Artigo
Phytotoxicity of sorgoleone found in grain sorghum root exudates
Registration in:
EINHELLIG, F. A.; SOUZA, I. F. Phytotoxicity of sorgoleone found in grain sorghum root exudates. Journal of Chemical Ecology, [S.l.], v. 18, n. 1, p. 1-11, 1992.
Author
Einhellig, Frank A.
Souza, Itamar F.
Institutions
Abstract
Root exudates of Sorghum bicolor consist primarily of a dihydroquinone
that is quickly oxidized to a p-benzoquinone named sorgoleone. The
aim of this investigation was to determine the potential activity of sorgoleone
as an inhibitor of weed growth. Bioassays showed 125 tiM sorgoleone reduced
radicle elongation of Eragrostis tef. In liquid culture, 50-#M sorgoleone
treatments stunted the growth of Lemna minor. Over a 10-day treatment
period, 10 tzM sorgoleone in the nutrient medium reduced the growth of all
weed seedlings tested: Abutilon theophrasti, Datura stramonium, Amaranthus
retroflexus, Setaria viridis, Digitaria sanguinalis, and Echinochloa crusgalli.
These data show sorgoleone has biological activity at extremely low
concentrations, suggesting a strong contribution to Sorghum allelopathy.