| In vitro: |
| Bioscience Biotechnology & Biochemistry , 1997 , 61 (9) :1518-1522. | | Ajugatakasins A and B, New Diterpenoids from Ajuga decumbens, and Feeding Stimulative Activity of Related Neoclerodane Analogs toward the Turnip Sawfly[Reference: WebLink] | Adults of the turnip sawfly, Athalia rosae ruficornis, are strongly attracted to the leaves of Ajuga decumhens (Labiatae).
METHODS AND RESULTS:
Specific feeding stimulants of the sawfly were examined in the leaf surface extracts of A. decumbens. Among seven neoclerodane diterpenoids isolated from the extracts, two new analogs, Ajugatakasin A and ajugatakasin B, were characterized as 6α,18-diacetoxy-1β,12-ditigloyloxy-4α,17-epoxyneoclerod-13-en-15,16-olide and its 1β,12-di-(2-methylbutanoyl)-oxy analog, respectively.
CONCLUSIONS:
Among these analogs, clerodendrin D, a very minor constituent which possesses a tetrahydrofurofuran moiety, was identified as the feeding stimulant for A. rosae ruficornis, while the other analogs with an α,β-unsaturated γ-lactone moiety were found to be completely inactive in the sawfly feeding test. |
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