Browsing by Author "Turkan, Ismail"

Now showing 1 - 13 of 13

Citation - WoS: 7
Citation - Scopus: 6
Alternative electron sinks in chloroplasts and mitochondria of halophytes as a safety valve for controlling ROS production during salinity
(John Wiley and Sons Inc, 2024) Nil Demircan; Mustafa Cemre Sonmez; Turgut Yigit Akyol; Rengin Özgür Uzilday; I. Turkan; Karl Josef Dietz; B. Uzilday; Dietz, Karl-Josef; Uzilday, Baris; Demircan, Nil; Ozgur, Rengin; Turkan, Ismail; Akyol, Turgut Yigit; Sonmez, Mustafa Cemre
Electron flow through the electron transport chain (ETC) is essential for oxidative phosphorylation in mitochondria and photosynthesis in chloroplasts. Electron fluxes depend on environmental parameters e.g. ionic and osmotic conditions and endogenous factors and this may cause severe imbalances. Plants have evolved alternative sinks to balance the reductive load on the electron transport chains in order to avoid overreduction generation of reactive oxygen species (ROS) and to cope with environmental stresses. These sinks act primarily as valves for electron drainage and secondarily as regulators of tolerance-related metabolism utilizing the excess reductive energy. High salinity is an environmental stressor that stimulates the generation of ROS and oxidative stress which affects growth and development by disrupting the redox homeostasis of plants. While glycophytic plants are sensitive to high salinity halophytic plants tolerate grow and reproduce at high salinity. Various studies have examined the ETC systems of glycophytic plants however information about the state and regulation of ETCs in halophytes under non-saline and saline conditions is scarce. This review focuses on alternative electron sinks in chloroplasts and mitochondria of halophytic plants. In cases where information on halophytes is lacking we examined the available knowledge on the relationship between alternative sinks and gradual salinity resilience of glycophytes. To this end transcriptional responses of involved components of photosynthetic and respiratory ETCs were compared between the glycophyte Arabidopsis thaliana and the halophyte Schrenkiella parvula and the time-courses of these transcripts were examined in A. thaliana. The observed regulatory patterns are discussed in the context of reactive molecular species formation in halophytes and glycophytes. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 4
Citation - Scopus: 5
Carnitine modulates antioxidative defense in ABI2 mutant under salt stress
(SPRINGER, 2024) Azime Gokce; Askim Hediye Sekmen Cetinel; Ismail Turkan; Cetinel, Askim Hediye Sekmen; Turkan, Ismail; Sekmen Cetinel, Askim Hediye; Gokce, Azime
Carnitine a ubiquitous compound in living organisms fulfills diverse roles in energy metabolism stress resilience and detoxification. Its antioxidant and osmolyte traits offer relief to stressed plants. Antagonizing abscisic acid (ABA) carnitine influences ABA-responsive genes. Our study using Arabidopsis thaliana wild-type Ler. (Landsberg erecta) and ABA-insensitive abi2-1 mutants explored carnitine's impact on antioxidative responses and ABI2's role in salt-induced carnitine metabolism. The application of 5 mu M carnitine has alleviated the decrease in RWC shoot weight and rosette diameter WT plants caused by 80 mM salt stress for 4 days. Carnitine reduced cell membrane damage and salinity effects evidenced by decreased lipid peroxidation and H2O2. In contrast the impaired ABI2 of abi2-1 due to deficient phosphatase activity further exacerbated the inhibitory effect of carnitine on the enzymes of the ascorbate-glutathione cycle consequently reducing stress mitigation. While abi2-1 mutants exhibited unchanged superoxide dismutase (SOD) activity they demonstrated increased catalase and peroxidase activity following carnitine treatment under salt stress compared to WT plants. Conversely wild-type WT plants treated with carnitine exhibited elevated total glutathione content under salt stress a response not observed in abi2-1 mutants under carnitine treatment. These results underscore the crucial role of ABI2-dependent ABA signaling in regulating plant carnitine metabolism.
Citation - WoS: 4
Citation - Scopus: 4
Deciphering melatonin biosynthesis pathway in Chenopodium quinoa: genome-wide analysis and expression levels of the genes under salt and drought
(SPRINGER, 2025) Seher Yolcu; Ece Fidan; Muhammed Fatih Kaya; Emre Aksoy; Ismail Turkan; Kaya, Muhammed Fatih; Turkan, Ismail; Fidan, Ece; Aksoy, Emre; Yolcu, Seher
Main conclusionIn this study we identified a total of ten melatonin biosynthesis genes (3 TDCs 2 TSHs 3 SNATs and 2 ASMTs) in Chenopodium quinoa through bioinformatics methods and analyzed physiological traits and gene expression levels in drought- and salt-treated plants with or without melatonin. Gene expression levels showed variations depending on tissues genotypes and abiotic stress.AbstractMelatonin is involved in distinct biological processes such as growth development and stress response in plants. The tryptophan decarboxylase (TDC) tryptamine 5-hydroxylase (T5H) serotonin N-acetyltransferase (SNAT) and N-acetylserotonin O-methyltransferase (ASMT) enzymes are involved in melatonin biosynthesis. Exogenous melatonin reduces the adverse effects of salt stress in different plants but the roles of melatonin biosynthesis pathway in quinoa (Chenopodium quinoa) remain elusive. This study aims to identify and characterize the melatonin biosynthetic genes encoding TDCs T5Hs SNATs and ASMTs in C. quinoa genome through bioinformatics methods and determine their transcript abundances under salt and drought stress. In total ten genes were identified in C. quinoa genome including 3 TDCs 2 TSHs 3 SNATs and 2 ASMTs. TDCs have a pyridoxal-dependent decarboxylase domain T5Hs possess a cytochrome P450 SNAT proteins contain the Acetyltransf_1 domain and ASMTs include the O-methyltransferase domain. We also examined some physiological characteristics such as growth and water relations along with electrolyte leakage. For that purpose two quinoa genotypes (Salcedo and Ames 1377) were subjected to salt and drought stress with or without melatonin. Exogenous melatonin remarkably reduced the negative effects of salt and drought on shoot length RWC and electrolyte leakage in the sensitive Salcedo genotype. However it showed limited impact on the stress-tolerant Ames 1377 genotype. Expression patterns showed variations depending on tissues genotypes and the type of abiotic stress. Promoter analysis indicated that the cis-elements in TDC T5H and SNAT promoters were mostly associated with stress-response while those in ASMT promoters were related to light response.
Citation - WoS: 1
Citation - Scopus: 1
Gene expression and mucilage adaptations to salinity in germination of extreme halophyte Schrenkiella parvula seeds
(ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER, 2025) Keriman Sekerci; Nahoko Higashitani; Rengin Ozgur; Atsushi Higashitani; Ismail Turkan; Baris Uzilday; Ozgur, Rengin; Şekerci, Keriman; Turkan, Ismail; Higashitani, Nahoko; Higashitani, Atsushi; Uzilday, Baris
Salinization is a significant global issue causes irreversible damage to plants by reducing osmotic potential inhibiting seed germination and impeding water uptake. Seed germination a crucial step towards the seedling stage is regulated by several hormones and genes with the balance between abscisic acid and gibberellin being the key mechanism that either promotes or inhibits this process. Additionally mucilage a gelatinous substance is known to provide protection against drought herbivory soil adhesion and seed sinking. However limited information is available on the structure and thickness of seed mucilage in halophytes under different salinity conditions. In this study the mucilage structure of the extreme halophyte Schrenkiella parvula was compared with the glycophyte Arabidopsis thaliana in response to salinity. We found differences in the expression levels of genes such as ABI5 RGL2 DOG1 ENO2 and DHAR2 which are involved in seed germination and antioxidant activity as well as in the mucilage structure of seeds of S. parvula and A. thaliana seeds at different salt concentrations. The responses of seed germination of S. parvula to salinity indicate that it is more salt-tolerant than A. thaliana. Additionally it was found that S. parvula mucilage decreased under salt conditions but not under mannitol conditions whereas in A. thaliana mucilage did not change under both conditions which is one of the adaptation strategies of S. parvula to salt conditions. We believe that these fundamental analyzes will provide a foundation for future molecular and biochemical studies comparing the responses of crops and halophytes to salinity stress.
Citation - Scopus: 9
Heavy metal toxicity leads to accumulation of insoluble proteins and induces endoplasmic reticulum stress–specific unfolded protein response in Arabidopsis thaliana
(Springer, 2024) Nil Demircan; Rengin Özgür Uzilday; I. Turkan; B. Uzilday; Ozgur, Rengin; Turkan, Ismail; Uzilday, Baris; Demircan, Nil
Unfolded protein accumulation in the endoplasmic reticulum (ER) triggers ER stress leading to a unique transcriptomic response called unfolded protein response (UPR). While ER stress is linked to various environmental stresses its role in plant responses to heavy metal toxicity remains unclear. This study aimed to elucidate if heavy metals Fe Zn Cu and As induce ER stress in plants. For this purpose Arabidopsis thaliana seedlings were treated with Fe (200 400 µM) Zn (500 700 µM) Cu (25 50 µM) and As (250 500 µM) for 7 days which resulted in 50–70% decrease in plant growth. All treatments increased insoluble protein levels indicating unfolded protein accumulation with the highest induction observed for 50 µM Cu treatment (fivefold). Expressions of genes involved in the perception and signaling of ER stress (IRE1 bZIP28 bZIP60 bZIP17) indicate that Zn toxicity specifically induces bZIP28 but not the IRE1 branch of UPR. All metals except Fe also induced genes associated with protein folding in the ER (BIP1 BIP3 and CNX) and ER-associated protein degradation (ERAD) (HRD1). This finding indicates Zn Cu and As but not Fe cause ER stress in plants. Furthermore increased expression of ER oxidoreductase 1 (ERO1) suggests that metal toxicity also disrupts oxidative protein folding in the ER lumen. This study enhances our understanding of the intricate interplay between essential nutrients metal toxicity protein folding machinery and ER stress demonstrating that heavy metal toxicity has an ER stress component in plants alongside its established effects on energy metabolism membrane integrity and oxidative stress. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 2
Citation - Scopus: 2
Melatonin mediated tolerance to benzalkonium chloride phytotoxicity through improved growth- photochemical reactions- and antioxidant system in wild-type and snat2 mutant Arabidopsis lines
(ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER, 2024) Evren Yildiztugay; Busra Arikan Abdulveli; Ceyda Ozfidan-Konakci; Ismail Turkan; Turkan, Ismail; Yildiztugay, Evren; Arikan Abdulveli, Busra; Abdulveli, Busra Arikan; Ozfidan-Konakci, Ceyda
Melatonin (Mel) is a phytohormone that plays a crucial role in various plant processes including stress response. Despite numerous studies on the role of Mel in stress resistance its significance in plants exposed to benzalkonium chloride (BAC) pollution remains unexplored. BAC a common antiseptic poses a threat to terrestrial plants due to its widespread use and inefficient removal leading to elevated concentrations in the environment. This study investigated the impact of BAC (0.5 mg L-1) pollution on wild-type Col-0 and snat2 knockout mutant Arabidopsis lines revealing reduced growth altered water relations and gas exchange parameters. On the other hand exogenous Mel (100 mu M) treatments mitigated BAC-induced phytotoxicity and increased the growth rate by 1.8-fold in Col-0 and 2-fold in snat2 plants. snat2 mutant seedlings had a suppressed carbon assimilation rate (A) under normal conditions but BAC contamination led to further A repression by 71% and 48% in Col-0 and snat2 leaves respectively. However Mel treatment on stressed plants was successful in improving Fv/Fm and increased the total photosynthesis efficiency by regulating photochemical reactions. Excessive H2O2 accumulation in the guard cells of plants exposed to BAC pollution was detected by confocal microscopy. Mel treatments triggered almost all antioxidant enzyme activities (except POX) in both Arabidopsis lines under stress. This enhanced antioxidant activity facilitated by foliar Mel application contributed to the alleviation of oxidative damage regulation of photosynthesis reactions and promotion of plant growth in Arabidopsis. In addition to corroborating results observed in many agricultural plants regarding the development of tolerance to environmental stresses this study provides novel insights into the action mechanisms of Mel under the emerging pollutant benzalkonium chloride.
Citation - WoS: 5
Citation - Scopus: 5
Proteomic profiling of an extreme halophyte Schrenkiella parvula with accelerated root elongation under mild salt stress.
(Elsevier B.V., 2024) Keriman Şekerci; Nahoko Higashitani; Rengin Özgür Uzilday; B. Uzilday; Atsushi Higashitani; I. Turkan; Ozgur, Rengin; Şekerci, Keriman; Turkan, Ismail; Higashitani, Nahoko; Higashitani, Atsushi; Uzilday, Baris
Increased salinity in soil is one of the impacts of climate change and a major problem for crop cultivation. Halophytes have the ability to survive in hypersaline environments and investigating their adaptation mechanisms is effective in imparting salt tolerance to plants. Recently we discovered a strategy by the extreme halophyte Schrenkiella parvula to promote primary root elongation a morpho-physiological response that may be given to have access to groundwater sources while reducing meristem DNA replication root hair development and biomass at moderate salinities around 100 mM NaCl. However when NaCl concentration exceeds 200 mM seedling root elongation is inhibited and seedlings change to respond to severe stress induced by salinity. To understand the interesting physiological and molecular mechanisms underlying primary root elongation at moderate salinity we performed a proteomic analysis using two-dimensional gel electrophoresis and MALDI-TOF MS. Ultimately a total of 300 different proteins were identified of which 20 showed significant increases and 25 showed significant decreases at 100 mM NaCl. Among the increased proteins proteins responding to abiotic stress such as glutathione transferases were found and among the decreased proteins proteins involved in glycolysis purine nucleotide synthesis and protein synthesis were found. Accumulation levels of proline an osmotic regulator that inhibits root growth were lower in S. parvula than in A. thaliana. On the other hand interestingly the expression levels of fructose-bisphosphate aldolase sucrose phosphatase and α-subunit of acetyl-CoA carboxylase increased. In addition increases in P5CDH an enzyme in the proline catabolism process and decreases in GLN and GDH in glutamate synthesis in S. parvula suggest that these may lead to a fine-tuning of proline content. For annexins a family of calcium-binding and membrane-bound proteins that regulate plant tolerance moderate salt treatment showed a significant decrease in SpANN7 a non-significant downtrend for SpANN2 but no change for SpANN1. These findings suggest that the 100 mM NaCl does not create a serious stress for S. parvula. We also performed gene expression analysis of these altered proteins between S. parvula and A. thaliana. Taken together in S. parvula roots 100 mM NaCl partially induced the redox homeostasis system stress response and proline-mediated osmoregulation moderately suppressing carbon metabolism nucleotide and protein synthesis to accelerate primary root elongation. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 14
Citation - Scopus: 13
Revisiting the Potential of Seed Nutri-Priming to Improve Stress Resilience and Nutritive Value of Cereals in the Context of Current Global Challenges
(Multidisciplinary Digital Publishing Institute (MDPI), 2024) Hayet Houmani; Imen Ben Slimene Debez; I. Turkan; Henda Mahmoudi; Chédly Abdelly; Hans Werner Koyro; Ahmed Debez; Mahmoudi, Henda; Koyro, Hans-Werner; Houmani, Hayet; Ben Slimene Debez, Imen; Turkan, Ismail; Debez, Ahmed; Abdelly, Chedly
Most crop species are cultivated in nutrient-deficient soils in combination with other challenging constraints that are exacerbated by the current climate changes. The significance of micronutrient shortage in stress management is often underappreciated although their deficiency restricts both plant growth and resistance to abiotic stresses and diseases. While the application of nutrients to growing plants is a potential strategy to improve plant resistance to abiotic stresses seed nutrient status may also play a role in crop stress tolerance as a storage and accumulation site of nutrients. To avoid hidden hunger problems developing countries need to increase domestic cereal production enhance their resilience to extreme weather events and improve their nutritional status and quality. Here we analyze the accumulated knowledge about the effects of nutri-priming in cereal crop species with a focus on mechanisms of application and stress tolerance keeping in mind the risk of crop damage mostly caused by global climate change which is driving an alarming increase in the frequency and intensity of abiotic stresses. We also propose new approaches to food production which may be promising solutions for global warming emerging diseases and geopolitical conflicts recognized as major drivers of food insecurity. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 9
Citation - Scopus: 11
Role of Abscisic Acid- Reactive Oxygen Species- and Ca2+ Signaling in Hydrotropism-Drought Avoidance-Associated Response of Roots
(MDPI, 2024) Baris Uzilday; Kaori Takahashi; Akie Kobayashi; Rengin Ozgur Uzilday; Nobuharu Fujii; Hideyuki Takahashi; Ismail Turkan; Fujii, Nobuharu; Uzilday, Baris; Uzilday, Rengin Ozgur; Takahashi, Kaori; Turkan, Ismail; Takahashi, Hideyuki; Kobayashi, Akie
Plant roots exert hydrotropism in response to moisture gradients to avoid drought stress. The regulatory mechanism underlying hydrotropism involves novel regulators such as MIZ1 and GNOM/MIZ2 as well as abscisic acid (ABA) reactive oxygen species (ROS) and Ca2+ signaling. ABA ROS and Ca2+ signaling are also involved in plant responses to drought stress. Although the mechanism of moisture gradient perception remains largely unknown the sensory apparatus has been reported to reside in the root elongation zone rather than in the root cap. In Arabidopsis roots hydrotropism is mediated by the action of MIZ1 and ABA in the cortex of the elongation zone the accumulation of ROS at the root curvature and the variation in the cytosolic Ca2+ concentration in the entire root tip including the root cap and stele of the elongation zone. Moreover root exposure to moisture gradients has been proposed to cause asymmetric ABA distribution or Ca2+ signaling leading to the induction of the hydrotropic response. A comprehensive and detailed analysis of hydrotropism regulators and their signaling network in relation to the tissues required for their function is apparently crucial for understanding the mechanisms unique to root hydrotropism. Here referring to studies on plant responses to drought stress we summarize the recent findings relating to the role of ABA ROS and Ca2+ signaling in hydrotropism discuss their functional sites and plausible networks and raise some questions that need to be answered in future studies.
Role of Sirtuins in Heat Stress Tolerance under Elevated CO2 in Arabidopsis: Photosynthesis, Antioxidant System and Redox Regulation
(Springer, 2026) Alp-Turgut, Fatma Nur; Arikan-Abdulveli, Busra; Turkan, Ismail; Yildiztugay, Evren; Ozfidan-Konakci, Ceyda
Current knowledge about what the protective roles of elevated CO2 concentration (eCO(2)) on chlorophyll fluorescence, PSII photochemistry and antioxidant capacity of Arabidopsis with heat stress remains insufficient. Besides, there is a lack of information on the tolerance mechanism of plants against stress in the presence or absence of sirtuin genes. This study aimed to investigate how eCO(2) (800 ppm) mitigated heat stress (36 degrees C)-dependent oxidative damages through analyzing growth, water content, gas exchange, chlorophyll fluorescence, electron flux efficiency in PSII, antioxidant capacity and lipid peroxidation in Arabidopsis thaliana cv. Columbia-0 (Col-0) and its sirtuin-deficient mutant (srt2) plants. The focus was on investigating the function of the SRT2 gene, particularly in comparison with wild-type plants. Therefore, the sirtuin inhibitor (sirtinol, 1 & micro;M S) was applied to Col-0 plants and the effects of ambient (400 ppm) and eCO(2) heat (H) under stress were also examined. The reductions in growth and water content of heat stress-treated Col-0 and srt2 mutants were eliminated by eCO(2) exposure. The elevated CO2 was removed the reductions on chlorophyll fluorescence, carbon assimilation rate and carboxylation efficiency dependent by H stress in Col-0 plants, but not in srt2 mutants. S supplementation to Col-0 plants produced effects similar to those observed under stress across all measured parameters. While the structural indicators and electron fluxes of PSII and performance indices were disrupted by H stress, eCO(2) provided the positive effects on the photochemistry of PSII in the wild type of Arabidopsis. Interestingly, the eCO(2)-triggered alleviation against stress in srt2 mutants was not maintain. The induced (SOD and GR) and reduced activities (POX, APX, AsA/DHA and GSH redox state) of antioxidant systems point to increased H2O2 accumulation in both Col-0 (123%) and srt2 mutant (40%). Both of the Arabidopsis plants experienced oxidative stress as proved by the high levels of lipid peroxidation. eCO(2) under H stress resulted in remarkable decline in H2O2 accumulation, which contributed to POX and AsA regeneration in Col-0 and POX, AsA and GSH redox status in srt2. Sirtinol application to Col-0 plants also eliminated eCO(2)-mediated protection on TBARS content. This study provides the first evidence of SRT2 involvement in CO2-mediated heat stress tolerance.
Citation - Scopus: 4
Roles of Reactive Carbonyl Species (RCS) in Plant Response to Abiotic Stress
(Humana Press Inc., 2024) Mustafa Cemre Sonmez; Side Selin Su Yirmibesoglu; Rengin Özgür Uzilday; B. Uzilday; I. Turkan; Ozgur, Rengin; Turkan, Ismail; Sonmez, Mustafa Cemre; Yirmibesoglu, Side Selin Su; Uzilday, Baris
Abiotic and biotic stress conditions lead to production of reactive carbonyl species (RCS) which are lipid peroxide derivatives and have detrimental effects on plant cells especially at high concentrations. There are several molecules that can be classified in RCS, among them 4-hydroxy-(E)-2-nonenal (HNE) and acrolein are widely recognized and studied because of their toxicity. The toxicity mechanisms of RCS are well known in animals but their roles in plant systems especially signaling aspects in metabolism need to be addressed. This chapter focuses on the production mechanisms of RCS in plants as well as how plants scavenge and modify them to prevent irreversible damage in the cell. We aimed to get a comprehensive look at the literature to summarize the signaling roles of RCS in plant metabolism and their interaction with other signaling mechanisms such as highly recognized reactive oxygen species (ROS) signaling. Changing climate promotes more severe abiotic stress effects on plants which also decrease yield on the field. The effects of abiotic stress conditions on RCS metabolism are also gathered in this chapter including their signaling roles during abiotic stresses. Different methods of measuring RCS in plants are also presented in this chapter to draw more attention to the study of RCS metabolism in plants. © 2024 Elsevier B.V. All rights reserved.
Citation - WoS: 1
Citation - Scopus: 1
The association between GABA-shunt and circadian rhythm directs salt stress responses in Nicotiana tabaccum L.
(ELSEVIER IRELAND LTD, 2025) Rabia Cakariz; Serife Palabiyik; Tulay Alp Ozturk; Melike Bor; Ismail Turkan; Turkan, Ismail; Ozturk, Tulay Alp; Bor, Melike; Palabiyik, Serife; Cakariz, Rabia
Gamma amino butyric acid (GABA) is a neurotransmitter inhibitor molecule functioning in the central nervous system of mammals found in all the suprachiasmatic nucleus (SCN) and has a critical role in refining circadian rhythm since the SCN sends signals to peripheral clocks for synchronization. GABA may function in plants in a similar way to animals in relation to circadian rhythm. Previously we found that GABA biosynthesis was affected at transcriptional level in Nicotiana tabaccum under drought stress during 24 h periodicity. In the light of these findings we hypothesized that GABA might be an internal cue for circadian rhythm and disruption of this interaction by different stresses might affect phase rhythms in tobacco. We conducted experiments with N. tabaccum plants under salt stress in 72 h periodicity. Physiological parameters along with GABA content GAD and GABA-T activities were measured and the transcript profiles of genes related to the morning central and evening loops of the circadian rhythm were also analyzed. According to our findings under control conditions GABA-shunt was found to be associated with CCA1 PRR7 TOC PRR3 and GI while H2O2 content was negatively correlated with GABA catabolism. Salt stress reversed the daily rhythm of GABA biosynthesis (day and night cycle) as compared to the control plants. The morning and the night/central genes' transcript abundances were impaired during day-night transitions in salt-stressed groups. Moreover under salt stress GABA catabolism was associated more with the morning phase genes and the correlation between GABA-shunt and the circadian rhythm was adversely affected. It is possible that increased H2O2 content under salt stress may also play a regulatory role in this interplay.
The Interaction between Histone Acetylation and Methylation with ROS Metabolism in Plants
(Springer, 2026) Ozgur, Rengin; Turkan, Ismail; Sevim, Gulcin; Keskinoglu, Merve; Gumus, B. Ozlem; Uzilday, Baris
Plants are constantly challenged by various abiotic stresses throught their life cycle and have evolved complex defence systems to ensure survival. Reactive oxygen species (ROS) are generated as byproducts of diverse metabolic pathways, acting not only as damaging molecules but also as essential signaling mediators at basal levels. Recent evidence indicates that enzymes involved in ROS/redox metabolism can influence gene expression by modulating histone modifications, particularly acetylation and methylation. Nevertheless, the precise molecular mechanisms linking ROS dynamics to epigenetic regulation remain poorly understood. This review synthesizes current knowledge on the interplay between ROS metabolism and global histone modifications in plants, highlighting how these interactions shape transcriptional reprogramming under stress conditions. Furthermore, we discuss how this crosstalk contributes to plant defence strategies against abiotic stresses such as drought, salinity, and heavy metal exposure, and we identify emerging questions and future research directions in this rapidly developing field.