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《Chinese Journal of Animal and Veterinary Sciences》 2015-01
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Influence of Different Factors on Swainsonine Production in Fungal Endophyte from Locoweed

ZHANG Lei-lei;YU Yong-tao;HE Sheng-hu;ZHAO Qing-mei;GE Song;College of Agronomy Ningxia University;College of Biological Science and Engineering,Beifang University of Nationalities;Key Laboratory of Fermentation Brewing Engineering and Biotechnology of State Nationalities Affairs Commission;  
The research was conducted to screen the influence factors on swainsonine production in fungal endophyte,Undifilum oxytropis,from locoweed.U.oxytropis were inoculated in liquid medium of different pH or containing different concentration of PEG,L-pipecolic acid,L-lysine andɑ-ketoglutaric acid,respectively.To estimate the influence of different factors on swainsonine production in U.oxytropis,the swainsonine of cultured fungal mycelia and zymotic fluid were extracted and detected after shaking culture.The results showed that low pH(pH4.5)inhibit significantly(P0.05)the synthesis of swainsonine in fungi.With the increase of PEG in culture medium,the production of swainsonine in fungi was also inhibited significantly(P0.01).When the fungi were inoculated respectively in liquid medium that contained equivalent concentration(10-3 mol·L-1)of L-pipecolic acid,L-lysine orɑ-ketoglutaric acid,the production of swainsoninewas inhibited significantly(P0.05)in the group added L-pipecolic acid.However,the yield of swainsonine were increased significantly(P0.05)in the group added L-lysine.When the initial concentration of L-pipecolic acid was 10-3 and 10-2 mol·L-1,the production of swainsonine in U.oxytropis was inhibited significantly(P0.05).However,when the initial concentration of Lpipecolic acid was 10-4 mol·L-1,the yield of swainsonine in U.oxytropis was increased significantly(P0.01).When the initial concentration of L-lysine was 10-1,10-2and 10-4 mol·L-1,the production of swainsonine in U.oxytropis was inhibited significantly(P0.05).When the initial concentration ofɑ-ketoglutaric acid was 10-1,10-2and 10-3 mol·L-1,the production of swainsonine in U.oxytropis was inhibited significantly(P0.05).Low pH or PEG added to medium could significantly inhibit the production of swainsonine in U.oxytropis.It was significant that the influence of L-pipecolic acid,L-lysine andɑ-ketoglutaric acid on the swainsonine producing of fungal endophyte.However,the extent of influence on fungal swainsonine producing was highly correlated with the concentration of L-pipecolic acid,L-lysine andɑ-ketoglutaric in liquid media.
【Fund】: 国家自然科学基金(31201962);; 宁夏自然科学基金(NZ1118)
【CateGory Index】: S852.66
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