Phytotoxic Activity of a Benzofuran Isolated from Trichocline reptans
نویسندگان
چکیده
Phytotoxic Activity of the 6-acetyl-5-hydroxy-2isopropenyl-2,3-dihydrobenzofurane (1) isolated from Trichocline reptans (Asteraceae) was investigated in two weed species. Results indicate that the best growth inhibition effect ocurres on Chenopodium album weed. Phythotoxic effect of the T. reptans chloroformic extract and of the benzofurane are discussed and compared in the two weed species. Introduction In previous phytochemical study in Trichocline reptans (Asteraceae) collected in Salta, Argentina, we identified benzofurane 1, linear furanocoumarins and coumarins [1]. Regarding the importance of benefical or toxic biochemical interactions that ocurrs between higher plants, where Allelopatie is the reference [2], we evaluated the phytotoxic effect of both the extract of T. reptans and the benzofurane on two weed species that affect our country cultivars, Chenopodium album and Sorghum halepense. We tested the inhibitory effect on radicle and leaf growth [3]. Experimental Dihydrobenzofurane 1 was isolated from the Cl3CH extract by “dry column chromatography” method. The structure of this compound was elucidated by spectroscopic methods: UV, IR, HRMN , O HO H3C O 1 2 3 4 5 6 7 8 9
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