Inhibition of photosynthesis by the organochlorine pesticide toxaphene |
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| Affiliation: | 1. MIRACL Laboratory, Faculty of Economics and Management Sfax, BP 3018, Tunisia;2. MIRACL Laboratory, Faculty of Computer Sciences and Information Technologies, Al-Baha University, KSA;3. MIRACL Laboratory, Institute of Computer Science and Multimedia Sfax, BP 3021, Tunisia;1. CSIRO Environment, Hobart 7001, Australia;2. Science Division, Department of Environment and Science, Queensland Government, Brisbane, Australia;3. Office of the Great Barrier Reef, Department of Environment and Science, Brisbane 4102, QLD, Australia |
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| Abstract: | Susceptibility to toxaphene, an extensively used organochlorine pesticide, was evident in five cereal types and was widespread in oat (Avena spp.) and barley (Hordeum spp.). In these cereals most of the varieties tested were susceptible, this being assessed biochemically from inhibition of the Hill reaction in chloroplasts from treated plants. Studies with the susceptible Avena sativa variety Blyth showed two sites of inhibition ofphotosynthetic electron flow. The first site was on the oxidizing side of photosystem 2, and the second in the intermediate electron transport chain between the two photosystems. As a consequence of the latter, cyclic photophosphorylation was inhibited and toxaphene may additionally have some uncoupler activity. |
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