Abstract
Abstract The effects of systemic fungicides on the host‐pathogen interface between barley and powdery mildew were studied using cytological methods and specific staining procedures. Propiconazole, etaconazole, bitertanol, triforine, imazalil, nuarimol, tridemorph and fenpropimorph, which are all inhibitors of sterol biosynthesis, stopped growth of the fungus 2 days after application and led to deposits of plant origin around haustoria; these contained polysaccharides, especially callose. This encapsulation resembled the reaction often observed in resistant plants. In contrast, pyrazophos and ethirimol, applied at reduced concentrations, inhibited the fungus at the haustorial stage but did not induce encapsulation. These results suggest that encapsulation is not simply a reaction to the previously damaged fungus, but may be an indirect effect of sterol biosynthesis‐inhibiting fungicides on the host metabolism which is elicited by the fungus. The results are discussed in the context of previous observations on the modes of action of these fungicides.
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Claims 3
Claim · model-written summary
Sterol biosynthesis inhibitors stopped powdery mildew growth two days after application.
- Taxon
- barley
.jpg?width=60)
Hordeum vulgaret0 - Treatment
- Propiconazole, etaconazole, bitertanol, triforine, imazalil, nuarimol, tridemorph and fenpropimorphe0
- Interactor
- powdery mildewt0pathogen
- Outcome
- growth of the funguse0
- Direction
- stoppede0
- Value
- 2 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Propiconazole, etaconazole, bitertanol, triforine, imazalil, nuarimol, tridemorph and fenpropimorph, which are all inhibitors of sterol biosynthesis, stopped growth of the fungus 2 days after application”
t0“barley‐powdery mildew”
Claim · model-written summary
Sterol biosynthesis inhibitors produced plant deposits around powdery mildew haustoria containing polysaccharides, especially callose.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- sterol biosynthesise1
- Interactor
- powdery mildewt0pathogen
- Outcome
- deposits of plant origin around haustoriae0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“led to deposits of plant origin around haustoria; these contained polysaccharides, especially callose”
e1“inhibitors of sterol biosynthesis”
t0“barley‐powdery mildew (Erysiphe graminis f. sp. hordei marchal)”
Claim · model-written summary
Pyrazophos and ethirimol at reduced concentrations inhibited powdery mildew at the haustorial stage without encapsulation.
- Taxon
- barleyHordeum vulgaret0
- Treatment
- pyrazophos and ethirimole0
- Interactor
- powdery mildewt0pathogen
- Outcome
- fungus at the haustorial stagee0
- Direction
- inhibitede0
- Qualifier
- did not induce encapsulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pyrazophos and ethirimol, applied at reduced concentrations, inhibited the fungus at the haustorial stage but did not induce encapsulation”
t0“barley‐powdery mildew”
The same questions in other papers
enilconazole · growth · Hordeum vulgare (barley)Positive and negative results
2 papers in the same direction as this paper · 1 in the opposite direction
- negative
- positive
- positive
nuarimol · growth · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- positive
propiconazole · growth · Hordeum vulgare (barley)Results agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.