Journal of Environmental Biology

Growth responses of in vitro Fusarium oxysporum f. sp. niveum

to external supply of tannic acid

 

Hong-Sheng Wu*¹, Ya-Dong Liu², Xiao-Ian Yang¹,? Xiao-Qing Chen¹, Zeng-Hui Wang¹

Xiang-Yun Kong¹, Xiao-Xue Liu¹ and Shuang Yan¹

 

¹Nanjing University of Information Science and Technology, Nanjing - 210 044, China

 

²Yangzhou Polytechnic Institute, Yangzhou - 225 127, China

 

(Received: February 18, 2009; Revised received: March 15, 2010; Accepted: June 01, 2010)

 

Abstract: Allelochemicals released from root exudates or decaying residues of plants play diversified roles in ecological interactions of plant-pathogen. The objective of this work was to evaluate the allelopathic effect of an externally supplied tannic acid on soil-borne in vitro Fusarium oxysporum f.sp.niveum. Results showed that the tannic acid decreased the growth of the fungus up to 9.5% at 800 mg l^-1. Conidial germination was reduced by 52.3% in comparison with the control. However, sporulation and mycotoxin production by the fungus were stimulated. The activity of pectinase and proteinase were initially increased and finally decreased with increase in concentrations of tannic acid. Tannic acid served as an ecological allelochemical, repressing the growth of the pathogen

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