In vitro growth of Fusarium oxysporum f. sp. niveum in chemically defined citric acid
2011
Hong-sheng Wu | Xiao-qing Chen | Xiao-han, | Yang, Nanjing Univ. of Information Science and Technology, Nanjing 210044 (China). Dept. of Agricultural Resources and Environment | Ya-dong Liu, Yangzhou Polytechnic Inst., Yangzhou (China) | Geng-Mao Zhao, Nanjing Agriucltural Univ., Nanjing 210095 (China). Coll. of Resources and Environmental Sciences
The aim of this work was to study the allelopathic effect of an artificially applied citric acid on in vitro Fusarium oxysporum L. sp. niveum in the laboratory. Results showed that citric acid at low concentrations (200-400 mg/ L) slightly stimulated the growth of Fusarium oxysporum L. sp. niveum, while strongly inhibited its growth at high concentrations (800-1600 mg/L). The biomass and the conidia germinating rate were reduced by 54.5 and 100%, respectively. However, sporulation and mycotoxin production by Fusarium oxysporum L. sp. niveum were greatly stimulated with an increase of 381.4% for sporulation yield and 183.6% for mycotoxin. The activity of pectinase was increased by 9.7%, of protinase by 113.8%, and of cellulase by 120.2%, while the activity of amylase was decreased by 13.516%.
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