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Molecules 2011, 16(1), 847-856; doi:10.3390/molecules16010847
Article

Enhancement of Diepoxin ζ Production by Yeast Extract and Its Fractions in Liquid Culture of Berkleasmium-Like Endophytic Fungus Dzf12 from Dioscorea zingiberensis

, , , , , ,  and *
College of Agronomy and Biotechnology, China Agricultural University, Beijing 100193, China
* Author to whom correspondence should be addressed.
Received: 14 December 2010 / Revised: 7 January 2011 / Accepted: 18 January 2011 / Published: 19 January 2011
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Abstract

This study was to examine the effects of yeast extract (YE) and its fractions (YE1 and YE2) on the growth and diepoxin ζ (a spirobisnaphthalene with a diversity of bioactivities) production in liquid culture of Berkleasmium-like endophytic fungus Dzf12 from Dioscorea zingiberensis. When YE was applied to the liquid medium at 10 g/L on day 3 of culture, the diepoxin ζ production was most effectively enhanced 3.2-fold (378.70 mg/L versus 120.09 mg/L in control) after another 10 days culture. Feeding with 15 g/L of YE on day 9, the mycelia biomass reached 16.44 g/L, about 2.3-fold in comparison with the control (7.15 g/L). The polysaccharide fraction (YE1) was mainly responsible for stimulating diepoxin ζ accumulation, and the non-polysaccharide fraction (YE2) was mainly responsible for promoting mycelia growth. The results showed that the diepoxin ζ production in liquid culture of endophyte Dzf12 could be effectively enhanced by YE and its fractions.
Keywords: diepoxin ζ; Berkleasmium-like endophytic fungus Dzf12; Dioscorea zingiberensis; yeast extract (YE); polysaccharide fraction; non-polysaccharide fraction; enhancement diepoxin ζ; Berkleasmium-like endophytic fungus Dzf12; Dioscorea zingiberensis; yeast extract (YE); polysaccharide fraction; non-polysaccharide fraction; enhancement
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Zhao, J.; Zheng, B.; Li, Y.; Shan, T.; Mou, Y.; Lu, S.; Li, P.; Zhou, L. Enhancement of Diepoxin ζ Production by Yeast Extract and Its Fractions in Liquid Culture of Berkleasmium-Like Endophytic Fungus Dzf12 from Dioscorea zingiberensis. Molecules 2011, 16, 847-856.

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