Comparative characteristics of Lupinus perennis L. under allelochemical sorgoleone stress

The aim of the present work was evaluation of the allelophatic potential of sorgoleones on Lupinus perennis. The compounds were isolated by column chromatography C8 from Sorghum halepense. Were prepared different concentrations extracts from Sorghum Halepense, and then was assessed the tolerance of Lupinus perennis L. (Fabaceae) after treatment with these extracts. The effects were studied by the seeds germination biotest, plantlets growth and photosynthetic pigments dosage. The preliminary chemical analysis of S. halepense extract indicated the presence of the sorgoleone and dihydrosorgoleone, the identification of these compounds being confirmed by specific reactions. The germination was not affected by any of the tested extracts, but the growth was inhibited by the allelopathic compounds present in the composition of S. halepense extracts. Based on these results, it can be stated that the tested species showed sensitivity in the presence of the allelochemicals in the medium growth. The aqueous extracts of S. halepense are appropriate for use in situations when certain plants species are harmful.