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標題: Effect of extracts of Chinese medicinal herbs on spore germination of Altemaria brassicicola, and nature ofan inhibitory substance from gallnuts of Chinese sumac (Rhus chinensis)
作者: Ho, W.C.
Su, H.J.
Li, J.W.
Ko, W.H.
關鍵字: gallnut;Rhus chinensis;Chinese medicinal herbs;inhibitory substance;Altemaria brassicicola;spore germination
Project: Canadian Journal of Plant Pathology-Revue Canadienne De Phytopathologie
期刊/報告no:: Canadian Journal of Plant Pathology-Revue Canadienne De Phytopathologie, Volume 28, Issue 4, Page(s) 519-525.
Seventy Chinese medicinal herbs were screened for antifungal activity, and more than 15% of these contained substances inhibitory to conidial germination of Alternaria brassicicola in their aqueous extracts. The most inhibitory extract was from gallnut of Chinese sumac (Rhus chinensis). In addition to inhibiting A. brassicicola, the gallnut extract was also strongly inhibitory to Colletotrichttin gloeosporioides, Corynespora cassficola, Fusarium oxysporutn f. sp. niveum, Fusarium oxysporuin f. sp. tracheiphilum, Phytophthora capsici, and Phytophthora infestans but not to Pestalotiopsis luginae. The inhibitory substance in the gallnut extract was fungistatic to A. brassicicola during short-term exposure but became fungicidal when the exposure time was extended. It was stable at low pH but unstable at high pH. The inhibitor in the gallnut was readily extracted with polar solvents but not with nonpolar solvents. The inhibitory substance in the aqueous extract was dialyzable in membrane tubing with a molecular-weight cut-off of 14 000, 3500, or 1000 but not 500, indicating that the inhibitor has a molecular weight between 500 and 1000.
ISSN: 0706-0661
Appears in Collections:期刊論文

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