Abstract
The Dutch elm disease (DED) pathogen Ophiostoma novo-ulmi Buissm. elicited the production of H2O2 in cell suspension cultures of the resistant species Ulmus pumila L. This response was not observed in suspensions of the susceptible elm U. campestris Mill. H2O2 production started after a lag time of 30-40 min following inoculation, peaked between 4 and 6 h and lasted up to 24 h. Treatment of the suspensions with exogenously added H2O2 did not cause accumulation of the sesquiterpene phytoalexins mansonones nor of the coumarin scopoletin. Spore germination and growth of O. novo-ulmi were significantly delayed with different amounts of H2O2 (0.1-1 mM). These results suggest that H2O2 production is an inducible defence response which may contribute to DED resistance by delaying the growth of the pathogen at the earliest stages of infection. Whether H2O2 is involved in other elm defence responses to the pathogen is presently unknown, but its production seems to be an independent event from phytoalexin formation.
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Claims 7
Claim · model-written summary
The pathogen elicited H2O2 production in resistant Ulmus pumila cell cultures.
- Taxon
- Ulmus pumila
Ulmus pumilae0 - Treatment
- Ophiostoma novo-ulmie0
- Interactor
- Ophiostoma novo-ulmiOphiostoma novo-ulmie0pathogen
- Outcome
- production of H2O2e0
- Direction
- elicitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The Dutch elm disease (DED) pathogen Ophiostoma novo-ulmi Buissm. elicited the production of H2O2 in cell suspension cultures of the resistant species Ulmus pumila L.”
Claim · model-written summary
Susceptible U. campestris cultures did not show that H2O2 response.
- Taxon
- U. campestris
.jpg?width=60)
Ulmus glabrae0 - Outcome
- This responsee0
- Direction
- not observede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“This response was not observed in suspensions of the susceptible elm U. campestris Mill.”
Claim · model-written summary
H2O2 production began 30-40 min after inoculation, peaked at 4-6 h, and persisted to 24 h.
- Taxon
- Ulmus pumilaUlmus pumilat0
- Outcome
- H2O2 productione0
- Value
- 30-40 mine0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 production started after a lag time of 30-40 min following inoculation, peaked between 4 and 6 h and lasted up to 24 h.”
t0“Ulmus pumila”
Claim · model-written summary
Added H2O2 did not accumulate mansonones or scopoletin.
- Taxon
- Ulmus pumilaUlmus pumilat0
- Treatment
- exogenously added H2O2e0
- Outcome
- accumulation of the sesquiterpene phytoalexins mansonones nor of the coumarin scopoletine0
- Direction
- did not causee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Treatment of the suspensions with exogenously added H2O2 did not cause accumulation of the sesquiterpene phytoalexins mansonones nor of the coumarin scopoletin.”
t0“Ulmus pumila”
Claim · model-written summary
H2O2 significantly delayed fungal spore germination and growth.
- Taxon
- O. novo-ulmiOphiostoma novo-ulmie0
- Treatment
- H2O2 (0.1-1 mM)e0
- Outcome
- Spore germination and growth of O. novo-ulmie0
- Direction
- delayede0
Not reportedComparator
Verbatim
e0“Spore germination and growth of O. novo-ulmi were significantly delayed with different amounts of H2O2 (0.1-1 mM).”
Claim · model-written summary
The authors suggest induced H2O2 production contributes to resistance by delaying early pathogen growth.
- Taxon
- Ulmus pumilaUlmus pumilat0
- Outcome
- DED resistancee0
- Qualifier
- delaying the growth of the pathogen at the earliest stages of infectione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“H2O2 production is an inducible defence response which may contribute to DED resistance by delaying the growth of the pathogen at the earliest stages of infection.”
t0“Ulmus pumila”
Claim · model-written summary
The authors interpret H2O2 production as independent of phytoalexin formation.
- Taxon
- Ulmus pumilaUlmus pumilat0
- Outcome
- phytoalexin formatione0
- Qualifier
- independent evente0
- Comparator
- its productione0
Not reportedCompoundOrgan / stageDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“its production seems to be an independent event from phytoalexin formation.”
t0“Ulmus pumila”