title: Role of hydrogen peroxide during the interaction between the hemibiotrophic fungal pathogen Septoria tritici and wheat.
abstract: Hydrogen peroxide (H(2)O(2)) is reported to inhibit biotrophic but benefit necrotrophic pathogens. Infection by necrotrophs can result in a massive accumulation of H(2)O(2) in hosts. Little is known of how pathogens with both growth types are affected (hemibiotrophs). The hemibiotroph, Septoria tritici, infecting wheat (Triticum aestivum) is inhibited by H(2)O(2) during the biotrophic phase, but a large H(2)O(2) accumulation occurs in the host during reproduction. Here, we infiltrated catalase, H(2)O(2) or water into wheat during the biotrophic or the necrotrophic phase of S. tritici and studied the effect of infection on host physiology to get an understanding of the survival strategy of the pathogen. H(2)O(2) removal by catalase at both early and late stages made plants more susceptible, whereas H(2)O(2) made them more resistant. H(2)O(2) is harmful to S. tritici throughout its life cycle, but it can be tolerated. The late accumulation of H(2)O(2) is unlikely to result from down-regulation of photosynthesis, but probably originates from damage to the peroxisomes during the general tissue collapse, which is accompanied by release of soluble sugars in a susceptible cultivar.
authors: University of Copenhagen, Faculty of Life Sciences, Department of Plant Biology, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
authors: Nandini P
authors: NP
authors: Shetty
authors: Plant Research International, Wageningen University and Research Centre, PO Box 16, 6700 AA Wageningen, the Netherlands.
authors: Rahim
authors: R
authors: Mehrabi
authors: University of Copenhagen, Faculty of Life Sciences, Department of Plant Biology, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
authors: Henrik
authors: H
authors: Lütken
authors: University of Copenhagen, Faculty of Life Sciences, Department of Plant Biology, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
authors: Anna
authors: A
authors: Haldrup
authors: Plant Research International, Wageningen University and Research Centre, PO Box 16, 6700 AA Wageningen, the Netherlands.
authors: Gert H J
authors: GHJ
authors: Kema
authors: University of Copenhagen, Faculty of Life Sciences, Department of Plant Biology, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
authors: David B
authors: DB
authors: Collinge
authors: University of Copenhagen, Faculty of Life Sciences, Department of Plant Biology, Thorvaldsensvej 40, DK-1871 Frederiksberg C, Denmark.
authors: Hans Jørgen Lyngs
authors: HJL
authors: Jørgensen
mesh_terms: D001203:Ascomycota / Q000235:genetics / Q000378:metabolism*; D002241:Carbohydrates / Q000032:analysis; D002374:Catalase / Q000378:metabolism; D002734:Chlorophyll / Q000032:analysis; D004271:DNA, Fungal; D018506:Gene Expression Regulation, Plant; D006861:Hydrogen Peroxide / Q000378:metabolism*; D010788:Photosynthesis; D010935:Plant Diseases / Q000382:microbiology*; D018515:Plant Leaves / Q000737:chemistry / Q000378:metabolism; D014908:Triticum / Q000737:chemistry / Q000378:metabolism / Q000382:microbiology*
chemical_list: D002241:Carbohydrates; D004271:DNA, Fungal; D002734:Chlorophyll; D006861:Hydrogen Peroxide; D002374:Catalase