Abstract
The application of silicon to the roots or leaves reduces the severity of powdery mildew ( Podosphaera xanthii ) in melon but the latter treatment is less effective. This study compared key biochemical defence responses of melon triggered by P. xanthii after root or foliar treatment with potassium silicate ( PS ). Treatments consisted of pathogen‐inoculated or mock‐inoculated plants supplied with PS via roots or foliarly, as well as a non‐treated control. The activity of defence enzymes and the concentration of phenolic compounds, lignin and malondialdehyde were determined from leaf samples at different time points after inoculation. Pathogen‐inoculated plants irrigated with PS showed both an accumulation of silicon and primed defence responses in leaves that were not observed in pathogen‐inoculated plants either sprayed with PS or not treated. These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase. Moreover, the lignin concentration increased in response to inoculation, whereas the malondialdehyde concentration decreased. For the foliar treatment, however, only an increase in lignin deposition was observed compared with the control plants. The results show that silicon strongly plays an active role in modulating the defence responses of melon against P. xanthii when supplied to the roots as opposed to the foliage.
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Claims 11
Claim · model-written summary
Root potassium silicate in pathogen-inoculated melon produced accumulation of silicon in leaves relative to foliar or untreated plants.
- Taxon
- melon
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Cucumis melot0 - Organ / stage
- leavese0
- Treatment
- irrigated with PSe0
- Interactor
- P. xanthiit1pathogen
- Outcome
- accumulation of silicone0
- Direction
- accumulatione0
- Comparator
- sprayed with PS or not treatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
.jpg?width=500)
Verbatim
e0“Pathogen‐inoculated plants irrigated with PS showed both an accumulation of silicon and primed defence responses in leaves that were not observed in pathogen‐inoculated plants either sprayed with PS or not treated.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root potassium silicate in pathogen-inoculated melon produced primed defence responses in leaves relative to foliar or untreated plants.
- Taxon
- melonCucumis melot0
- Organ / stage
- leavese0
- Treatment
- irrigated with PSe0
- Interactor
- P. xanthiit1pathogen
- Outcome
- primed defence responsese0
- Direction
- primede0
- Comparator
- sprayed with PS or not treatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pathogen‐inoculated plants irrigated with PS showed both an accumulation of silicon and primed defence responses in leaves that were not observed in pathogen‐inoculated plants either sprayed with PS or not treated.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root PS and pathogen inoculation altered melon activity of peroxidase.
- Taxon
- melonCucumis melot0
- Interactor
- P. xanthiit1pathogen
- Outcome
- activity of peroxidasee0
- Direction
- anticipatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root PS and pathogen inoculation altered melon accumulation of soluble phenols.
- Taxon
- melonCucumis melot0
- Interactor
- P. xanthiit1pathogen
- Outcome
- accumulation of soluble phenolse0
- Direction
- accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root PS and pathogen inoculation altered melon activation of chitinase.
- Taxon
- melonCucumis melot0
- Interactor
- P. xanthiit1pathogen
- Outcome
- activation of chitinasee0
- Direction
- activatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root PS and pathogen inoculation altered melon repression of catalase.
- Taxon
- melonCucumis melot0
- Interactor
- P. xanthiit1pathogen
- Outcome
- repression of catalasee0
- Direction
- repressione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root PS and pathogen inoculation altered melon activation of superoxide dismutase.
- Taxon
- melonCucumis melot0
- Interactor
- P. xanthiit1pathogen
- Outcome
- activation of superoxide dismutasee0
- Direction
- activatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Root PS and pathogen inoculation altered melon β‐ 1,3‐glucanase.
- Taxon
- melonCucumis melot0
- Interactor
- P. xanthiit1pathogen
- Outcome
- β‐ 1,3‐glucanasee0
- Direction
- activatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“These responses included the anticipated activity of peroxidase and accumulation of soluble phenols, the activation of chitinase and repression of catalase, and the stronger activation of superoxide dismutase, peroxidase and β‐ 1,3‐glucanase.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Pathogen inoculation increased melon lignin concentration.
- Taxon
- melonCucumis melot0
- Treatment
- inoculatione0
- Interactor
- P. xanthiit1pathogen
- Outcome
- lignin concentratione0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, the lignin concentration increased in response to inoculation, whereas the malondialdehyde concentration decreased.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Pathogen inoculation decreased melon malondialdehyde concentration.
- Taxon
- melonCucumis melot0
- Treatment
- inoculatione0
- Interactor
- P. xanthiit1pathogen
- Outcome
- malondialdehyde concentratione0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Moreover, the lignin concentration increased in response to inoculation, whereas the malondialdehyde concentration decreased.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
Claim · model-written summary
Foliar PS increased melon lignin deposition relative to controls.
- Taxon
- melonCucumis melot0
- Treatment
- foliar treatmente0
- Interactor
- P. xanthiit1pathogen
- Outcome
- lignin depositione0
- Direction
- increasee0
- Comparator
- control plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the foliar treatment, however, only an increase in lignin deposition was observed compared with the control plants.”
t0“melon”
t1“P. xanthii after root or foliar treatment with potassium silicate”
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See all 10 papers →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.