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The Potential of Novel Bacterial Isolates from Natural Soil for the Control of Brown Rot Disease (Monilinia fructigena) on Apple Fruits
Article

Improving the Biocontrol Potential of Bacterial Antagonists with Salicylic Acid against Brown Rot Disease and Impact on Nectarine Fruits Quality

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Phytopathology Unit, Department of Plant Protection, Ecole Nationale d’Agriculture de Meknès, Km10, Rte Haj Kaddour, BP S/40, Meknès 50001, Morocco
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Laboratory of Plant Protection and Environment, Faculty of Sciences, Moulay Ismail University, P.O. Box, Zitoune, Meknès 11201, Morocco
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Plant Protection Laboratory, INRA, Centre Régional de la Recherche Agronomique (CRRA), Qualipole de Berkane, Berkane 63300, Morocco
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Faculty of Science Semlalia, Cadi Ayyad University, Bd. Prince My Abdellah, B.P. 2390, Marrakech 40000, Morocco
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Department of Arboriculture-Viticulture, Ecole Nationale d’Agriculture de Meknès, Km10, Rte Haj Kaddour, BP S/40, Meknès 50001, Morocco
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Unité de Recherche Résistance Induite et Bio-Protection des Plantes-EA 4707, Université de Reims Champagne-Ardenne, 51100 Reims, France
*
Authors to whom correspondence should be addressed.
Agronomy 2021, 11(2), 209; https://doi.org/10.3390/agronomy11020209
Received: 28 December 2020 / Revised: 16 January 2021 / Accepted: 19 January 2021 / Published: 22 January 2021
The main objective of this study was to evaluate the ability of both antagonistic bacteria Bacillus amyloliquefaciens (SF14) and Alcaligenes faecalis (ACBC1) used in combination with salicylic acid (SA) to effectively control brown rot disease caused by Monilinia fructigena. Four concentrations of salicylic acid (0.5%, 2%, 3.5%, and 5%) were tested under in vitro and in vivo conditions. Furthermore, the impact of biological treatments on nectarine fruit parameters’ quality, in particular, weight loss, titratable acidity, and soluble solids content, was evaluated. Regardless of the bacterium, the results indicated that all combined treatments displayed a strong inhibitory effect on the mycelial growth of M. fructigena and disease severity. Interestingly, all SA concentrations significantly improved the biocontrol activity of each antagonist. The mycelial growth inhibition rate ranged from 9.79% to 88.02% with the highest reduction rate recorded for bacterial antagonists in combination with SA at both concentrations of 0.5% and 3.5%. The in vivo results confirmed the in vitro results with a disease severity varying from 0.00% to 51.91%. A significant biocontrol improvement was obtained with both antagonistic bacteria when used in combination with SA at concentrations of 0.5% and 2%. The lowest disease severity observed with ACBC1 compared with SF14 is likely due to a rapid adaptation and increase of antagonistic bacteria population in wounded sites. The impact of all biological treatments revealed moderate significant changes in the fruit quality parameters with weight loss for several treatments. These results suggest that the improved disease control of both antagonistic bacteria was more likely directly linked to both the inhibitory effects of SA on pathogen growth and induced fruit resistance. View Full-Text
Keywords: Monilinia fructigena; biological control; Bacillus amyloliquefaciens (SF14); Alcaligenes faecalis (ACBC1); salicylic acid; nectarines Monilinia fructigena; biological control; Bacillus amyloliquefaciens (SF14); Alcaligenes faecalis (ACBC1); salicylic acid; nectarines
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MDPI and ACS Style

Lyousfi, N.; Lahlali, R.; Letrib, C.; Belabess, Z.; Ouaabou, R.; Ennahli, S.; Blenzar, A.; Barka, E.A. Improving the Biocontrol Potential of Bacterial Antagonists with Salicylic Acid against Brown Rot Disease and Impact on Nectarine Fruits Quality. Agronomy 2021, 11, 209. https://doi.org/10.3390/agronomy11020209

AMA Style

Lyousfi N, Lahlali R, Letrib C, Belabess Z, Ouaabou R, Ennahli S, Blenzar A, Barka EA. Improving the Biocontrol Potential of Bacterial Antagonists with Salicylic Acid against Brown Rot Disease and Impact on Nectarine Fruits Quality. Agronomy. 2021; 11(2):209. https://doi.org/10.3390/agronomy11020209

Chicago/Turabian Style

Lyousfi, Nadia, Rachid Lahlali, Chaimaa Letrib, Zineb Belabess, Rachida Ouaabou, Said Ennahli, Abdelali Blenzar, and Essaid A. Barka 2021. "Improving the Biocontrol Potential of Bacterial Antagonists with Salicylic Acid against Brown Rot Disease and Impact on Nectarine Fruits Quality" Agronomy 11, no. 2: 209. https://doi.org/10.3390/agronomy11020209

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