Mycobiology

The Korean Society of Mycology (한국균학회)
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Effect of Ribitol and Plant Hormones on Aposymbiotical Growth of the Lichenforming Fungi of Ramalina farinacea and Ramalina fastigiata

  • Wang, Yi (Korean Lichen Research Institute, Sunchon National University) ;
  • Han, Keon-Seon (Korean Lichen Research Institute, Sunchon National University) ;
  • Wang, Xin Yu (Korean Lichen Research Institute, Sunchon National University) ;
  • Koh, Young-Jin (Korean Lichen Research Institute, Sunchon National University) ;
  • Hur, Jae-Seoun (Korean Lichen Research Institute, Sunchon National University)
  • Published : 2009.03.31
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Abstract

This study was aimed at evaluating the growth promoting effect of symbiotic algal polyol (ribitol) and plant hormones on the lichen-forming fungi (LFF), Ramalina farinacea (CH050010 and 40403) and Ramalina fastigiata. The addition of ribitol to basal (malt-yeast extract) medium enhanced the relative growth rates of all three LFF. R. farinacea (CH050010), R. farinacea (40403) and R. fastigiata (H06127) showed 35.3%, 29.0% and 29.3% higher growth rates, respectively, compared to the control. IBA (indole-3-butyric acid) and TIBA (2,3,5-tridobenzoic acid) also increased growth rates of the LFF by 34 to 64% and 7 to 28%, respectively, compared to the control. The combination of ribitol with IBA or TIBA synergistically increased the growth of all LFF. For example, ribitol and IBA treatments increased growth rates of R. farinacea (CH050010), R. farinacea (40403) and R. fastigiata (H06127) by 79.4%, 40.3% and 72.8% in, respectively, compared to those grown on the basal medium. The stimulating effect of ribitol and IBA on the LFF growth induced vertical development of the fungal mass in culture. We suggest that lichen-forming fungal growth of Ramalina lichens can be stimulated aposymbiotically by supplementing polyols and plant hormones to the basal medium in the mass production of lichen secondary metabolites under large scale culture conditions.

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References

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