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Sodium Octanoate–Functionalized Chitosan Coating Reduces Dry Rot Caused by Fusarium Sambucinum (AUC-TZ-1) in Potato Minitubers in Storage

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Potato (Solanum tuberosum L.) is a crop susceptible to infection by microorganisms such as Fusarium spp., which are usually controlled with chemical fungicides. However, these fungicides can cause adverse effects on human and ecosystem health. Thus, the search for non-toxic alternatives is essential to reduce the negative impact of fungicides. This study aimed to identify fungal isolates from potato minitubers that were showing dry rot symptoms and evaluate whether the combination of chitosan (CH) and sodium octanoate (SO) exhibits higher antifungal effects in vitro and in vivo than the application of individual compounds. Five pathogens of the Fusarium genus were isolated. The most aggressive isolate (AUC-TZ-1) showed 98.67% identity with F. sambucinum, which was previously reported as a potato pathogen. The antifungal index (AI) of CH, SO and the CH + SO biocomposite showed that individual compounds and the biocomposite led to significant inhibition (p ≤ 0.05) of the mycelial growth of the pathogen by 100%, 62.1% and 100%, respectively, at the highest concentrations tested (7.5, 0.49 and 7.5 + 0.49 mg/mL, respectively). However, only CH and CH + SO caused a significant reduction in the dry rot severity index of potato minitubers inoculated with F. sambucinum (AUC-TZ-1). The results suggest that these compounds could be used in postharvest potato dry rot control.

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The authors appreciate the technical support provided by Ing. Roberto Zepeda Anaya.


This study was funded by the Universidad de La Ciénega del Estado de Michoacán de Ocampo (UCEMICH), under the grant number SA/PI/002/20/08/19.

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Pedro Damián Loeza-Lara wrote the project, sought funding and wrote the main draft of the article. He also edited the final version of the article. Rafael Jiménez-Mejía, Gustavo Santoyo and Ricardo Ivan Medina-Estrada reviewed and edited the draft article. They also contributed to the methodological research. Mariana Corona-Márquez and Jessica Guadalupe Zepeda-García performed in vitro and in vivo bioassays. Cristina Rodríguez-Cárdenas identified pathogenic fungi by morphology. Luzmaría Raquel Morales-Cedeño and Gustavo Santoyo identified the pathogenic fungi using molecular biology techniques. Mónica Guadalupe Sánchez-Ceja performed in vivo bioassays with Fusarium sambucinum (AUC-TZ-1). All the authors reviewed and authorized this final version of the article for submission to the journal.

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Correspondence to Pedro D. Loeza-Lara.

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Jiménez-Mejía, R., Corona-Márquez, M., Zepeda-García, J.G. et al. Sodium Octanoate–Functionalized Chitosan Coating Reduces Dry Rot Caused by Fusarium Sambucinum (AUC-TZ-1) in Potato Minitubers in Storage. Potato Res. 66, 1059–1074 (2023).

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