Thyme Essential Oil Reduces Disease Severity and Induces Resistance against IAlternaria linariae/I in Tomato Plants

Currently, the use of alternative tools for chemical control has become one of the most sustainable and eco-friendly options for crop protection against phytopathogens. Thus, the present study aimed to assess the effect of essential oils (EOs) on the control of tomato early blight (EB), a highly des...

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Veröffentlicht in:Horticulturae 2022-10, Vol.8 (10)
Hauptverfasser: Saltos-Rezabala, Luis Alberto, Silveira, Patrícia Ricardino Da, Tavares, Dérica Gonçalves, Moreira, Silvino Intra, Magalhães, Thiago Alves, Botelho, Deila Magna Dos Santos, Alves, Eduardo
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container_issue 10
container_start_page
container_title Horticulturae
container_volume 8
creator Saltos-Rezabala, Luis Alberto
Silveira, Patrícia Ricardino Da
Tavares, Dérica Gonçalves
Moreira, Silvino Intra
Magalhães, Thiago Alves
Botelho, Deila Magna Dos Santos
Alves, Eduardo
description Currently, the use of alternative tools for chemical control has become one of the most sustainable and eco-friendly options for crop protection against phytopathogens. Thus, the present study aimed to assess the effect of essential oils (EOs) on the control of tomato early blight (EB), a highly destructive disease of this crop. The antifungal activity and ability to induce resistance induction of the EOs of thyme (Thymus vulgaris), lemongrass (Cymbopogon citratus) and tea tree (Melaleuca alternifolia) were tested for control of A. linariae in tomato plants. In vitro, mycelial growth and conidial germination were strongly inhibited when thyme EO (TEO; 2000 ppm) and lemongrass (LGEO; 2000 ppm) were applied. The infected leaf area and final disease index were decreased by 47.78% and 39.00%, respectively, compared to the water treatment. Foliar spraying with TEO increased the activity of the defense-related enzymes peroxidase, polyphenol oxidase and β-1,3-glucanase. Furthermore, callose deposition and phenolic compound accumulation in tissues infected by A. linariae improved after TEO application. In conclusion, TEO stimulated the defense system of tomato plants infected by A. linariae, which was associated with a reduced severity of EB. These results indicate that TEO is a potential tool in tomato EB disease management.
doi_str_mv 10.3390/horticulturae8100919
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subjects Biological control
Control
Diseases and pests
Environmental aspects
Essences and essential oils
Fungi, Phytopathogenic
Horticultural research
Pests
Plant immunology
Thymes
Tomatoes
title Thyme Essential Oil Reduces Disease Severity and Induces Resistance against IAlternaria linariae/I in Tomato Plants
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