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KMID : 1160220090370010028
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Mycobiology
2009 Volume.37 No. 1 p.28 ~ p.30
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Effect of Ribitol and Plant Hormones on Aposymbiotical Growth of the Lichenforming Fungi of Ramalina farinacea and Ramalina fastigiata
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Wang Yi
Han Keon-Seon
Wang Xin Yu
Koh Young-Jin
Hur Jae-Seoun
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Abstract
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This study was aimed at evaluating the growth promoting effect of symbiotic algal polyol (ribitol) and plant hormones onthe lichen-forming fungi (LFF), Ramalina farinacea (CH050010 and 40403) and Ramalina fastigiata. The addition of ribitolto 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 tothe control. IBA (indole-3-butyric acid) and TIBA (2,3,5-tridobenzoic acid) also increased growth rates of the LFF by 34to 64% and 7 to 28%, respectively, compared to the control. The combination of ribitol with IBA or TIBA synergisticallyincreased 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 onthe basal medium. The stimulating effect of ribitol and IBA on the LFF growth induced vertical development of the fungalmass in culture. We suggest that lichen-forming fungal growth of Ramalina lichens can be stimulated aposymbiotically bysupplementing polyols and plant hormones to the basal medium in the mass production of lichen secondary metabolitesunder large scale culture conditions.
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KEYWORD
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Fungal growth, Indole-3-butyric acid, Lichen-forming fungi, 2, 3, 5-Tridobenzoic acid, Ribitol
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