Effect of foliar‐applied potassium silicate on coffee leaf infection by Hemileia vastatrix

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 so...

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Veröffentlicht in:Annals of applied biology 2014-05, Vol.164 (3), p.396-403
Hauptverfasser: Carré‐Missio, V, Rodrigues, F.A, Schurt, D.A, Resende, R.S, Souza, N.F.A, Rezende, D.C, Moreira, W.R, Zambolim, L
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container_end_page 403
container_issue 3
container_start_page 396
container_title Annals of applied biology
container_volume 164
creator Carré‐Missio, V
Rodrigues, F.A
Schurt, D.A
Resende, R.S
Souza, N.F.A
Rezende, D.C
Moreira, W.R
Zambolim, L
description 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.
doi_str_mv 10.1111/aab.12109
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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.</description><identifier>ISSN: 0003-4746</identifier><identifier>EISSN: 1744-7348</identifier><identifier>DOI: 10.1111/aab.12109</identifier><identifier>CODEN: AABIAV</identifier><language>eng</language><publisher>Oxford, UK: Blackwell Publishing Ltd</publisher><subject>Agronomy. 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Soil science and plant productions</topic><topic>Biological and medical sciences</topic><topic>Coffea arabica L</topic><topic>Coffee</topic><topic>foliar application</topic><topic>Fundamental and applied biological sciences. Psychology</topic><topic>fungi</topic><topic>germination</topic><topic>Hemileia vastatrix</topic><topic>leaf rust</topic><topic>Leaves</topic><topic>mineral nutrition</topic><topic>Phytopathology. Animal pests. 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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.</abstract><cop>Oxford, UK</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1111/aab.12109</doi><tpages>8</tpages></addata></record>
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subjects Agronomy. Soil science and plant productions
Biological and medical sciences
Coffea arabica L
Coffee
foliar application
Fundamental and applied biological sciences. Psychology
fungi
germination
Hemileia vastatrix
leaf rust
Leaves
mineral nutrition
Phytopathology. Animal pests. Plant and forest protection
Plant diseases
Plant tissues
Plants
polymerization
Potassium
rust
scanning electron microscopy
silicon
urediniospores
title Effect of foliar‐applied potassium silicate on coffee leaf infection by Hemileia vastatrix
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