Abstract
Although Arabidopsis thaliana is well known as a model plant, few bioactive substances of this plant have been reported except for some phytohormones. In our search for bioactive substances from A. thaliana, four new glycolipids, arabidopsides A~D (1~4) have been isolated from this plant. Compounds 1~4 were monogalactosyl and digalactosyl diacylglycerides containing 12-oxophytodienoic acid (OPDA) and/or dinor-oxophytodienoic acid (dn-OPDA). Further search for bioactive substances of A. thaliana resulted in isolation of two glycolipids 5 and 6, and the structures of 5 and 6 were elucidated by spectroscopic data and chemical means.
Arabidopsides A (1), B (2), and D (4) exhibited inhibitory effect on the growth of the root of cress, while arabidopside A (1) promoted chlorophyll degradation of oat leaf, and the senescence promoting activity was more effective than OPDA, and as strong as methyl jasmonate. it was suggested that arabidopside A (1) play important roles in leaf senescence A. thaliana.
