4.7 Article

Antifungal activity of chitosan against Phytophthora infestans, the pathogen of potato late blight

期刊

出版社

ELSEVIER
DOI: 10.1016/j.ijbiomac.2020.11.016

关键词

Phytophthora infestans; Chitosan; Potato late blight; Antifungal activity; Pesticide synergy; Transctiptome

资金

  1. National Key Research and Development Program of China [2018YFD0200808, 2016YFD0100306]
  2. Chongqing Natural Science Foundation [cstc2019jcyj-msxmX0127]
  3. Chongqing Youth Innovative Talent Training Project [CY190103]

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Chitosan shows significant inhibition on the mycelial growth and spore germination of Phytophthora infestans, reducing its resistance to adverse conditions and having synergistic effects with pesticides. It also induces resistance in potatoes to the pathogen, with transcriptome analysis showing effects on cell growth and key pathways. This study provides new insights for the development of chitosan as an eco-friendly solution for controlling potato late blight.
Phytophthora infestans, the pathogen of potato late blight which is a devastating disease of potatoes, causes stem and leaf rot, leading to significant economic losses. Chitosan is a naturally occurring polysaccharide with a broad spectrum of antimicrobial properties. However, the specific mechanism of chitosan on Phytophihora infestans has not been studied. In this study, we found that chitosan significantly inhibited the mycelial growth and spore germination of Phytophthora infestans in vitro, reduced the resistance of Phytophihora infestans to various adverse conditions, and it had synergistic effect with pesticides, making it a potential way to reduce the use of chemical pesticides. In addition, chitosan could induce resistance in potato pieces and leaves to Phytophthora infestans. Transcriptome analysis data showed that chitosan mainly affected cell growth of Phytophthora infestans, and most of the Kyoto Encyclopedia of Genes and Genomes (KEGG) pathways and Gene ontology (GO) terms revolved in metabolic processes, cell membrane structure and function and ribosome biogenesis. Differentially expressed genes (DEGs) related to adverse stress and virulence were also discussed. On the whole, this study provided new ideas for the development of chitosan as an eco-friendly preparation for controlling potato late blight. (C) 2020 Published by Elsevier B.V.

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