title: Characterization of copper/zinc and manganese superoxide dismutase in green bamboo (Bambusa oldhamii): Cloning, expression and regulation.
abstract: Bamboo is distinguished by its rapid growth, for growth more than 100 cm per day. Because of the rapid growth, tissues have significant ATP requirements, which results in intense reduction of oxygen and thus oxidative stress. For this reason, bamboo may have a special and efficient scavenger system to release the stress during fast cell division and elongation. Here, we investigated superoxide dismutase (SOD, E.C.1.15.1.1), the first line of antioxidant enzymes, in green bamboo (Bambusa oldhamii). The SOD activity profile in this species was complex, with 5 genes and 7 isozymes of CuZnSOD and 4 genes and 1 isozyme of MnSOD. We isolated one of each of the green bamboo CuZnSOD and MnSOD genes, and their activities were stable under a broad range of pH and temperature treatments, even at room temperature for more than 3 days. Bamboo SODs showed developmental and tissue-specific regulation, and both transcript and protein levels were responsive to abscisic acid, UV-B and high-light treatments. The complexity of the cis-elements in promoter regions implied that the regulation mechanisms of SOD might help accomplish the unique fast-growth phenotype of green bamboo.
authors.affiliation: Institute of Plant Biology, National Taiwan University, Taipei 10617, Taiwan.
authors.forename: Tsung-Han
authors.initials: TH
authors.lastname: Wu
authors.forename: Ming-Huei
authors.initials: MH
authors.lastname: Liao
authors.forename: Wen-Yu
authors.initials: WY
authors.lastname: Kuo
authors.forename: Chien-Hsun
authors.initials: CH
authors.lastname: Huang
authors.forename: Hsu-Liang
authors.initials: HL
authors.lastname: Hsieh
authors.forename: Tsung-Luo
authors.initials: TL
authors.lastname: Jinn
mesh_terms: D001205:Ascorbic Acid / Q000494:pharmacology; D031723:Bambusa / Q000187:drug effects / Q000201:enzymology* / Q000528:radiation effects; D057075:Enzyme Assays; D008027:Light; D010940:Plant Proteins / Q000378:metabolism*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013482:Superoxide Dismutase / Q000378:metabolism*; D014466:Ultraviolet Rays
chemical_list: D010940:Plant Proteins; D013482:Superoxide Dismutase; D001205:Ascorbic Acid