Emulsions of essential oils and aloe polysaccharides: Antimicrobial activity and resistance inducer potential against Xanthomonas fragariae

Bacterial angular leaf spot disease ( Xanthomonas fragariae ) is an important strawberry disease and responsible for significant yield losses. The efficacy of emulsions containing tea tree or palmarosa essential oils (EO) against angular leaf spot, seeking to elucidate their mode of action, was eval...

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Bibliographic Details
Published in:Tropical plant pathology 2017-10, Vol.42 (5), p.370-381
Main Authors: Luiz, Caroline, da Rocha Neto, Argus Cezar, Franco, Pedro Ometto, Di Piero, Robson Marcelo
Format: Article
Language:English
Subjects:
Aloe
Antiinfectives and antibacterials
Antimicrobial activity
Antimicrobial agents
Bacteria
Biomedical and Life Sciences
Catalase
Cultivars
Emulsions
Essential oils
Leafspot
Life Sciences
Mode of action
Oils & fats
Original Article
Peroxidase
Phenolic compounds
Phenols
Plant diseases
Plant Pathology
Polysaccharides
Saccharides
Spot
Superoxide dismutase
Trees
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Summary:Bacterial angular leaf spot disease ( Xanthomonas fragariae ) is an important strawberry disease and responsible for significant yield losses. The efficacy of emulsions containing tea tree or palmarosa essential oils (EO) against angular leaf spot, seeking to elucidate their mode of action, was evaluated in this study. Tea tree or palmarosa EO were added in an aqueous suspension of aloe polysaccharide (AP) and tea tree EO emulsion (TAP) and palmarosa EO microemulsion (PAP) were obtained. The antimicrobial potential of AP, TAP and PAP were evaluated in plants of two cultivars (Albion and San Andreas). The ability of these preparations to reduce disease severity and to activate plant defenses were evaluated. AP, TAP and PAP reduced X. fragariae growth by up to 44.0%, 94.4% and 86.1%, respectively. In addition, T AP and P AP suppressed completely the symptoms in both cultivars. Increased activities of superoxide dismutase, dismutase, catalase and peroxidase were observed in the more susceptible cultivar (Albion) treated with the emulsions, while a higher concentration of total phenolic compounds was verified in the less susceptible cultivar (San Andreas). Thus, emulsions with EO and AP can be used to control angular leaf spot by activating latent defense mechanisms in strawberry.
ISSN:1983-2052
1982-5676
1983-2052
DOI:10.1007/s40858-017-0153-5