Abstract
The polyacetylene allelopathic compound cis-dehydromatricaria ester ( cis-DME) was extracted from the roots of goldenrod, Solidago altissima L. cis-DME strongly inhibited the growth of lettuce ( Lactuca saliva L. c. v. sacramento) on its radicles and hypocotyls in the presence of light whereas less or no significantly different effects were observed in the dark. The light-activated plant growth inhibitory (PGI) activity of cis-DME was more obvious in lettuce hypocotyls than in radicals. Its PGI activity was compared with the known phototoxic compounds rose bengal and fluoren-9-one. Although the light-activated PGI of cis-DME was not as high as that of rose bengal, and the dose-response relationship was slightly different with those of rose bengal and fluoren-9-one, cis-DME showed a very typical pattern of light-enhanced PGI activity against lettuce seedlings. The inhibition on the growth of lettuce radicles and hypocotyls highly enhanced by the presence of light. A growth enhancement effect was also observed on the radicles of lettuce when treated with lower concentrations of fluoren-9-one. A photosensitization mechanism is proposed here that the PGI activity of cis-DME may involve photosensitization and active oxygen such as singlet oxygen.
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