Studies on the Phenylphenol Derivatives with Biological Activity

Cheng, Hong-Ming; Etō, Morifusa; Kuwatsuka, Shozo; Oshima, Yasuyoshi

doi:10.1080/00021369.1968.10859062

Cited by 2 publications

(1 citation statement)

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“…Among these compounds are the well known herbicides D N O C and Dinoseb, whose mode of action had been thought so far to be in res piration rather than photosynthesis (see for example [2,3,30]). Also among the halogenated nitrophenols described here as potent inhibitors of photosynthetic electron flow, effective herbicides are known [30,31]. Furtherm ore, the effective electron flow inhibi tor «-butyl-3,5-diiodo-4-hydroxy benzoate described by Avron and Shavit [32] as well as Lis (lithium salt of diiodo-salicylat -a protein binding compound) checked on fluorescence pattern by H om ann [33] be long to this new class of photosynthesis inhibitors with biochemical behaviour like brom onitrothym ol and the other halogenated cyano-and nitrophenols, described here.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Analogues of Dibromothymoquinone and of Bromonitrothymol on Photosynthetic Electron Flow

Trebst

Reimer

Draber

et al. 1979

Zeitschrift Für Naturforschung C

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Alkyl substituted derivatives of halogenated p-benzoquinones, of halogenated /7-nitrophenols, and of 2,4-dinitrophenols were tested in the inhibition of photosynthetic electron flow in chloro plasts. The effect of the compounds on photoreductions by photosystem I or II, on a TMPD bypass in NADPH formation and the reversibility of the inhibition by dithiothreitol is used to distin guish between an inhibition site before or after plastoquinone function, i. e. between a DBMIB versus a DCMU inhibition pattern.It is shown, that different isopropyl and /-butyl substituted halogenated p-benzoquinones are as effective and specific as DBMIB in the inhibition of plastoquinone function.Alkyl substituted /^-nitrophenols, with an additional halogen-or nitro-group at C-2, are shown to be effective electron flow inhibitors. The new potent nitrophenol derivatives inhibit at the site of DCMU action, nevertheless they do not contain the basic chemical element essential for inhibi tion common to DCMU and its many herbicidal analogues. Small changes in the ring-substitution can alter the inhibition pattern from a DCMU typ to a DBMIB typ inhibition.

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Section: Discussionmentioning

confidence: 99%