title: The expression of manganese superoxide dismutase gene from Nelumbo nucifera responds strongly to chilling and oxidative stresses.
abstract: A manganese superoxide dismutase (Mn-SOD) gene, NnMSD1, was identified from embryonic axes of the sacred lotus (Nelumbo nucifera Gaertn.). The NnMSD1 protein contains all conserved residues of the Mn-SOD protein family, including four consensus metal binding domains and a signal peptide for mitochondrial targeting. Southern blot analysis suggests the existence of two Mn-SOD genes in sacred lotus. NnMSD1 was highly expressed in developing embryonic axes during seed development, but appeared in cotyledons only at the early stage of development and became undetectable in the cotyledons during late embryogenesis. The expression of the NnMSD1 gene in germinating embryonic axes, in response to various stresses such as heat shock, chilling, and exposure to stress-related chemicals, was also studied. Heat shock strongly inhibited the expression of the NnMSD1 gene, whereas the NnMSD1 transcript level increased strongly in chilling stress treatment. An increase in expression was also highly induced by H2O2 in germinating embryonic axes. The results suggest that the expression pattern of the NnMSD1 gene differed between developing axes and cotyledons, and that the NnMSD1 gene expression responds strongly to chilling and oxidative stress.
authors.affiliation: School of Life Sciences, Sun Yat-sen University, Guangzhou 510275, China.
authors.forename: Wen
authors.initials: W
authors.lastname: Li
authors.forename: Lin
authors.initials: L
authors.lastname: Qi
authors.forename: Xiaodong
authors.initials: X
authors.lastname: Lin
authors.forename: Huhui
authors.initials: H
authors.lastname: Chen
authors.forename: Zhanqi
authors.initials: Z
authors.lastname: Ma
authors.forename: Keqiang
authors.initials: K
authors.lastname: Wu
authors.forename: Shangzhi
authors.initials: S
authors.lastname: Huang
mesh_terms: D000595:Amino Acid Sequence; D001483:Base Sequence; D015139:Blotting, Southern; D003080:Cold Temperature; D017124:Conserved Sequence; D018744:DNA, Plant / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic; D018506:Gene Expression Regulation, Plant; D018745:Genome, Plant / Q000235:genetics; D018525:Germination / Q000235:genetics; D007438:Introns / Q000235:genetics; D008969:Molecular Sequence Data; D031653:Nelumbo / Q000201:enzymology* / Q000235:genetics*; D018384:Oxidative Stress / Q000235:genetics; D010802:Phylogeny; D018515:Plant Leaves / Q000201:enzymology / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012639:Seeds / Q000196:embryology / Q000235:genetics; D016415:Sequence Alignment; D020539:Sequence Analysis, Protein; D013045:Species Specificity; D013312:Stress, Physiological / Q000235:genetics*; D013482:Superoxide Dismutase / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism
chemical_list: D018744:DNA, Plant; D013482:Superoxide Dismutase