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Role of hydrogen peroxide during the interaction between the hemibiotrophic fungal pathogen Septoria tritici and wheat
Author(s) -
Shetty Nandini P.,
Mehrabi Rahim,
Lütken Henrik,
Haldrup Anna,
Kema Gert H. J.,
Collinge David B.,
Jørgensen Hans Jørgen Lyngs
Publication year - 2007
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.2007.02026.x
Subject(s) - septoria , catalase , hydrogen peroxide , biology , pathogen , hypha , host (biology) , botany , appressorium , photosynthesis , microbiology and biotechnology , biochemistry , enzyme , ecology
Summary• 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.