title: Overexpression of phytoene synthase gene from Salicornia europaea alters response to reactive oxygen species under salt stress in transgenic Arabidopsis.
abstract: A phytoene synthase gene SePSY was isolated from euhalophyte Salicornia europaea L. The 1655 bp full-length SePSY has an open reading frame of 1257 bp and encodes a 419-amino acid protein. The overexpression of SePSY enhanced the growth of transgenic Arabidopsis. When the plants were exposed to 100 mM NaCl, the photosynthesis rate and photosystem II activity (Fv/Fm) increased from 92% to 132% and from 9.3% to 16.6% in the transgenic lines than in the wild-type, respectively. The transgenics displayed higher activities of SOD and POD and lower contents of H(2)O(2) and MDA than the WT. In conclusion, the transgenic lines showed higher tolerance to salt stress than WT plants by increased photosynthesis efficiency and antioxidative capacity. This is the first report about improving the salt tolerance by genetic manipulation of carotenoid biosynthesis.
authors.affiliation: Key Laboratory of Photosynthesis and Environmental Molecular Physiology, Institute of Botany, Chinese Academy of Sciences, 20 Nan Xin Cun, XiangShan, Beijing 100093, China.
authors.forename: Heping
authors.initials: H
authors.lastname: Han
authors.forename: Yinxin
authors.initials: Y
authors.lastname: Li
authors.forename: Shufeng
authors.initials: S
authors.lastname: Zhou
mesh_terms: D000222:Adaptation, Physiological / Q000187:drug effects*; D019883:Alkyl and Aryl Transferases / Q000737:chemistry / Q000378:metabolism*; D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000187:drug effects / Q000201:enzymology / Q000235:genetics*; D019663:Chenopodiaceae / Q000201:enzymology* / Q000235:genetics*; D017343:Genes, Plant; D051232:Geranylgeranyl-Diphosphate Geranylgeranyltransferase; D006861:Hydrogen Peroxide / Q000378:metabolism; D008315:Malondialdehyde / Q000378:metabolism; D008969:Molecular Sequence Data; D009195:Peroxidase / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D045332:Photosystem II Protein Complex / Q000378:metabolism; D030821:Plants, Genetically Modified; D017382:Reactive Oxygen Species / Q000378:metabolism*; D017422:Sequence Analysis, DNA; D012965:Sodium Chloride / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D045332:Photosystem II Protein Complex; D017382:Reactive Oxygen Species; D012965:Sodium Chloride; D008315:Malondialdehyde; D006861:Hydrogen Peroxide; D009195:Peroxidase; D013482:Superoxide Dismutase; D019883:Alkyl and Aryl Transferases; D051232:Geranylgeranyl-Diphosphate Geranylgeranyltransferase