Abstract
Coffee leaf rust, caused by the fungus Hemileia vastatrix, is considered the main disease of coffee in Brazil. Aiming to find alternatives to control this disease, this study investigated, at the metabolic level, the possible effect of silicon (Si) on coffee resistance to coffee leaf rust. The analytical pyrolysis was used to evaluate possible changes in the chemical composition of lignin on the leaves of coffee plants supplied with Si and inoculated with H. vastatrix. There was no significant increase in the foliar Si concentration for plants supplied with this element, consequently, there was no reduction on coffee leaf rust symptoms. Eight compounds derived from lignin from the p-hidroxifenila precursor (H) were identified, seven from the precursor guaiacyl (G) and one from the precursor syringyl (S) on leaves of plants supplied or non-supplied with Si and non-inoculated or inoculated with H. vastatrix. For the inoculated plants supplied with Si, there was a tendency of occur higher concentrations of the compounds vanillin and caffeine compared to plants non- -supplied with Si and non-inoculated. Plants supplied with Si, regardless of inoculation with H. vastatrix, showed higher values for S/G ratio when compared to non-supplied plants. Even though there was an increase in the concentrations of vanillin and caffeine and higher S/G ration on the leaves of plants supplied with Si and infected with H. vastatrix, this fact did not result in reduction in the symptoms of coffee leaf rust.
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Claims 8
Claim · model-written summary
Silicon supply did not significantly increase foliar silicon.
- Treatment
- supplied with this elemente0
- Outcome
- foliar Si concentratione0
- Direction
- no significant increasee0
CoffeaNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“There was no significant increase in the foliar Si concentration for plants supplied with this element”
t0“coffee plants”
Claim · model-written summary
Silicon supply did not reduce coffee leaf rust symptoms.
- Treatment
- silicont0
- Interactor
- Hemileia vastatrix
Hemileia vastatrixt0pathogen - Outcome
- coffee leaf rust symptomse0
- Direction
- no reductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“there was no reduction on coffee leaf rust symptoms”
t0“coffee plants supplied with silicon and infected with Hemileia vastatrix”
Claim · model-written summary
Eight lignin compounds from the H precursor were identified in coffee leaves.
- Compound
- p-hidroxifenila precursor (H)e0
- Outcome
- compounds derived from lignine0
- Value
- Eight compoundse0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Eight compounds derived from lignin from the p-hidroxifenila precursor (H) were identified”
t0“coffee plants”
Claim · model-written summary
Seven lignin compounds from the G precursor were identified in coffee leaves.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“seven from the precursor guaiacyl (G)”
t0“coffee plants”
Claim · model-written summary
One lignin compound from the S precursor was identified in coffee leaves.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“one from the precursor syringyl (S)”
t0“coffee plants”
Claim · model-written summary
Inoculated silicon supplied plants tended toward higher vanillin concentration than non supplied non inoculated plants.
- Treatment
- supplied with Sie0
- Outcome
- concentrations of the compounds vanilline0
- Direction
- highere0
- Qualifier
- tendencye0
- Comparator
- plants non- -supplied with Si and non-inoculatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the inoculated plants supplied with Si, there was a tendency of occur higher concentrations of the compounds vanillin and caffeine compared to plants non- -supplied with Si and non-inoculated”
t0“coffee plants”
Claim · model-written summary
Inoculated silicon supplied plants tended toward higher caffeine concentration than non supplied non inoculated plants.
- Treatment
- supplied with Sie0
- Outcome
- caffeinee0
- Direction
- highere0
- Qualifier
- tendencye0
- Comparator
- plants non- -supplied with Si and non-inoculatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“For the inoculated plants supplied with Si, there was a tendency of occur higher concentrations of the compounds vanillin and caffeine compared to plants non- -supplied with Si and non-inoculated”
t0“coffee plants”
Claim · model-written summary
Silicon supplied plants had higher S/G ratios regardless of inoculation.
- Treatment
- supplied with Sie0
- Interactor
- H. vastatrixHemileia vastatrixe0pathogen
- Outcome
- S/G ratioe0
- Direction
- highere0
- Qualifier
- regardless of inoculation with H. vastatrixe0
- Comparator
- non-supplied plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plants supplied with Si, regardless of inoculation with H. vastatrix, showed higher values for S/G ratio when compared to non-supplied plants”
t0“coffee plants”
The same questions in other papers
silicon atom · molecular: metabolites · Coffea (coffee)Positive and negative results
1 in the opposite direction
- no effect
silicon atom · Hemileia vastatrix · Coffea (coffee)Results agree
3 papers in the same direction as this paper
- positive
- positive
- 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.