Jasmonates: Plant Stress Hormones as Anticancer Agents

2012 ◽  
pp. 303-322
Author(s):  
Dorit Reischer-Pelech ◽  
Eliezer Flescher
Keyword(s):  
Anticancer Agents ◽  
Stress Hormones ◽  
Plant Stress

Plant Stress Hormones Nanobiotechnology

2021 ◽  
pp. 349-373
Author(s):  
Sashi Sonkar ◽  
Laxuman Sharma ◽  
Rishi Kumar Singh ◽  
Brijesh Pandey ◽  
Saurabh Singh Rathore ◽  
...  
Keyword(s):  
Stress Hormones ◽  
Plant Stress

Involvement of plant stress hormones in Burkholderia phytofirmans-induced shoot and root growth promotion

2015 ◽  
Vol 77 (2) ◽  
pp. 179-187 ◽  
Author(s):  
Leonid V. Kurepin ◽  
Jae Min Park ◽  
George Lazarovits ◽  
Norman P. A. Hüner
Keyword(s):  
Root Growth ◽  
Growth Promotion ◽  
Stress Hormones ◽  
Plant Stress ◽  
Shoot And Root Growth ◽  
Root Growth Promotion

scholarly journals Dual control of MAPK activities by AP2C1 and MKP1 MAPK phosphatases regulates defence responses in Arabidopsis

2021 ◽  
Author(s):  
Zahra Ayatollahi ◽  
Vaiva Kazanaviciute ◽  
Volodymyr Shubchynskyy ◽  
Kotryna Kvederaviciute ◽  
Manfred Schwanninger ◽  
...  
Keyword(s):  
Stress Responses ◽  
Stress Hormones ◽  
Plant Stress ◽  
Mitogen Activated Protein Kinase ◽  
Environmental Signals ◽  
Mapk Cascades ◽  
Mitogen Activated Protein ◽  
Plant Stress Responses ◽  
Mapk Phosphatases ◽  
Defence Responses

Mitogen-activated protein kinase (MAPK) cascades transmit environmental signals and induce stress and defence responses in plants. These signalling cascades are negatively controlled by specific phosphatases of the type 2C Ser/Thr protein phosphatase (PP2C) and dual-specificity phosphatase (DSP) families that inactivate stress-induced MAPKs; however, the interplay between phosphatases of these different types has remained unknown. Our work reveals that different Arabidopsis MAPK phosphatases, the PP2C-type AP2C1 and the DSP-type MKP1, exhibit both specific and overlapping functions in plant stress responses. Each single mutant and ap2c1 mkp1 double mutant displayed enhanced wound-induced activation of MAPKs MPK3, MPK4, and MPK6, as well as induction of a set of transcription factors. Moreover, ap2c1 mkp1 double mutants show an autoimmune-like response, associated with elevated levels the stress hormones salicylic acid and ethylene, and of the phytoalexin camalexin. Interestingly, this phenotype is reduced in ap2c1 mkp1 mpk6 triple mutants, suggesting that the autoimmune-like response is due to MPK6 misregulation. We conclude that the evolutionarily distant MAPK phosphatases AP2C1 and MKP1 contribute crucially to the tight control of MPK6 activity, ensuring appropriately balanced stress signalling and suppression of autoimmune-like responses during plant growth and development.

scholarly journals The Endophytic Fungus Cyanodermella asteris Influences Growth of the Non-Natural Host Plant Arabidopsis thaliana

2021 ◽  
Author(s):  
Linda Jahn ◽  
Lisa Storm-Johannsen ◽  
Diana Seidler ◽  
Jasmin Noack ◽  
Wei Gao ◽  
...  
Keyword(s):  
Lateral Root ◽  
Root Biomass ◽  
Close Contact ◽  
Stress Hormones ◽  
Plant Stress ◽  
Fungal Endophyte ◽  
Fungal Metabolites ◽  
Perennial Plant ◽  
Volatile Organic ◽  
Plant Arabidopsis Thaliana

Cyanodermella asteris is a fungal endophyte from Aster tataricus, a perennial plant from the Northern part of Asia. Here, we demonstrated an interaction of C. asteris with Arabidospis thaliana, Chinese cabbage, rapeseed, tomato, maize or sunflower resulting in different phenotypes such as shorter main roots, massive lateral root growth, higher leaf and root biomass, and increased anthocyanin levels. In a variety of co-cultivation assays, it was shown that these altered phenotypes are caused by fungal CO2, volatile organic compounds, and soluble compounds, notably astins. Astins A, C and G induced plant growth when they were individually included in the medium. In return, A. thaliana stimulates the fungal astin C production during co-cultivation. Taken together, our results indicate a bilateral interaction between the fungus and the plant. A stress response in plants is induced by fungal metabolites while plant stress hormones induced astin C production of the fungus. Interestingly, our results not only show unidirectional influence of the fungus on the plant, but vice versa. The plant is able to influence growth and secondary metabolite production in the endophyte, even when both organisms do not live in close contact, suggesting the involvement of volatile compounds.

scholarly journals Computational Disorder Analysis in Ethylene Response Factors Uncovers Binding Motifs Critical to Their Diverse Functions

2019 ◽  
Vol 21 (1) ◽  
pp. 74 ◽  
Author(s):  
Xiaolin Sun ◽  
Nawar Malhis ◽  
Bi Zhao ◽  
Bin Xue ◽  
Joerg Gsponer ◽  
...  
Keyword(s):  
Stress Hormones ◽  
Plant Stress ◽  
Structural Features ◽  
Ethylene Response Factor ◽  
Response Factors ◽  
Protein Protein Interaction ◽  
Ethylene Response ◽  
Intrinsically Disorder ◽  
Functional Features ◽  
Ethylene Signalling

APETALA2/ETHYLENE RESPONSE FACTOR transcription factors (AP2/ERFs) play crucial roles in adaptation to stresses such as those caused by pathogens, wounding and cold. Although their name suggests a specific role in ethylene signalling, some ERF members also co-ordinate signals regulated by other key plant stress hormones such as jasmonate, abscisic acid and salicylate. We analysed a set of ERF proteins from three divergent plant species for intrinsically disorder regions containing conserved segments involved in protein–protein interaction known as Molecular Recognition Features (MoRFs). Then we correlated the MoRFs identified with a number of known functional features where these could be identified. Our analyses suggest that MoRFs, with plasticity in their disordered surroundings, are highly functional and may have been shuffled between related protein families driven by selection. A particularly important role may be played by the alpha helical component of the structured DNA binding domain to permit specificity. We also present examples of computationally identified MoRFs that have no known function and provide a valuable conceptual framework to link both disordered and ordered structural features within this family to diverse function.

scholarly journals Responses of Polyamine-Metabolic Genes to Polyamines and Plant Stress Hormones in Arabidopsis Seedlings

Cells ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 3283
Author(s):  
Yusaku Yariuchi ◽  
Takashi Okamoto ◽  
Yoshiteru Noutoshi ◽  
Taku Takahashi
Keyword(s):  
Methyl Jasmonate ◽  
Plant Hormones ◽  
Amine Oxidase ◽  
Stress Hormones ◽  
Plant Stress ◽  
Polyamine Metabolism ◽  
Negative Feedback Regulation ◽  
Oxidase Gene ◽  
Spermine Synthase ◽  
Metabolic Genes

In plants, many of the enzymes in polyamine metabolism are encoded by multiple genes, whose expressions are differentially regulated under different physiological conditions. For comprehensive understanding of their regulation during the seedling growth stage, we examined the expression of polyamine metabolic genes in response to polyamines and stress-related plant hormones in Arabidopsis thaliana. While confirming previous findings such as induction of many of the genes by abscisic acid, induction of arginase genes and a copper amine oxidase gene, CuAOα3, by methyl jasmonate, that of an arginine decarboxylase gene, ADC2, and a spermine synthase gene, SPMS, by salicylic acid, and negative feedback regulation of thermospermine biosynthetic genes by thermospermine, our results showed that expressions of most of the genes are not responsive to exogenous polyamines. We thus examined expression of OsPAO6, which encodes an apoplastic polyamine oxidase and is strongly induced by polyamines in rice, by using the promoter-GUS fusion in transgenic Arabidopsis seedlings. The GUS activity was increased by treatment with methyl jasmonate but neither by polyamines nor by other plant hormones, suggesting a difference in the response to polyamines between Arabidopsis and rice. Our results provide a framework to study regulatory modules directing expression of each polyamine metabolic gene.

scholarly journals Foliar-Applied Glutathione Mitigates Cadmium-Induced Oxidative Stress by Modulating Antioxidant-Scavenging, Redox-Regulating, and Hormone-Balancing Systems in Brassica napus

2021 ◽  
Vol 12 ◽  
Author(s):  
Ha-il Jung ◽  
Tae-Gu Lee ◽  
Jinwook Lee ◽  
Mi-Jin Chae ◽  
Eun-Jin Lee ◽  
...  
Keyword(s):  
Brassica Napus ◽  
Redox Regulation ◽  
Stress Hormones ◽  
Plant Stress ◽  
Nicotinamide Adenine Dinucleotide Phosphate ◽  
Redox Status ◽  
Metabolic Effects ◽  
Cd Stress ◽  
Cd Uptake ◽  
Redox States

The antioxidant glutathione (GSH) mitigates adverse physio-metabolic effects and defends against abiotic types of stress, such as cadmium (Cd) stress. However, its function and role in resisting Cd phytotoxicity by leveraging plant antioxidant-scavenging, redox-regulating, and hormone-balancing systems have not been comprehensively and systematically demonstrated in the Cd-hyperaccumulating plant Brassica napus L. cv. Tammi (oilseed rape). In this study, the effects of exogenously applied GSH to the leaves of B. napus seedlings exposed to Cd (10 μM) were investigated. As a result, Cd stress alone significantly inhibited growth and increased the levels of reactive oxygen species (ROS) and the bioaccumulation of Cd in the seedlings compared with those in unstressed controls. Furthermore, Cd stress induced an imbalance in plant stress hormone levels and decreases in endogenous GSH levels and GSH redox ratios, which were correlated with reductions in ascorbate (AsA) and/or nicotinamide adenine dinucleotide phosphate (NADPH) redox states. However, the exogenous application of GSH to Cd-stressed B. napus seedlings reduced Cd-induced ROS levels and enhanced antioxidant-scavenging defenses and redox regulation by both increasing seedling AsA, GSH, and NADPH concentrations and rebalancing stress hormones, thereby enhancing Cd uptake and accumulation. These results demonstrate that GSH improved plant redox status by upregulating the AsA-GSH-NADPH cycle and reestablishing normal hormonal balance. This indicates that exogenously applied GSH can mitigate Cd phytotoxicity in B. napus and possibly other plants. Therefore, GSH can potentially be applied to Cd-polluted soil for plant remediation.

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