Delayed germination of Brassica parachinensis seeds by coumarin involves decreased GA4 production and a consequent reduction of ROS accumulation

2021 ◽  
pp. 1-12
Author(s):  
Bing-Xian Chen ◽  
Yuan-Xuan Peng ◽  
Xue-Qin Yang ◽  
Jun Liu
Keyword(s):  
Seed Germination ◽  
Superoxide Anion ◽  
Inhibitory Effect ◽  
Histochemical Staining ◽  
Oxygen Species ◽  
Synthesis Inhibitor ◽  
Ros Accumulation ◽  
Consequent Reduction ◽  
Endogenous Phytohormones ◽  
Germinating Seeds

Abstract The plant allelochemical coumarin effectively inhibits the germination of Brassica parachinensis (B. parachinensis) seeds. Quantification of endogenous phytohormones showed that contents of abscisic acid (ABA), ABA glucose ester, gibberellin A20 (GA20), GA3, GA15, GA24, GA9 and GA4 were higher in germinating seeds than in seedlings. Moreover, the presence of coumarin significantly reduced the content of bioactive GA4 which is thought to positively regulate seed germination. Histochemical staining and spectrophotometry of reactive oxygen species (ROS) revealed that exogenous GA3 and GA4+7 could effectively promote the production of endogenous ROS during germination and that the GA synthesis inhibitor paclobutrazol could effectively inhibit production of ROS. Coumarin significantly inhibited the accumulation of ROS, especially superoxide anion radical ( ${\rm O}_2^{{\cdot}{-}} $ ). This inhibitory effect could be restored by the addition of exogenous GA3 and GA4+7. Coumarin also inhibited the activity of the ROS-degrading enzymes such as superoxide dismutase, catalase and peroxidase as well as β-amylase in seeds and seedlings. Taken together, we propose a model for the regulation of seed germination in B. parachinensis by coumarin, Gas and ROS, in which coumarin may delay seed germination by reducing endogenous GA4, thus decreasing the accumulation of ROS.

Reactive oxygen species and seed germination

Biologia ◽  
2013 ◽  
Vol 68 (3) ◽  
Author(s):  
Marcelo Gomes ◽  
Queila Garcia
Keyword(s):  
Reactive Oxygen Species ◽  
Seed Germination ◽  
Reactive Oxygen ◽  
Environmental Cues ◽  
Oxygen Species ◽  
Ros Scavenging ◽  
Endosperm Weakening ◽  
Ros Accumulation ◽  
Germination Success ◽  
Seed Reserves

AbstractReactive oxygen species (ROS) are continuously produced by the metabolically active cells of seeds, and apparently play important roles in biological processes such as germination and dormancy. Germination and ROS accumulation appear to be linked, and seed germination success may be closely associated with internal ROS contents and the activities of ROS-scavenging systems. Although ROS were long considered hazardous molecules, their functions as cell signaling compounds are now well established and widely studied in plants. In seeds, ROS have important roles in endosperm weakening, the mobilization of seed reserves, protection against pathogens, and programmed cell death. ROS may also function as messengers or transmitters of environmental cues during seed germination. Little is currently known, however, about ROS biochemistry or their functions or the signaling pathways during these processes, which are to be considered in the present review.

The ABI4‐RbohD/VTC2 regulatory module promotes reactive oxygen species (ROS) accumulation to decrease seed germination under salinity stress

2020 ◽  
Vol 229 (2) ◽  
pp. 950-962
Author(s):  
Xiaofeng Luo ◽  
Yujia Dai ◽  
Chuan Zheng ◽  
Yingzeng Yang ◽  
Wei Chen ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Seed Germination ◽  
Salinity Stress ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Regulatory Module ◽  
Ros Accumulation

scholarly journals Transcriptomic comparison between Brassica oleracea and rice (Oryza sativa) reveals diverse modulations on cell death in response to Sclerotinia sclerotiorum

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Jiaqin Mei ◽  
Yijuan Ding ◽  
Yuehua Li ◽  
Chaobo Tong ◽  
Hai Du ◽  
...  
Keyword(s):  
Cell Death ◽  
Brassica Oleracea ◽  
Sclerotinia Sclerotiorum ◽  
Transcriptome Sequencing ◽  
Histochemical Staining ◽  
Oxygen Species ◽  
Wrky Transcription Factors ◽  
Ros Accumulation ◽  
Before And After ◽  
Insight Into

Abstract Sclerotinia stem rot caused by Sclerotinia sclerotiorum is a devastating disease of Brassica crops, but not in rice. The leaves of a rice line, a partial resistant (R) and a susceptible (S) Brassica oleracea pool that bulked from a resistance-segregating F2 population were employed for transcriptome sequencing before and after inoculation by S. sclerotiorum for 6 and 12 h. Distinct transcriptome profiles were revealed between B. oleracea and rice in response to S. sclerotiorum. Enrichment analyses of GO and KEGG indicated an enhancement of antioxidant activity in the R B. oleracea and rice, and histochemical staining exhibited obvious lighter reactive oxygen species (ROS) accumulation and cell death in rice and the R B. oleracea as compared to that in the S B. oleracea. Significant enhancement of Ca2+ signalling, a positive regulator of ROS and cell death, were detected in S B. oleracea after inoculation, while it was significantly repressed in the R B. oleracea group. Obvious difference was detected between two B. oleracea groups for WRKY transcription factors, particularly for those regulating cell death. These findings suggest diverse modulations on cell death in host in response to S. sclerotiorum. Our study provides useful insight into the resistant mechanism to S. sclerotiorum.

PROTECTIVE EFFECT OF POLYPEPTIDE AND AMINO ACIDS ON THE DEVELOPMENT OF THE NERVOUS TISSUE CULTURE IN THE PRESENCE OF CYCLOPHOSPHAMIDE

2017 ◽  
pp. 22-26
Author(s):  
V. B. Dolgo-Saburov ◽  
N. I. Chalisova ◽  
L. V. Lyanginen ◽  
E. S. Zalomaeva
Keyword(s):  
Amino Acids ◽  
Cell Proliferation ◽  
Tissue Culture ◽  
Protective Effect ◽  
Organotypic Culture ◽  
Inhibitory Effect ◽  
Mustard Gas ◽  
Synthesis Inhibitor ◽  
Combined Administration ◽  
The Central Nervous System

In an organotypic culture, an investigation was conducted into combined effects of cyclophosphamide DNA as synthesis inhibitor used to model a resorptive action of mustard gas, and cortexin polypeptide or each of 20 encoded amino acids on the development of cell proliferation in cerebral cortex explants of the rat. The combined administration of cyclophosphamide together with cortexin or with each of the 20 encoded amino acids, except glycine, showed suppression of the cytostatic agent inhibitory effect. Thus, cortexin and amino acids have a protective effect on cell proliferation in the tissue culture of the central nervous system under the action of mustardlike substances.

Danshensu Rescues Ischemia/Reperfusion Caused Human Hepatocyte Death

2018 ◽  
Vol 17 (2) ◽  
pp. 117-121
Author(s):  
Sun Maw-Sheng ◽  
Liang Chun-Ya ◽  
Hsieh Po-Chun ◽  
Kuo Chan-Yen
Keyword(s):  
Oxidative Stress ◽  
Reactive Oxygen Species ◽  
Caspase 3 ◽  
Ischemia Reperfusion ◽  
Oxygen Species ◽  
Good Strategy ◽  
Ros Accumulation ◽  
Dichlorofluorescin Diacetate ◽  
Hepatocyte Damage ◽  
Hepatocyte Death

Apoptosis of hepatocyte, under ischemia/reperfusion (IR) conditions, has been identified as an essential process in the progression of liver transplantation. Under these conditions, mitochondria can become a threat to the cell because of their capacity to generate reactive oxygen species (ROS). Additionally, ROS overproduction may induce inflammation. As ROS accumulation appears to cause hepatocyte damage or death, there has been considerable interest in identifying the candidate natural products involved and in developing strategies to reduce oxidative stress. In this study, we use Danshensu as a candidate product to speculate whether has the protective effect on apoptotic hepatocyte upon IR. To speculate the apoptotic phenomena was reversed by Danshensu, we detected the p53, cleaved-caspase 3 expression by western blotting, as well as caspase-3 activity. Additionally, we analyzed the ROS levels by 2′,7′-dichlorofluorescin diacetate (DCF-DA) staining. We also detected the cell viability by WST-1. Results showed that Danshensu alleviated hypoxia-caused cell apoptosis via ROS overproduction. We suggested that Danshensu is a good strategy for treating hepatocyte damage upon IR.

scholarly journals The Fungal Effector Avr-Pita Suppresses Innate Immunity by Increasing COX Activity in Rice Mitochondria

Rice ◽  
2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Jingluan Han ◽  
Xiaoyu Wang ◽  
Fengpin Wang ◽  
Zhe Zhao ◽  
Gousi Li ◽  
...  
Keyword(s):  
Innate Immunity ◽  
Host Plant ◽  
Fungal Pathogen ◽  
Defense Responses ◽  
Oxygen Species ◽  
Mitochondrial Reactive Oxygen Species ◽  
Molecular Pattern ◽  
Ros Accumulation ◽  
Ros Metabolism ◽  
Increased Susceptibility

Abstract Background Avr-Pita was the first effector identified in the blast fungus (Magnaporthe oryzae)–rice (Oryza sativa) pathosystem. However, the molecular mechanism underlying its effects on the host plant has remained a long-standing mystery. Results Here, we report that ectopically expressing Avr-Pita in rice enhances susceptibility to M. oryzae and suppresses pathogen-associated molecular pattern (PAMP)-triggered defense responses. Avr-Pita targets the host mitochondria and interacts with the cytochrome c oxidase (COX) assembly protein OsCOX11, a key regulator of mitochondrial reactive oxygen species (ROS) metabolism in rice. Overexpressing Avr-Pita or OsCOX11 increased COX activity and decreased ROS accumulation triggered by the fungal PAMP chitin. OsCOX11-overexpressing plants showed increased susceptibility to M. oryzae, whereas OsCOX11-knockdown plants showed resistance to M. oryzae. Conclusions Taken together, these findings suggest that the fungal pathogen M. oryzae delivers the effector Avr-Pita to the host plant, where it enhances COX activity thus decreasing ROS accumulation. Therefore, this effector suppresses host innate immunity by perturbing ROS metabolism in the mitochondria.

scholarly journals An Anti-Inflammatory 2,4-Cyclized-3,4-Secospongian Diterpenoid and Furanoterpene-Related Metabolites of a Marine Sponge Spongia sp. from the Red Sea

Marine Drugs ◽  
2021 ◽  
Vol 19 (1) ◽  
pp. 38
Author(s):  
Chi-Jen Tai ◽  
Chiung-Yao Huang ◽  
Atallah F. Ahmed ◽  
Raha S. Orfali ◽  
Walied M. Alarif ◽  
...  
Keyword(s):  
Red Sea ◽  
Superoxide Anion ◽  
Dermal Fibroblast ◽  
Fibroblast Cell ◽  
Inhibitory Effect ◽  
Human Dermal Fibroblast ◽  
Superoxide Anion Generation ◽  
Potent Inhibitory Effect ◽  
Anti Inflammatory ◽  
New Compounds

Chemical investigation of a Red Sea Spongia sp. led to the isolation of four new compounds, i.e., 17-dehydroxysponalactone (1), a carboxylic acid, spongiafuranic acid A (2), one hydroxamic acid, spongiafuranohydroxamic acid A (3), and a furanyl trinorsesterpenoid 16-epi-irciformonin G (4), along with three known metabolites (−)-sponalisolide B (5), 18-nor- 3,17-dihydroxy-spongia-3,13(16),14-trien-2-one (6), and cholesta-7-ene-3β,5α-diol-6-one (7). The biosynthetic pathway for the molecular skeleton of 1 and related compounds was postulated for the first time. Anti-inflammatory activity of these metabolites to inhibit superoxide anion generation and elastase release in N-formyl-methionyl-leucyl phenylalanine/cytochalasin B (fMLF/CB)-induced human neutrophil cells and cytotoxicity of these compounds toward three cancer cell lines and one human dermal fibroblast cell line were assayed. Compound 1 was found to significantly reduce the superoxide anion generation and elastase release at a concentration of 10 μM, and compound 5 was also found to display strong inhibitory activity against superoxide anion generation at the same concentration. Due to the noncytotoxic activity and the potent inhibitory effect toward the superoxide anion generation and elastase release, 1 and 5 can be considered to be promising anti-inflammatory agents.

scholarly journals A Novel Tetrapeptide Derivative Exhibits In Vitro Inhibition of Neutrophil-Derived Reactive Oxygen Species and Lysosomal Enzymes Release

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Sumitra Miriyala ◽  
Manikandan Panchatcharam ◽  
Meera Ramanujam ◽  
Rengarajulu Puvanakrishnan
Keyword(s):  
Reactive Oxygen Species ◽  
Superoxide Anion ◽  
Lysosomal Enzymes ◽  
Reactive Oxygen ◽  
Peptide Sequence ◽  
Ros Generation ◽  
Oxygen Species ◽  
Complement Factors

Neutrophil infiltration plays a major role in the pathogenesis of myocardial injury. Oxidative injury is suggested to be a central mechanism of the cellular damage after acute myocardial infarction. This study is pertained to the prognostic role of a tetrapeptide derivative PEP1261 (BOC-Lys(BOC)-Arg-Asp-Ser(tBu)-OtBU), a peptide sequence (39–42) of lactoferrin, studied in the modulation of neutrophil functions in vitro by measuring the reactive oxygen species (ROS) generation, lysosomal enzymes release, and enhanced expression of C proteins. The groundwork experimentation was concerned with the isolation of neutrophils from the normal and acute myocardial infarct rats to find out the efficacy of PEP1261 in the presence of a powerful neutrophil stimulant, phorbol 12-myristate 13 acetate (PMA). Stimulation of neutrophils with PMA resulted in an oxidative burst of superoxide anion and enhanced release of lysosomal enzymes and expression of complement proteins. The present study further demonstrated that the free radicals increase the complement factors in the neutrophils confirming the role of ROS. PEP1261 treatment significantly reduced the levels of superoxide anion and inhibited the release of lysosomal enzymes in the stimulated control and infarct rat neutrophils. This study demonstrated that PEP1261 significantly inhibited the effect on the ROS generation as well as the mRNA synthesis and expression of the complement factors in neutrophils isolated from infarct heart.

The Effect of High Concentrations of Ethylene on Seed Germination of Douglas Fir (Pseudotsugamenziesii (Mirb.) Franco)

1975 ◽  
Vol 5 (3) ◽  
pp. 419-423 ◽  
Author(s):  
Carey Borno ◽  
Iain E. P. Taylor
Keyword(s):  
Seed Germination ◽  
Germination Rate ◽  
Inhibitory Effect ◽  
Germination Percentage ◽  
Douglas Fir ◽  
Control Treatment ◽  
Continuous Exposure ◽  
Short Term ◽  
Short Term Exposure ◽  
High Concentrations

Stratified, imbibed Douglas fir (Pseudotsugamenziesii (Mirb.) Franco) seeds were exposed to 100% ethylene for times between 0 and 366 h. Germination rate and germination percentage were increased by treatments up to 48 h. The 12-h treatment gave largest stimulation; 30% enhancement of final germination percentage over control. Treatment for 96 h caused increased germination rate for the first 5 days but reduced the germination percentage. Germinants were subject to continuous exposure to atmospheres containing 0.1 – 200 000 ppm ethylene in air, but it did not stimulate growth, and the gas was inhibitory above 100 ppm. Although some effects of high concentrations of ethylene may have been due to the lowering of oxygen supplies, this alone was insufficient to account for the full inhibitory effect. The mechanism of stimulation by short-term exposure to ethylene is discussed.

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