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ALLELOPATHY SYMPOSIUM

Allelopathy of Aspergillus japonicus on Crops

^a Y.H. Shi, Inst. of Tropical and Subtropical Ecology, S. China Agric. Univ., Wushan, Guangzhou, 510642, People's Republic of China
^b Elemento Organic Chem. Lab. Nankai Univ., Tianjin 300071, People's Republic of China

Corresponding author (rszeng{at}scau.edu.cn)

The seeds of some dicotyledons fail to germinate and grow well when contaminated by Aspergillus japonicus Saito. One strain of A. japonicus isolated from the seeds of contaminated rape (Brassica campestris L.) inhibited the seedling growth of rape and radish (Raphanus sativus L.) when the fungus was directly inoculated on the seed surface. Metabolites released from the fungus inhibited the seedling germination and seedling growth of rape and radish. The culture filtrate and mycelium acetone (C₃H₆O) extract inhibited the seedling growth of rape. The major allelochemical of A. japonicus was identified by spectroscopic methods as secalonic acid F (SAF). Bioassays showed that SAF at concentration 0.038 mM significantly inhibited the seedling growth of several crops.

Abbreviations: DMF, dimethyl formamide • EIMS, electron impact ionization mass spectrometry • EtOAc, ethyl acetate • NMR, nuclear magnetic resonance • SAA, secalonic acid A • SAD, secalonic acid D • SAF, secalonic acid F

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