Phytotoxic and antimicrobial activity of 5,7-dihydroxychromone from peanut shells
1995
Vaughn, S.F.
A flavonoid decomposition product that is present in peanut (Arachis hypogaea) shells, 5,7-dihydroxychromone (DHC), was found to inhibit the radial growth of cultures of the soil pathogenic fungi Rhizoctonia solani and Sclerotium rolfsii with I50 (the concentrations of DHC required to inhibit growth 50%) values of 18 and 26 micromolars, respectively. Radicle elongation of velvetleaf, corn, peanut, and wheat was inhibited by DHC with I50 values of 30, 50, 65 and 200 micromolars, respectively. DHC had no effect on the growth of Bradyrhizobium sp. at 10 micromolars in medium containing low (1.0 g/liter) mannitol as the carbon source, although the related flavones luteolin and chrysin each promoted bacterial growth at 10 micromolars 48 hr after inoculation. When tested in high (10.0 g/liter) mannitol medium, DHC initially inhibited growth of Bradyrhizobium sp., but 120 hr after inoculation the growth of all treatments were similar. These results suggest a role for DHC released from peanut shells in suppressing pathogenic fungal infection and competing plant growth but not for Bradyrhizobium growth promotion.
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