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Isolation and structure elucidation of antifungal compounds from the antarctic lichens, Stereocaulon alpinum and Sphaerophorus globosus

  • Kim, Young-Shin (Department of Bio Environmental Chemistry, Chungnam National University) ;
  • Lim, Chi-Hwan (Department of Bio Environmental Chemistry, Chungnam National University)
  • Received : 2020.01.15
  • Accepted : 2020.02.26
  • Published : 2020.03.01

Abstract

Lichens are composite organisms consisting of a symbiotic association of a fungus with a photosynthetic partner (the photobiont or phycobiont), usually either a green alga or cyanobacterium. According to more recent studies, the biological activities of lichens and lichen substances include an antibiotic activity, antitumor and antimutagenic activity against human immunodeficiency virus (HIV), allergenic activity, plant growth inhibitory activity, and enzyme inhibitory activity. This study screened lichen extracts with a potent in vitro antifungal activity against plant diseases caused by phytopathogenic fungi. The compounds were isolated from Stereocaulon alpinum and Sphaerophorus globosus, and their chemical structures were identified as methyl hematommate, methyl β-orsellinate, 5-hydroxyferulic acid, sphaerophorin, and 2-heptyl-4,6-dimethoxybenzoic acid by electron ionization mass spectrometry (EI-MS) and nuclear magnetic resonance (NMR) spectral analyses. In vitro disease control against Alternaria mali, Cochliobolus miyabeanus, Colletotrium gloeosporioides, and Verticillum dahliae was evaluated. And among the five compounds, only methyl hematommate was effective against A. mali, C. miyabeanus, and C. gloeosporioides. The compounds were isolated from these lichens, which have a similar biosynthetic pathway, respectively. This is the first report of these compounds being isolated from these lichens.

Keywords

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