Tae-Hwan Kim

Chonnam National University · Department of Animal Science

The effects of intense heat during the reproductive phase of two Brassica species—B. napus and C. sativa—could be alleviated by a prior gradual increase exposure and/or PGPR inoculation. Abct. Among extreme weather events caused by climate change, heat waves are one of the most threatening issues for food security. Heat stress is known to be partic...

Pathogen-responsive immune-related genes (resistance genes [R-genes]) and hormones are crucial mediators of systemic acquired resistance (SAR). However, their integrated functions in regulating SAR signaling components in local and distal leaves remain largely unknown. To characterize SAR in the Xanthomonas campestris pv. campestris (Xcc)–Brassica...

Oilseed rape ( Brassica napus L.) is a significant agro‐economic crop with a wide range of uses. Drought is the most frequent unfavourable environmental stressor restraining its growth and development worldwide. This study was conducted to characterize the drought‐responsive phenylpropanoid pathway and its link to hormonal changes in two cultivars,...

In nature, plants constantly interact with both abiotic and biotic environments. Recent studies have often converged on plant-stress interactions by modulating and eliciting precise signals. Advances in molecular techniques and mining of big datasets have increased our understanding of these processes, revealed new levels of complexity, and opened...

This study aimed to characterize the drought priming effects on the interactive regulation of oxidative burst signaling and hormones in the glutathione (GSH) pathway and GSH-based redox control during the subsequent drought period. Plants were exposed to mild drought for 7 days, re-watered for 12 days, and subjected to subsequent drought stress for...

Drought intensity modifies the assimilatory pathway of glutathione (GSH) synthesis. Abscisic acid (ABA) is a representative signaling hormone involved in regulating plant stress responses. This study aimed to investigate an interactive regulation of sulfate and/or ABA in GSH metabolism and redox. The drought-responsive alterations in sulfate assimi...

In plants, prolonged drought induces oxidative stress, leading to a loss of reducing potential in redox components. Abscisic acid (ABA) is a representative hormonal signal regulating stress responses. This study aimed to investigate the physiological significance of dimethylthiourea (DMTU, an H2O2 scavenger) in the hormonal regulation of the antiox...

Oilseed rape (Brassica napus L.) is an economically important crop for production of oil and livestock feed. Drought stress is the most destructive abiotic stress that limits the production of oilseed plants. Phytohormones and reactive oxygen species (ROS) signaling are crucial under drought stress. Drought priming could induce short-term stress me...

Sulfur is an essential element in plants, including amino acids, vitamin synthesis, and acting as an antioxidant. However, theinteraction between endogenous sulfur and proline synthesis has not been yet fully documented. White clover (Trifolium repens L.) isknown as a species highly sensitive to sulfate supply. Therefore, this study aimed to elucid...

Drought alters the level of endogenous reactive oxygen species (ROS) and hormonal status, which are both involved in the regulation of stress responses. To investigate the interplay between ROS and hormones in proline metabolism, rapeseed (Brassica napus L.) plants were exposed to drought or exogenous H2O2 (Exo-H2O2) treatment for 10 days. During t...

Many studies point out the deleterious effect of high temperatures during the crop reproductive stages on seed yield and quality. However, the response of plants to repeated stressing events across plant generations remains poorly investigated, especially in a context of climate change characterized by increased interseasonal variability frequency...

To characterize cultivar variations in hormonal regulation of the transition between pattern-triggered immunity (PTI) and effector-triggered immunity or susceptibility (ETI or ETS), the responses of resistance (R-) genes, hydrogen peroxide, and proline metabolism in two Brassica napus cultivars to contrasting disease susceptibility (resistant cv. C...

To investigate the regulatory role of ethylene in the source-sink relationship for nitrogen remobilization, short-term effects of treatment with different concentrations (0, 25, 50, and 75 ppm) of ethephon (2-chloroethylphosphonic acid, an ethylene inducing agent) for 10 days (EXP 1) and long-term effects at 20 days (Day 30) after treatment with 10...

The leaf senescence process is characterized by the degradation of macromolecules in mature leaves and the remobilization of degradation products via phloem transport. The phytohormone ethylene mediates leaf senescence. This study aimed to investigate the ethephon-induced ethylene effects on starch degradation and sucrose remobilization through the...

Objective: The present study was conducted to assess the effect of urease inhibitor (hydroquinone, HQ) and nitrification inhibitor (dicyandiamide, DCD) on nitrogen (N) use efficiency of pig slurry for perennial ryegrass regrowth yield and its environmental impacts. Methods: A micro-plot experiment was conducted using pig slurry-urea 15N treated...

Citation: Park, S.-H.; Lee, B.-R.; La, V.H.; Mamun, M.A.; Bae, D.-W.; Kim, T.-H. Drought Intensity-Responsive Salicylic Acid and Abscisic Acid Crosstalk with the Sugar Signaling and Metabolic Pathway in Brassica napus. Plants 2021, 10, 610. https://

Drought modifies the endogenous hormonal status, which is involved in the regulation of stress responses and tolerance. This study aimed to characterize the drought-responsive hormone-mediated regulation of stress responses based on the time-course of drought intensity. Alterations in H2O2, Ca²⁺ and their signaling genes with decreasing leaf water...

Black rot, caused by Xanthomonas campestris pv. campestris (Xcc), is the main disease of cruciferous vegetables. To characterize the resistance mechanism in the Brassica napus–Xccpathosystem, Xcc-responsive proteins in susceptible (cv. Mosa) and resistant (cv. Capitol) cultivars were investigated using gel-free quantitative proteomics and analysis...

High temperatures during the crop reproductive stage impact seed yield and quality. The changing climate will require consideration of the effects of high temperature events that differ from their intensity, their duration and their frequency over the seed quality-building stages. The impact of these features deserve to be investigated at the light...

To characterize the hormonal regulations in the transition between biotrophic and necrotrophic phases of Xanthomonas campestris pv. campestris (Xcc) infection, the endogenous phytohormone and reactive oxygen species (ROS) levels and glutathione (GSH) redox status of non-inoculated and Xcc-infected Brassica napus cv. Mosa leaves were measured at var...

To manage nutrient deficiencies, plants develop both morphological and physiological responses. The studies on the regulation of these responses are limited; however, certain hormones and signaling components have been largely implicated. Several studies depicted ethylene as a regulator of the response of some nutrient deficiencies like iron, phosp...

Proline metabolism influences the metabolic and/or signaling pathway in regulating plant stress responses. This study aimed to characterize the physiological significance of glutamate (Glu)-mediated proline metabolism in the drought stress responses, focusing on the hormonal regulatory pathway. The responses of cytosolic Ca 2+ signaling, proline me...

To characterize cultivar variation in resistance gene (R-gene)-mediated calcium signaling and hormonal regulation in effector-triggered immunity (ETI) and disease susceptibility, Xanthomonas campestris pv. campestris (Xcc) was inoculated in two Brassica napus cultivars (cvs. Capitol and Mosa). At 14 days post inoculation (DPI) with Xcc, there was a...

Glutathione (GSH) plays diverse roles in the physiological processes, stress defense, growth, and development of plants. This study investigated the effects of exogenous GSH on the biochemical responses of reactive oxygen species and antioxidant levels in rice (Oryza sativa L. cv. Dasan) seedlings under arsenic (As) stress. As treatment inhibited g...

Proline metabolism influences metabolic and signaling pathway in regulating plant stress responses. This study aimed to characterize the physiological significance of glutamate (Glu)-mediated proline metabolism in the drought stress responses, focusing on the hormonal regulatory pathway. The responses of cytosolic Ca ²⁺ signaling, proline metabolis...

This project aimed at characterizing several heat stress sequences applied during seed maturation with the objective to identify sequences with priming effect on seed quality. For this, we analyzed criteria related to nutritional quality (like FA profiles and protein contents) and to physiological quality to evaluate the seed storage capacity and t...

Oilseed rape (Brassica napus L.) is an oleoproteaginous crop characterized by low N use efficiency (NUE) that is mainly related to a weak Nitrogen Remobilization Efficiency (NRE) during the sequential leaf senescence of the vegetative stages. Based on the hypothesis that proteolysis efficiency is crucial for the improvement of leafNRE, our objectiv...

Salicylic acid (SA) has been regarded as the important phytohormone in improving abiotic stress tolerance. However, the physiological mechanisms on drought stress tolerance remain largely unknown. To investigate the role of SA in drought-stress tolerance in Chinese cabbage (Brassica rapa subsp. pekinensis) with regard to cellular redox control and...

The goal of this study was to characterize hormonal regulation of drought stress-induced responses and salicylic acid (SA)-mediated stress responses, focusing on redox control. The responses of reactive oxygen species (ROS) and proline metabolism, antioxidant activity, and redox status to SA pretreatment and/or drought imposition were interpreted a...

This project aimed at characterizing several heat stress sequences applied during seed maturation with the objective to identify sequences with priming effect on seed quality. For this, we analyzed criteria related to nutritional quality (like FA profiles and protein contents) and to physiological quality to evaluate the seed storage capacity and t...

To characterize the p-coumaric acid (pCA)-induced phenolic metabolites in relation to the disease resistance against Xanthomonas campestris pv. campestris (Xcc.), the responses of soluble- and cell wall-bound flavonoid and hydroxycinnamic acids compounds to the pretreatment of pCA or the inhibitor of the 4-coumarate-CoA ligase, 3,4-(methylenedioxy)...

Objective: The present study aimed to assess the nitrogen (N) use efficiency of acidified pig slurry for regrowth yield and its environmental impacts on perennial ryegrass swards. Methods: The pH of digested pig slurry was adjusted to 5.0 or 7.0 by the addition of sulfuric acid and untreated as a control. The pig slurry urea of each treatment wa...

This study aimed to directly elucidate cultivar variation in disease susceptibility and disease responses in relation to hormonal status in the interaction of Brassica napus cultivars and Xanthomonas campestris pv. campestris (Xcc), the causal agent of black rot disease. Fully expanded leaves of six B. napus cultivars (cvs. Capitol, Youngsan, Satur...

Objective The study aimed to assess the N use efficiency (NUE) of pig slurry (in comparison with chemical fertilizer) for each regrowth yield and annual herbage production and their nutritive value. Methods Consecutive field experiments were separately performed using a single application with a full dose of N (200 kg N/ha) in 2014 and by four spl...

To assess the roles of sulfur (S) nutrition in salt stress tolerance in Kentucky bluegrass (Poa pratensis L.). The plants grown in S-supplied or S-deprived condition for 4 weeks were exposed to salt stress with 100 mM NaCl or non-salt stress, respectively, for 21 days. Osmotic potential was significantly decreased by salt stress from day 14. Photos...

To investigate the varietal difference in sulfur use efficiency (SUE) and drought stress tolerance, Brassica napus ‘Mosa’ and ‘Saturnin’ were exposed to polyethylene glycol (PEG)-induced drought stress for 72 h. Direct quantification of S uptake, de novo synthesis of amino acids and proteins was performed by tracing ³⁴S. The responses of photosynth...

To characterize the hormonal regulation of nitrogen remobilization from source to pod filling in Brassica napus, the hormonal level, proteolytic process, and amino acid transport were assessed in mature leaves of pod-removed or control at the early pod-filling stage. Pod (sink) removal decreased salicylic acid (SA), and significantly increased jasm...

In coming decades, increasing temperatures are expected to impact crop yield and seed quality. To develop low input systems, the effects of temperature and sulfur (S) nutrition in oilseed rape, a high S demanding crop, need to be jointly considered. In this study, we investigated the effects of temperatures [High Temperature (HT), 33°C/day, 19°C/ni...

Les modèles climatiques actuels prédisent une augmentation des températures en fin de printemps, au moment du remplissage des graines, ce qui pourrait avoir une incidence sur le rendement des cultures de colza et la qualité des graines. Par ailleurs, cette culture a des besoins en soufre (S) importants, en particulier en fin de cycle. Dans un conte...

This study was conducted to assess the efficacy of slurry acidification in reducing ammonia emission from manure storage and application. The non-fermented cattle manure (NFC) and swine slurry (SS) were acidified by sulfuric acid and stored in an acryl chamber for 168 and 96 hours, respectively. Ammonia emitted from the chamber was collected using...

Brassica napus is characterized by low nitrogen remobilization efficiency from source leaves to seed filling, which is mainly due to poor hydrolysis of foliar proteins. To investigate the roles of salicylic acid (SA) in the proteolytic process in source organ at the early pod-filling stage, the SA concentration, protein profile, protease activity,...

In coming decades, increasing temperatures are expected to impact crop yield and seed quality. To develop low input systems, the effects of temperature and sulfur (S) nutrition in oilseed rape, a high S demanding crop, need to be jointly considered. In this study, we investigated the effects of temperatures [High Temperature (HT), 33°C/day, 19°C/ni...

Background and aims In the coming decades, increasing spring temperatures are expected to impact crop yield and grain quality. Therefore, in a context of developing low input systems, the effects of temperature and sulfur (S) nutrition in rapeseed which is a high S demanding crop, should be jointly considered. Materials and Methods In this study,...

To investigate the regulatory interactions between S assimilation and N metabolism in Brassica napus, de novo synthesis of amino acids and proteins was quantified by 15N and 34S tracing, and the responses of transporter genes, assimilatory enzymes and metabolites pool involving in nitrate and sulfate metabolism were assessed under continuous sulfur...

Sulfur (S) deficiency effects on nitrogen (N) and S fluxes during vegetative growth of Brassica napus was investigated by tracing 15N and 34S for 9 d of S-sufficient [1.5 mM sulfate (SO42-)] and S-deficient (0.05 mM SO42-) condition. A significant decrease in leaf osmotic potential and chlorophyll content was apparent after 9 d of S-deficiency. Sul...

We investigated transcriptional and physiological changes in relation to Fe transport and uptake under various conditions of iron (Fe)-deficiency and cadmium (Cd) toxicity. Responses to four such Fe/Cd conditions were evaluated, revealing that oxidative stress was generated in the presence of Cd, followed by a decrease in Fe and an increase in Cd c...