title: Extremely high boron tolerance in Puccinellia distans (Jacq.) Parl. related to root boron exclusion and a well-regulated antioxidant system.
abstract: Recent studies indicate an extremely high level of tolerance to boron (B) toxicity in Puccinellia distans (Jacq.) Parl. but the mechanistic basis is not known. Puccinellia distans was exposed to B concentrations of up to 1000 mg B L-1 and root B uptake, growth parameters, B and N contents, H2O2 accumulation and ·OH-scavenging activity were measured. Antioxidant enzyme activities including superoxide dismutase (SOD), ascorbate peroxidase, catalase, peroxidase and glutathione reductase, and lipid peroxidation products were determined. B appears to be actively excluded from roots. Excess B supply caused structural deformations in roots and leaves, H2O2 accumulation and simultaneous up-regulation of the antioxidative system, which prevented lipid peroxidation even at the highest B concentrations. Thus, P. distans has an efficient root B-exclusion capability and, in addition, B tolerance in shoots is achieved by a well-regulated antioxidant defense system.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Hamurcu
authors.forename: Erdogan E
authors.initials: EE
authors.lastname: Hakki
authors.forename: Tijen
authors.initials: T
authors.lastname: Demiral Sert
authors.forename: Canan
authors.initials: C
authors.lastname: Özdemir
authors.forename: Ersin
authors.initials: E
authors.lastname: Minareci
authors.forename: Zuhal Z
authors.initials: ZZ
authors.lastname: Avsaroglu
authors.forename: Sait
authors.initials: S
authors.lastname: Gezgin
authors.forename: Seyit
authors.initials: S
authors.lastname: Ali Kayis
authors.forename: Richard W
authors.initials: RW
authors.lastname: Bell
mesh_terms: D000222:Adaptation, Physiological; D000975:Antioxidants / Q000378:metabolism; D060387:Ascorbate Peroxidases / Q000378:metabolism; D001692:Biological Transport; D001895:Boron / Q000378:metabolism*; D002374:Catalase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D006861:Hydrogen Peroxide / Q000378:metabolism; D015227:Lipid Peroxidation; D009584:Nitrogen / Q000378:metabolism; D009195:Peroxidase / Q000378:metabolism; D018515:Plant Leaves / Q000378:metabolism / Q000502:physiology*; D018517:Plant Roots / Q000378:metabolism / Q000502:physiology*; D018520:Plant Shoots / Q000378:metabolism / Q000502:physiology*; D006109:Poaceae / Q000378:metabolism / Q000502:physiology*; D017382:Reactive Oxygen Species / Q000378:metabolism; D012987:Soil / Q000737:chemistry; D013482:Superoxide Dismutase / Q000378:metabolism; D013997:Time Factors
chemical_list: D000975:Antioxidants; D017382:Reactive Oxygen Species; D012987:Soil; D006861:Hydrogen Peroxide; D060387:Ascorbate Peroxidases; D002374:Catalase; D009195:Peroxidase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase; D009584:Nitrogen; D001895:Boron