Abstract
Abstract Coffee leaf rust, caused by Hemileia vastatrix , is the most devastating disease of coffee. Since limited information is available in the literature on silicon (Si) affecting plant diseases in coffee, this study was designed to investigate foliar application of potassium silicate ( PS ), a source of soluble (Si), on infection process of coffee leaf rust at the microscopic level. The foliar Si concentration for plants sprayed with water and PS has no significant difference (0.24 and 0.30 dag kg −1 , respectively). X‐ray microanalysis indicated that the deposition of Si on the leaves of the plants that were sprayed with PS was greater in comparison to the leaf samples from the plants sprayed with water. Rust severity on leaves of plants sprayed with water or sprayed with PS reached 44% and 32%, respectively, at 36 days after inoculation (dai). Plates of polymerised PS were observed on the leaf surfaces of the plants sprayed with the product, in contrast to its absence on the leaf surfaces of plants sprayed with water. At 36 dai, a greater number of uredia were observed on the leaf surfaces of plants sprayed with water in comparison to the leaf surfaces of plants sprayed with PS . On fractured leaf tissues that were sprayed with PS , less fungal colonisation was observed in comparison to the leaves of plants sprayed with water. In conclusion, the results of this study suggest that the effect of foliar‐applied Si on the control of the coffee leaf rust development may be attributed to the physical role of the polymerised PS , its osmotic effect against urediniospores germination, or both.
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Claims 7
Claim · model-written summary
Foliar silicon concentration did not differ significantly between water and potassium silicate sprays.
- Treatment
- PSe0
- Outcome
- foliar Si concentratione0
- Direction
- no significant differencee0
- Value
- 0.30 dag kg −1e0
- Qualifier
- 0.24e0
- Comparator
- watere0
CoffeaOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The foliar Si concentration for plants sprayed with water and PS has no significant difference (0.24 and 0.30 dag kg −1 , respectively).”
t0“coffee”
Claim · model-written summary
Potassium silicate increased Si deposition on coffee leaves versus water.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the deposition of Si on the leaves of the plants that were sprayed with PS was greater in comparison to the leaf samples from the plants sprayed with water.”
t0“coffee”
Claim · model-written summary
Rust severity reached 32% with potassium silicate versus 44% with water at 36 days after inoculation.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Rust severity on leaves of plants sprayed with water or sprayed with PS reached 44% and 32%, respectively, at 36 days after inoculation (dai).”
t0“coffee”
Claim · model-written summary
Polymerised potassium silicate plates appeared on treated leaf surfaces and were absent with water.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Plates of polymerised PS were observed on the leaf surfaces of the plants sprayed with the product, in contrast to its absence on the leaf surfaces of plants sprayed with water.”
t0“coffee”
Claim · model-written summary
Water sprayed leaves had more uredia than potassium silicate sprayed leaves at 36 days.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At 36 dai, a greater number of uredia were observed on the leaf surfaces of plants sprayed with water in comparison to the leaf surfaces of plants sprayed with PS .”
t0“coffee”
Claim · model-written summary
Potassium silicate treated leaves had less fungal colonisation than water sprayed leaves.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“On fractured leaf tissues that were sprayed with PS , less fungal colonisation was observed in comparison to the leaves of plants sprayed with water.”
t0“coffee”
Claim · model-written summary
The authors suggest a physical role for polymerised potassium silicate, an osmotic effect on urediniospore germination, or both.
- Treatment
- foliar‐applied Sie0
- Outcome
- control of the coffee leaf rust developmente0
- Qualifier
- physical role of the polymerised PS , its osmotic effect against urediniospores germination, or bothe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the effect of foliar‐applied Si on the control of the coffee leaf rust development may be attributed to the physical role of the polymerised PS , its osmotic effect against urediniospores germination, or both.”
The same questions in other papers
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1 paper more in this group
See all 5 papers →potassium · nutrient: content · Coffea (coffee)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.