We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Effect of some substituted benzonitriles on photosynthetic activity of spinach and wheat in vivo and in vitro.
- Authors
Szigeti, Zoltán; Sárvári, Éva; Bujtás, Claire
- Abstract
The inhibitory effects of nine nitro and/or bromo-substituted benzonitrile compounds on the photosynthetic electron flow in isolated chloroplasts and on the <em>in vivo</em> CO2 fixation of spinach (<em>Spinacia oleracea</em> L.) and wheat (<em>Triticum aestivum</em> L. cv. Bezostaya) were investigated. Bromoxynil and 3-nitro-5-bromo-4-hydroxy-benzonitrite were the strongest and equally effective inhibitors of the <em>in vivo</em> CO2 fixation of spinach, but in wheal the nitro-bromo-compound is ineffective and 3-nitro-benzonitrile is even more inhibitory than bromoxynil. None of the substances affected DCPIPH→methylviologen reduction. In the inhibition of the DCPIP reduction only the 3,5-disubstituted 4-hydroxy-derivatives were effective. The fact that these compounds affect only the PS II reaction with both H2O and DPC as electron donors suggests a site of inhibition or, the reducing side of PS II, between the PS II reaction centre and the DCPIP site. It is suggested that in the inhibition of the DCPIP reduction only steric factors are important and the different electron configuration of the sterically similar molecules may be involved only in the absorption and translocation processes of the compounds.
- Subjects
SPINACH; SPINACIA; WHEAT; GRAIN; ELECTRON configuration
- Publication
Weed Research, 1981, Vol 21, Issue 1, p37
- ISSN
0043-1737
- Publication type
Article
- DOI
10.1111/j.1365-3180.1981.tb00094.x