Redox and the circadian clock in plant immunity: A balancing act

Karapetyan, Sargis; Dong, Xinnian

doi:10.1016/j.freeradbiomed.2017.12.024

Cited by 58 publications

(55 citation statements)

References 87 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2017; Karapetyan & Dong, 2018). As a redox-sensitive immune regulator, NPR1 links changes in cellular redox states to immune activation and also clock regulation under light-dark cycling.…”

Section: Circadian Clockmentioning

confidence: 99%

Plant immunity in signal integration between biotic and abiotic stress responses

2019

View full text Add to dashboard Cite

Summary Plants constantly monitor and cope with the fluctuating environment while hosting a diversity of plant‐inhabiting microbes. The mode and outcome of plant–microbe interactions, including plant disease epidemics, are dynamically and profoundly influenced by abiotic factors, such as light, temperature, water and nutrients. Plants also utilize associations with beneficial microbes during adaptation to adverse conditions. Elucidation of the molecular bases for the plant–microbe–environment interactions is therefore of fundamental importance in the plant sciences. Following advances into individual stress signaling pathways, recent studies are beginning to reveal molecular intersections between biotic and abiotic stress responses and regulatory principles in combined stress responses. We outline mechanisms underlying environmental modulation of plant immunity and emerging roles for immune regulators in abiotic stress tolerance. Furthermore, we discuss how plants coordinate conflicting demands when exposed to combinations of different stresses, with attention to a possible determinant that links initial stress response to broad‐spectrum stress tolerance or prioritization of specific stress tolerance.

show abstract

“…2017; Karapetyan & Dong, 2018). As a redox-sensitive immune regulator, NPR1 links changes in cellular redox states to immune activation and also clock regulation under light-dark cycling.…”

Section: Circadian Clockmentioning

confidence: 99%

Plant immunity in signal integration between biotic and abiotic stress responses

2019

View full text Add to dashboard Cite

show abstract

“…Our results also demonstrated that CHT significantly caused stomatal closure before dark/light transition only if the elicitor treatment was carried out in the previous light phase of the day (at 17:00 hrs). This response of plants upon CHT treatment could be substantial, because stomata must be opened at dawn (dark/light transition) to facilitate photosynthetic CO 2 assimilation but they provide also infection window for some pathogens [21]. Not only the dark/light transition but also the first part of the light period can influence and determine the plant defence responses in different ways.…”

Section: Daytime and Light Dependency Of Stomatal Responsementioning

confidence: 99%

“…In the morning, the core circadian clock component CCA1 regulates the expression of several defence genes, such as catalases to manage ROS homeostasis and to affect defence responses through redox changes [40]. At 09:00 hrs, when the expression of defence genes shows a peak [21], stomata were closed in case of leaves treated in the morning (at 08:00 hrs) and at dawn (at 04:00 hrs).…”

Section: Daytime and Light Dependency Of Stomatal Responsementioning

confidence: 99%

“…Thus, plants can be subjected to a greater challenge by many fungal pathogens at night than during the day [3]. Although stomata are closed at night and provide the first line of defence in the dark, at dawn stomata start to open thus provide infection window for many pathogens [21]. Decreased susceptibility to Botrytis cinerea was observed in Arabidopsis thaliana after inoculation at dawn compared with the night [22].…”

mentioning

confidence: 99%

See 1 more Smart Citation

Effects of Light and Daytime on the Regulation of Chitosan-Induced Stomatal Responses and Defence in Tomato Plants

Czékus

Poór

Tari

et al. 2020

Plants

View full text Add to dashboard Cite

Closure of stomata upon pathogenesis is among the earliest plant immune responses. However, our knowledge is very limited about the dependency of plant defence responses to chitosan (CHT) on external factors (e.g., time of the day, presence, or absence of light) in intact plants. CHT induced stomatal closure before dark/light transition in leaves treated at 17:00 hrs and stomata were closed at 09:00 hrs in plants treated at dawn and in the morning. CHT was able to induce generation of reactive oxygen species (ROS) in guard cells in the first part of the light phase, but significant nitric oxide production was observable only at 15:00 hrs. The actual quantum yield of PSII electron transport (Φ PSII ) decreased upon CHT treatments at 09:00 hrs in guard cells but it declined only at dawn in mesophyll cells after the treatment at 17:00 hrs. Expression of Pathogenesis-related 1 (PR1) and Ethylene Response Factor 1 were already increased at dawn in the CHT-treated leaves but PR1 expression was inhibited in the dark. CHT-induced systemic response was also observed in the distal leaves of CHT-treated ones. Our results suggest a delayed and daytime-dependent defence response of tomato plants after CHT treatment at night and under darkness.Plants 2020, 9, 59 2 of 21 the day, which in turn regulates stomatal aperture and thereby stomatal defence against Pseudomonas syringae in Arabidopsis thaliana [14]. Another component involved in the clock-regulated stomata-based pre-invasive defence is the time for coffee (TIC), a night-expressed clock gene. TIC inhibits JA signalling in the evening and contributes to a stronger JA responsiveness in the morning [15,16]. Thus, both the daytime and/or the presence or absence of light seem to be crucial factor in the phytohormone-mediated response of plants against various pathogens.It can be concluded that diurnal effects of light can significantly influence plant-pathogen interactions. It is well known that light can directly inhibit spore germination, germ tube growth, and reduces the infection efficiency of many pathogenic fungi, such as Botrytis cinerea [17], Fusarium graminearum [18], Phakopsora pachyrhizi [19], and Puccinia hemerocallidis [20]. Thus, plants can be subjected to a greater challenge by many fungal pathogens at night than during the day [3]. Although stomata are closed at night and provide the first line of defence in the dark, at dawn stomata start to open thus provide infection window for many pathogens [21]. Decreased susceptibility to Botrytis cinerea was observed in Arabidopsis thaliana after inoculation at dawn compared with the night [22]. Besides rapid production of ROS and RNS at the infection sites, the initiation of the biosynthesis of SA and JA and increased expression of pathogenesis-related (PR) genes were also induced, which resulted in the hypersensitive response (HR). The localized contact with pathogens can further activate systemic acquired resistance (SAR) even at the whole plant level, which can protect the infected plant against the subsequent path...

show abstract

“…Within these cycles, light causes the accumulation of reactive oxygen species (ROS) (Pitzschke et al, 2006), while pathogen invasion is often favored at a given time of day (Shin et al, 2012;Korneli et al, 2014;Karapetyan and Dong, 2018;Li et al, 2018;Zhang et al, 2019). These perturbations often elicit various types of oxidative bursts (Karapetyan and Dong, 2018;Zhang et al, 2019). Given the predictable, timed nature of these abiotic and biotic stressors, the plant circadian clock provides timed sensitivity resistance to such agents.…”

Section: Introductionmentioning

confidence: 99%

Chemical Perturbation of Chloroplast-Related Processes Affects Circadian Rhythms of Gene Expression in Arabidopsis: Salicylic Acid Application Can Entrain the Clock

Philippou

Davis

et al. 2020

Front. Physiol.

View full text Add to dashboard Cite

The plant circadian system reciprocally interacts with metabolic processes. To investigate entrainment features in metabolic-circadian interactions, we used a chemical approach to perturb metabolism and monitored the pace of nuclear-driven circadian oscillations. We found that chemicals that alter chloroplast-related functions modified the circadian rhythms. Both vitamin C and paraquat altered the circadian period in a light-quality-dependent manner, whereas rifampicin lengthened the circadian period under darkness. Salicylic acid (SA) increased oscillatory robustness and shortened the period. The latter was attenuated by sucrose addition and was also gated, taking place during the first 3 h of the subjective day. Furthermore, the effect of SA on period length was dependent on light quality and genotype. Period lengthening or shortening by these chemicals was correlated to their inferred impact on photosynthetic electron transport activity and the redox state of plastoquinone (PQ). Based on these data and on previous publications on circadian effects that alter the redox state of PQ, we propose that the photosynthetic electron transport and the redox state of PQ participate in circadian periodicity. Moreover, coupling between chloroplast-derived signals and nuclear oscillations, as observed in our chemical and genetic assays, produces traits that are predicted by previous models. SA signaling or a related process forms a rhythmic input loop to drive robust nuclear oscillations in the context predicted by the zeitnehmer model, which was previously developed for Neurospora. We further discuss the possibility that electron transport chains (ETCs) are part of this mechanism.

show abstract

Redox and the circadian clock in plant immunity: A balancing act

Cited by 58 publications

References 87 publications

Plant immunity in signal integration between biotic and abiotic stress responses

Plant immunity in signal integration between biotic and abiotic stress responses

Effects of Light and Daytime on the Regulation of Chitosan-Induced Stomatal Responses and Defence in Tomato Plants

Chemical Perturbation of Chloroplast-Related Processes Affects Circadian Rhythms of Gene Expression in Arabidopsis: Salicylic Acid Application Can Entrain the Clock

Contact Info

Product

Resources

About