Anthraquinone inhibitors of photosystem II electron transport

Oettmeier, Walter; Masson, Klaus; Donner, A.

doi:10.1016/0014-5793(88)80743-9

Cited by 33 publications

(13 citation statements)

References 17 publications

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“…Juglone's mode of toxic action could involve mixed mechanisms including electrophilic reactivity of its quinoidal and phenolic functionalities (Table 1) toward cellular nucleophiles (e.g., alcohol, thiol, and amino groups) and an ability to undergo oxidation–reduction cycles between oxidized quinones, partially reduced semiquinones, and fully reduced phenols (O'Brien, 1991; Rath et al, 1996). The redox‐active nature of juglone's functional groups provides properties known to disrupt physiologically important electron transfer chains in plants (Oettmeier et al, 1988).…”

Section: Molecular Properties Of Juglone (5‐hydroxy‐14‐naphthoquinone)mentioning

confidence: 99%

Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

2007

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Juglone (5-hydroxy-1,4-napthoquinone) is a chemical released by walnut trees, which can be toxic at various levels to several plant species. A balance among competing source and sink mechanisms and rates will ultimately determine whether juglone is capable of attaining sufficient levels to be allelopathic to intercrops in a walnut tree agroforestry system. In this study, juglone's release, accumulation, and decline in soil are explored using data from soil beneath a black walnut tree (Juglans nigra L) alley cropping system, greenhouse pot studies, and laboratory sorption/degradation studies. Juglone pore water concentrations estimated from extracts of surficial soil from beneath the alley cropping system exceeded the lowest solution culture toxicity levels reported for some plants of 10(-7) M, but did not exceed the inhibition threshold reported for typical intercrops such as maize and soybeans 10(-5) M. Further assessment of the likely persistence of juglone in soils indicated that juglone is both microbially and abiotically degraded, and that it will be particularly short-lived in soils supporting microbial activity. However, walnut seedlings planted in sand-filled pots clearly showed that juglone is released in measurable quantities to the soil's rhizosphere. Therefore, juglone accumulation in low fertility soils is plausible, and may still be worthy of consideration in management of alley agroforestry systems.

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Section: Molecular Properties Of Juglone (5‐hydroxy‐14‐naphthoquinone)mentioning

confidence: 99%

Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

2007

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“…Polycyclic aromatic hydrocarbons (PAHs) are a class of ubiquitous environmental contaminants for which toxicity is substantially enhanced by absorption of light, especially ultraviolet (UV) radiation (Oris and Giesy, 1985;Huang et al, 1993;Ankley et al, 1994;Arfsten et al, 1996;McConkey et al, 1997). The acute toxic mode of action of PAHs has generally been attributed to light-mediated production of destructive singlet oxygen, peroxides, and hydroxyl radicals in the membranes of the organism following uptake into the tissue.…”

Section: Introductionmentioning

confidence: 99%

Intact and Photomodified Polycyclic Aromatic Hydrocarbons Inhibit Photosynthesis in Natural Assemblages of Lake Erie Phytoplankton Exposed to Solar Radiation

Marwood

Smith

Solomon

et al. 1999

Ecotoxicology and Environmental Safety

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“…For instance, 2,5-dibromo-3-methyl-6-isopropyl-p-benzoquinone (DBMIB), a plastoquinone analog, is a classical inhibitor of the cytochrome b 6 /f complex in the photosynthetic electron transport chain (Izawa, 1977;Trebst, 1980). But also herbicide-like actions on the Q B site of PSII by 1,4 benzoquinones, -naphthoquinones and anthraquinones have been described (Oettmeier et al, 1987(Oettmeier et al, , 1988. However, at relatively high-concentrations (10-20 lM), DBMIB acts as a PSII electron acceptor (Izawa et al, 1973).…”

Section: Discussionmentioning

confidence: 98%

Selected coccal green algae are not affected by the humic substance Huminfeed® in term of growth or photosynthetic performance

et al. 2012

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Humic substances (HSs) have been shown to influence growth, photophysiology, and redox homeostasis in phototrophs. However, many ecological studies deliver controversial results indicating inhibitory or stimulating effects depending on the kind of phototrophic organism or type of HSs applied. Here we analyzed the effect of Huminfeed Ò (HF), a preparation from leonardite associated with lignite deposits, on growth and photosynthetic performance of three different coccal green algae. Concentrations of HF in the range of 2-20 mg l -1 dissolved organic carbon (DOC) did neither affect the growth rate nor the light-adapted photosynthetic electron transport. Even photoinhibitory light intensities of 1,600 lmol photons m -2 s -1 , representing the tenfold of growth light intensity, did not result in a decline of the maximal photosynthetic rate in HF-treated algae. In HF-grown algae, a very subtle decrease by about 10% could be observed in thermoluminescent light emission, a sensitive method to detect changes in photosystem II (PSII) chemistry. However, thermoluminescence (TL) represents only 3% of the light-induced charge separated states in PSII. Hence, rather small changes will not have significant effects on overall photosynthetic performance and growth. Therefore, the physiological effect of HSs on freshwater phototrophs has to be revisited.

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Anthraquinone inhibitors of photosystem II electron transport

Cited by 33 publications

References 17 publications

Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

Occurrence and Fate of the Phytotoxin Juglone in Alley Soils under Black Walnut Trees

Intact and Photomodified Polycyclic Aromatic Hydrocarbons Inhibit Photosynthesis in Natural Assemblages of Lake Erie Phytoplankton Exposed to Solar Radiation

Selected coccal green algae are not affected by the humic substance Huminfeed® in term of growth or photosynthetic performance

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