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Inactivation of Paraquat by an Aqueous Extract of Rehmannia glutinosa

✍ Scribed by Chun, Jae-Chul; Kim, Sung-Eun; Ma, Sang-Yong

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
255 KB
Volume
50
Category
Article
ISSN
1526-498X

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✦ Synopsis

Rehmannia glutinosa (Gaertn.) Libosch. ex Fisch. & Mey. was very tolerant to paraquat (1,1@-dimethyl-4,4@-bipyridinium). The paraquat concentration required to reduce dry weight of R. glutinosa by 50% was 24 mM, whereas (GR 50 ) a similar e †ect was obtained with 0Γ‰75 mM in Zea mays L. (maize, cv. Dekalb) and Glycine max (L.) Merr. (soybean, cv. Kwangkyo). When 1Γ‰5 mM paraquat in 10% aqueous extract of R. glutinosa was applied to maize and soybean, growth inhibition reached 24% and 7%, respectively, of the untreated control. Decreased activity of paraquat due to the extract also occurred in both leaf discs and chloroplasts of soybean. The total amount of [14C]paraquat absorbed into soybean leaves after 48 h was 34%, but it was reduced to 17% when the extract was added. Translocation of [14C]paraquat was also inhibited in the presence of the extract. In thin-layer chromatography (TLC) analysis using various solvent systems, values of [14C]paraquat with the extract di †ered from those without R f the extract. The results suggested that the aqueous extract of R. glutinosa contained a substance which could nullify paraquat activity.

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