the present study, we have cloned 1023 bp long promoter region of tau class GST from an extreme halophyte Salicornia brachiata and functionally characterized using the transgenic approach in tobacco. Computational analysis revealed the presence of abiotic stress responsive cis-elements like ABRE, MYB, MYC, GATA, GT1 etc., phytohormones, pathogen and wound responsive motifs. Three 5'-deletion constructs of 730 (GP2), 509 (GP3) and 348 bp (GP4) were made from 1023 (GP1) promoter fragment and used for tobacco transformation. The single event transgenic plants showed notable GUS reporter protein expression in the leaf tissues of control as well as treated plants. The expression level of the GUS gradually decreases from GP1 to GP4 in leaf tissues, whereas the highest level of expression was detected with the GP2 construct in root and stem under control condition. The GUS expression was found higher in leaves and stems of salinity or osmotic stress treated transgenic plants than that of the control plants, but, lower in roots. An efficient expression level of GUS in transgenic plants suggests that this promoter can be used for both constitutive as well as stress inducible expression of gene(s). And this property, make it as a potential candidate to be used as an alternative promoter for crop genetic engineering.
authors.affiliation: Division of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar (Gujarat), India.
authors.forename: Vivekanand
authors.initials: V
authors.lastname: Tiwari
authors.affiliation: Division of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar (Gujarat), India.
authors.forename: Manish Kumar
authors.initials: MK
authors.lastname: Patel
authors.affiliation: Division of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar (Gujarat), India.
authors.forename: Amit Kumar
authors.initials: AK
authors.lastname: Chaturvedi
authors.affiliation: Division of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar (Gujarat), India.
authors.forename: Avinash
authors.initials: A
authors.lastname: Mishra
authors.affiliation: Division of Marine Biotechnology and Ecology, CSIR-Central Salt and Marine Chemicals Research Institute, G. B. Marg, Bhavnagar (Gujarat), India.
authors.forename: Bhavanath
authors.initials: B
authors.lastname: Jha
mesh_terms: D001483:Base Sequence; D015139:Blotting, Southern; D019663:Chenopodiaceae / Q000187:drug effects / Q000201:enzymology / Q000235:genetics* / Q000502:physiology*; D003001:Cloning, Molecular; D003198:Computer Simulation; D005697:Galactosides / Q000378:metabolism; D017343:Genes, Plant; D005822:Genetic Vectors / Q000378:metabolism; D005966:Glucuronidase / Q000378:metabolism; D005982:Glutathione Transferase / Q000235:genetics*; D006923:Hymecromone / Q000031:analogs & derivatives / Q000378:metabolism; D008969:Molecular Sequence Data; D059372:Nucleotide Motifs / Q000235:genetics; D009997:Osmotic Pressure; D030821:Plants, Genetically Modified; D011401:Promoter Regions, Genetic; D054712:Salinity; D017384:Sequence Deletion; D012965:Sodium Chloride / Q000494:pharmacology; D013312:Stress, Physiological / Q000187:drug effects / Q000235:genetics*; D014026:Nicotiana / Q000235:genetics
chemical_list: D005697:Galactosides; D006923:Hymecromone; D012965:Sodium Chloride; C026845:4-methylumbelliferyl-galactopyranoside; D005982:Glutathione Transferase; D005966:Glucuronidase