Combined chitosan and Cympobogon citratus (D.C. ex Nees) Stapf. essential oil to inhibit the fungal phytopathogen Paramy
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FOOD MICROBIOLOGY - RESEARCH PAPER
Combined chitosan and Cympobogon citratus (D.C. ex Nees) Stapf. essential oil to inhibit the fungal phytopathogen Paramyrothecium roridum and control crater rot in melon (Cucumis melo L.) Samara Alves Macedo 1 & Giovanna Alencar Lundgren 2 & Selma dos Passos Braga 2 & Evandro Leite de Souza 2 Marcos Paz Saraiva Câmara 1
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Received: 3 July 2020 / Accepted: 4 September 2020 # Sociedade Brasileira de Microbiologia 2020
Abstract This study evaluated the efficacy of combined chitosan (Chi) and Cymbopogon citratus (DC) Stapf. essential oil (CCEO) to inhibit the fungal phytopathogen Paramyrothecium roridum L. Lombard & Crous and control crater rot in melon (Cucumis melo L.). Effects of several Chi and CCEO concentrations to inhibit the growth of four P. roridum isolates in vitro, as well as the type of interaction of some combined concentrations of Chi and CCEO was evaluated. Effects of coatings with combined concentrations of Chi and CCEO on development of crater rot lesions in melon artificially inoculated with P. roridum during storage (15 days, 25 °C) were measured. Chi (2.5, 3.75, 5, and 6.75 mg/mL) and CCEO (0.3 and 0.6 μL/mL) led to growth inhibition of the four examined P. roridum isolates. Combinations of Chi (5 mg/mL) and CCEO (0.15 and 0.3 μL/mL) had additive interaction to inhibit P. roridum. Coatings with additive combined concentrations of Chi and CCEO decreased the development and severity of carter rot lesions in melon during room storage regardless of the inoculated P. roridum isolate. Therefore, application of coatings formulated with combined concentrations of Chi and CCEO could be alternative strategies to control crater rot caused by P. roridum in melon and decrease synthetic fungicide use in this fruit. Keywords Paramyrothecium . Antifungal effect . Edible coating . Polymer . Lemongrass . Postharvest control
Introduction Fruit agro-industry is an important economic sector in Brazil with an estimated current annual production of 44 million tons of fruit, ranking the country as the third-largest fruit producer in the world, following China and India. Among fruit most produced in Brazil, melon (Cucumis melo L., family Responsible Editor: Luis Augusto Nero Electronic supplementary material The online version of this article (https://doi.org/10.1007/s42770-020-00378-y) contains supplementary material, which is available to authorized users. * Evandro Leite de Souza [email protected] 1
Laboratório de Micologia, Departamento de Agronomia, Universidade Federal Rural de Pernambuco, Recife, Brazil
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Laboratório de Microbiologia de Alimentos, Departamento de Nutrição, Centro de Ciências da Saúde, Universidade Federal da Paraíba, Campus I, 58051-900, Cidade Universitária, Joao Pessoa, Paraíba, Brazil
Curcubitaceae) stands out because of its high production and good acceptance by consumers worldwide. Brazilian Northeastern region is responsible for almost all the Brazilian melon production, which is destined for domestic and export market [1]. Despite of the
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