Herbicides of photosystem II

Oettmeier, Walter

doi:10.1016/b978-0-444-89440-3.50018-7

Cited by 61 publications

(50 citation statements)

References 203 publications

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“…These herbicides compete with plastoquinone for the Q B binding site on the D1 protein in PSII, leading to reduced electron transport (photochemical efficiency) and a consequent increase in nonphotochemical quenching and a decrease in DF : F 9 m (Oettmeier 1992;Jones and Kerswell 2003). While the effects of herbicides on DF : F 9 m within corals and CCA are largely reversible (Jones and Kerswell 2003;Harrington et al 2005;Negri et al 2005), the inhibition of DF : F 9 m observed for corals and CCA at temperatures over 30uC may reflect chronic thermal damage to the D1 protein because they correspond well with distinct reductions in F v : F m (see below).…”

Section: Discussionmentioning

confidence: 99%

Herbicides increase the vulnerability of corals to rising sea surface temperature

Negri

Flores

Röthig

et al. 2011

Limnology & Oceanography

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In order to examine the potential interactive pressures of local pollution and global climate change, we exposed corals and crustose coralline algae (CCA) to three agricultural photosystem II (PSII) herbicides at four temperatures (26-32uC). The coral Acropora millepora was 3-to 10-fold more sensitive to the three herbicides than the CCA Neogoniolithon fosliei. While the photosynthesis of CCA was not affected by the herbicide concentrations used (, 1 mg L 21 ), temperatures of 31uC and 32uC alone significantly inhibited photosynthetic efficiency (DF : F 9 m ) and caused chronic photoinhibition (reduced F v : F m ) and substantial bleaching. Environmentally relevant concentrations of each herbicide increased the negative effects of thermal stress on coral at 31uC and 32uC. Mixed model analyses of variance showed that the effects of elevated sea surface temperatures (SST) and herbicide on photosynthetic efficiency of coral symbionts were additive. Furthermore, the effect of either diuron or atrazine in combination with higher SST (31uC and 32uC) on chronic photoinhibition was distinctly greater than additive (synergistic). Reducing the herbicide concentration by 1 mg L 21 diuron above 30uC would protect photosynthetic efficiency by the equivalent of 1.8uC and reduce chronic photoinhibition by the equivalent of a 1uC reduction. Reduced water quality increases the vulnerability of corals to elevated SSTs, and effective management of local water quality can reduce negative effects of global stressors such as elevated SST.

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Section: Discussionmentioning

confidence: 99%

Herbicides increase the vulnerability of corals to rising sea surface temperature

Negri

Flores

Röthig

et al. 2011

Limnology & Oceanography

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“…Their mode of action is associated with competition with plastoquinone for the Q B binding site (niche) of photosynthesis on the D1 or 'herbicide-binding' protein (for a review on Photosystem [PS] II herbicides see Oettmeier 1992, see also Jones et al 2003). When temporarily bound, herbicides disrupt photosynthetic electron flow, and in illuminated samples excitation energy is lost as fluorescence as opposed to being trapped by ABSTRACT: Recent reports of contamination of the Great Barrier Reef Marine Park by herbicides used in antifouling paints and in agriculture have caused concern over the possible effects on corals in nearshore areas.…”

Section: Introductionmentioning

confidence: 99%

Phytotoxicity of Photosystem II (PSII) herbicides to coral

Jones¹,

Kerswell²

2003

Mar. Ecol. Prog. Ser.

159

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“…These characteristics were in good agreement with reported observations for the other s-triazine herbicide resistant plant species having resistance due to insensitive D 1 protein, suggesting that the molecular basis of resistance in the R biotype P. annua is due to a change in the D 1 protein. 25) …”

Section: Differences In Sensitivity Of Ps II In Isolatedmentioning

confidence: 99%

Molecular Basis of Resistance to <i>s</i>-Triazine Herbicides in <i>Poa annua</i> L. and Its Photosynthetic Properties under Different Light Conditions

et al. 2001

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A simazine resistant biotype of Poa annua L. was found in a golf course in Shizuoka prefecture, Japan. The biotype was highly resistant to s-triazines, almost equally susceptible to the phenylurea, diuron, and more susceptible to the phenol, dinoseb, than the susceptible biotype both at whole plant and at isolated thylakoid levels. The molecular basis of resistance to s-triazine herbicides in the resistant biotype was identified as a mutation in psbA gene giving rise to the replacement of serine 264 by glycine in the D 1 protein of photosystem II (PS II). The resistant biotype showed a reduced capacity of photosynthesis when grown under full-sunlight conditions. However, no differences were observed in photosynthetic performance of susceptible and resistant biotypes when grown under shaded conditions. The resistant biotype also showed increased sensitivity to photoinhibition both at whole plant and at isolated PS II membrane levels, indicating that the increased susceptibility in the resistant biotype to the photoinhibition is due to the substitution of serine 264 to glycine in the D 1 protein.

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Herbicides of photosystem II

Cited by 61 publications

References 203 publications

Herbicides increase the vulnerability of corals to rising sea surface temperature

Herbicides increase the vulnerability of corals to rising sea surface temperature

Phytotoxicity of Photosystem II (PSII) herbicides to coral

Molecular Basis of Resistance to <i>s</i>-Triazine Herbicides in <i>Poa annua</i> L. and Its Photosynthetic Properties under Different Light Conditions

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