Reactive oxygen species, oxidative signaling and the regulation of photosynthesis

Foyer, Christine H.

doi:10.1016/j.envexpbot.2018.05.003

Cited by 600 publications

(389 citation statements)

References 113 publications

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“…This was in the context of other arguments against the need for flavonoids as UVB-screens, such as the effective UVB-screening properties of non-flavonoid phenylpropanoids like the hydroxycinnamic acids (HCAs). More recently, arguments for the early functions of flavonoids being other than UVBscreening have been extended by discoveries on their antioxidant properties and possible signaling actions through the redox pathway or by affecting H 2 O 2 retrograde signals between the chloroplast and nucleus (Taylor and Grotewold, 2005;Agati and Tattini, 2010;Pollastri and Tattini, 2011;Agati et al, 2012;Brunetti et al, 2018;Foyer, 2018;Muhlemann et al, 2018;Brunetti et al, 2019).…”

Section: Origins and Vegetative Functions Of The Flavonoid Pathwaymentioning

confidence: 99%

“…Further complicating the development of a unifying theory for anthocyanin abiotic stress function are alternative hypotheses that involve neither light screening nor ROS scavenging, such as drought tolerance through decreased osmotic potential, increasing light absorption to help warm leaves, providing camouflage against insect herbivores, "honest" signaling to herbivores that leaves contain antifeedant compounds and/or are about to be shed, and making leaves more noticeable to insect predators (anti-crypsis) (Gould et al, 1995;Lee and Gould, 2002;Manetas, 2006;Archetti, 2009;Hughes, 2011;Agati et al, 2012;Landi et al, 2015;Davies et al, 2018). Additionally, as mentioned earlier, there is also evidence supporting flavonoid roles as signaling molecules (Taylor and Grotewold, 2005;Agati and Tattini, 2010;Agati et al, 2012;Foyer, 2018).…”

Section: Pigmented Flavonoids and Tolerance To Abiotic Stressmentioning

confidence: 99%

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The Evolution of Flavonoid Biosynthesis: A Bryophyte Perspective

et al. 2020

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The flavonoid pathway is one of the best characterized specialized metabolite pathways of plants. In angiosperms, the flavonoids have varied roles in assisting with tolerance to abiotic stress and are also key for signaling to pollinators and seed dispersal agents. The pathway is thought to be specific to land plants and to have arisen during the period of land colonization around 550-470 million years ago. In this review we consider current knowledge of the flavonoid pathway in the bryophytes, consisting of the liverworts, hornworts, and mosses. The pathway is less characterized for bryophytes than angiosperms, and the first genetic and molecular studies on bryophytes are finding both commonalities and significant differences in flavonoid biosynthesis and pathway regulation between angiosperms and bryophytes. This includes biosynthetic pathway branches specific to each plant group and the apparent complete absence of flavonoids from the hornworts.

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Section: Origins and Vegetative Functions Of The Flavonoid Pathwaymentioning

confidence: 99%

Section: Pigmented Flavonoids and Tolerance To Abiotic Stressmentioning

confidence: 99%

The Evolution of Flavonoid Biosynthesis: A Bryophyte Perspective

et al. 2020

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“…Such ‘excess' energy can trigger the formation of toxic side products (i.e. ROS) by the primary photochemical reactions in thylakoid membranes (Foyer, ). Plants evolved a battery of photoprotective mechanisms to minimize or manage ROS stress ranging from whole plant responses (e.g.…”

Section: Membranes In Motion: the Dynamic Thylakoid Architecturementioning

confidence: 99%

Chloroplast ultrastructure in plants

Kirchhoff

2019

New Phytologist

146

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Summary The chloroplast organelle in mesophyll cells of higher plants represents a sunlight‐driven metabolic factory that eventually fuels life on our planet. Knowledge of the ultrastructure and the dynamics of this unique organelle is essential to understanding its function in an ever‐changing and challenging environment. Recent technological developments promise unprecedented insights into chloroplast architecture and its functionality. The review highlights these new methodical approaches and provides structural models based on recent findings about the plasticity of the thylakoid membrane system in response to different light regimes. Furthermore, the potential role of the lipid droplets plastoglobuli is discussed. It is emphasized that detailed structural insights are necessary on different levels ranging from molecules to entire membrane systems for a holistic understanding of chloroplast function.

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“…This communication is achieved, in part, by the ROS themselves. Although ROS can lead to oxidative damage of proteins, lipids, and metabolites, they can also act as signaling molecules leading to chloroplast degradation, cell death, or changes in nuclear gene expression (Foyer 2018). Therefore, it appears chloroplast ROS can play two roles; as a stress signal to prepare a cell for oxidative damage and as information about the changing external environment to allow the cell (and plant) make the necessary biochemical and physiological changes to maintain efficient photosynthesis and to survive.…”

Section: Introductionmentioning

confidence: 99%

Plastid gene expression is required for singlet oxygen-induced chloroplast degradation and cell death

Alamdari

Fisher

Sinson

et al. 2020

Preprint

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Running head: Plastid gene expression and cellular degradationSignificance summary: Reactive oxygen species accumulate in the chloroplast (photosynthetic plastids) and signal for stress acclimation by inducing chloroplast degradation, cell death, and changes in nuclear gene expression. We have identified two chloroplast-localized proteins involved in gene regulation that are required to transmit these signals, suggesting that proper plastid gene expression and chloroplast development is necessary to activate chloroplast controlled cellular degradation and nuclear gene expression pathways. Summary:Chloroplasts constantly experience photo-oxidative stress while performing photosynthesis. This is particularly true under abiotic stresses that lead to the accumulation of reactive oxygen species (ROS). While ROS leads to the oxidation of DNA, proteins, and lipids, it can also act as a signal to induce acclimation through chloroplast degradation, cell death, and nuclear gene expression. Although the mechanisms behind ROS signaling from chloroplasts remain mostly unknown, several genetic systems have been devised in the model plant Arabidopsis to understand their signaling properties. One system uses the plastid ferrochelatase two (fc2) mutant that conditionally accumulates the ROS singlet oxygen ( 1 O2) leading to chloroplast degradation and eventually cell death. Here we have mapped three mutations that suppress chloroplast degradation in the fc2 mutant and demonstrate that they affect two independent loci (PPR30 and mTERF9) encoding chloroplast proteins predicted to be involved in posttranscriptional gene expression. Mutations in either gene were shown to lead to broadly reduced chloroplast gene expression, impaired chloroplast development, and reduced chloroplast stress signaling. In these mutants, however, 1 O2 levels were uncoupled to chloroplast degradation suggesting that PPR30 and mTERF9 are involved in ROS signaling pathways. In the wild type background, ppr30 and mTERF9 mutants were also observed to be less susceptible to cell death induced by excess light stress. Together these results suggest that plastid gene expression (or the expression of specific plastid genes) is a necessary prerequisite for chloroplasts to activate 1 O2 signaling pathways to induce chloroplast degradation and/or cell death.

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Reactive oxygen species, oxidative signaling and the regulation of photosynthesis

Cited by 600 publications

References 113 publications

The Evolution of Flavonoid Biosynthesis: A Bryophyte Perspective

The Evolution of Flavonoid Biosynthesis: A Bryophyte Perspective

Chloroplast ultrastructure in plants

Plastid gene expression is required for singlet oxygen-induced chloroplast degradation and cell death

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