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Synergistic interaction of physcion and chrysophanol on plant powdery mildew
Author(s) -
Yang Xiaojun,
Yang Lijun,
Wang Shaonan,
Yu Dazhao,
Ni Hanwen
Publication year - 2007
Publication title -
pest management science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.296
H-Index - 125
eISSN - 1526-4998
pISSN - 1526-498X
DOI - 10.1002/ps.1362
Subject(s) - powdery mildew , sphaerotheca , blumeria graminis , mildew , chemistry , botany , horticulture , biology , plant disease resistance , biochemistry , gene
The extract of the plant Rheum officinale Baill, mainly containing the anthraquinones physcion and chrysophanol, is highly active against plant powdery mildew. Experiments were conducted in the laboratory and greenhouse to determine the interaction of the two compounds on cucumber powdery mildew [ Sphaerotheca fuliginea (Schlecht.) Poll] and on wheat powdery mildew [ Blumeria graminis (DC.) Speer f. sp. tritici Marchal]. Physcion was much more bioactive than chrysophanol against these powdery mildews. There was a significant synergistic interaction between the two compounds on the diseases when the ratios of physcion to chrysophanol ranged from 1:9 to 5:5. The synergistic degree increased with increase in the chrysophanol proportion in the combination. The findings indicate that, in order to ensure constant efficacy of the extract on the disease, both the contents and the proportion of the main active ingredients physcion and chrysophanol have to be determined. Copyright © 2007 Society of Chemical Industry