title: Growth responses of in vitro Fusarium oxysporum f. sp. niveum to external supply of tannic acid.
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.
authors.affiliation: Nanjing University of Information Science and Technology, Nanjing--210 044, China. wuhscn@gmail.com
authors.forename: Hong-Sheng
authors.initials: HS
authors.lastname: Wu
authors.forename: Ya-Dong
authors.initials: YD
authors.lastname: Liu
authors.forename: Xiao-Ian
authors.initials: XI
authors.lastname: Yang
authors.forename: Xiao-Qing
authors.initials: XQ
authors.lastname: Chen
authors.forename: Zeng-Hui
authors.initials: ZH
authors.lastname: Wang
authors.forename: Xiang-yun
authors.initials: XY
authors.lastname: Kong
authors.forename: Xiao-Xue
authors.initials: XX
authors.lastname: Liu
authors.forename: Shuang
authors.initials: S
authors.lastname: Yan
mesh_terms: D003470:Culture Media; D004305:Dose-Response Relationship, Drug; D005670:Fusarium / Q000187:drug effects* / Q000254:growth & development*; D013634:Tannins / Q000494:pharmacology*
chemical_list: D003470:Culture Media; D013634:Tannins