scholarly journals Contrasting nutrient-disease relationships: Potassium gradients in barley leaves have opposite effects on two fungal pathogens with different sensitivities to jasmonic acid

2018 ◽  
Vol 41 (10) ◽  
pp. 2357-2372 ◽  
Author(s):  
Jayne L. Davis ◽  
Patrick Armengaud ◽  
Tony R. Larson ◽  
Ian A. Graham ◽  
Philip J. White ◽  
...  
Keyword(s):  
Jasmonic Acid ◽  
Fungal Pathogens ◽  
Barley Leaves

scholarly journals Circadian Network Interactions with Jasmonate Signaling and Defense

Plants ◽  
2019 ◽  
Vol 8 (8) ◽  
pp. 252 ◽  
Author(s):  
Bryan Thines ◽  
Emily V. Parlan ◽  
Elena C. Fulton
Keyword(s):  
Transcription Factor ◽  
Jasmonic Acid ◽  
Circadian Clock ◽  
Fungal Pathogens ◽  
Future Research ◽  
Biotic Stresses ◽  
Clock Proteins ◽  
Jaz Proteins ◽  
Multiple Levels ◽  
Ja Signaling

Plants experience specific stresses at particular, but predictable, times of the day. The circadian clock is a molecular oscillator that increases plant survival by timing internal processes to optimally match these environmental challenges. Clock regulation of jasmonic acid (JA) action is important for effective defenses against fungal pathogens and generalist herbivores in multiple plant species. Endogenous JA levels are rhythmic and under clock control with peak JA abundance during the day, a time when plants are more likely to experience certain types of biotic stresses. The expression of many JA biosynthesis, signaling, and response genes is transcriptionally controlled by the clock and timed through direct connections with core clock proteins. For example, the promoter of Arabidopsis transcription factor MYC2, a master regulator for JA signaling, is directly bound by the clock evening complex (EC) to negatively affect JA processes, including leaf senescence, at the end of the day. Also, tobacco ZEITLUPE, a circadian photoreceptor, binds directly to JAZ proteins and stimulates their degradation with resulting effects on JA root-based defenses. Collectively, a model where JA processes are embedded within the circadian network at multiple levels is emerging, and these connections to the circadian network suggest multiple avenues for future research.

Insights into the role of jasmonic acid-mediated defenses against necrotrophic and biotrophic fungal pathogens

2012 ◽  
Vol 7 (1) ◽  
pp. 48-56 ◽  
Author(s):  
Christopher J. Antico ◽  
Chad Colon ◽  
Taylor Banks ◽  
Katrina M. Ramonell
Keyword(s):  
Jasmonic Acid ◽  
Fungal Pathogens

scholarly journals Integrated transcriptomic and metabolomic analyses of a wax deficient citrus mutant exhibiting jasmonic acid-mediated defense against fungal pathogens

2018 ◽  
Vol 5 (1) ◽  
Author(s):  
Yizhong He ◽  
Jingwen Han ◽  
Runsheng Liu ◽  
Yuduan Ding ◽  
Jinqiu Wang ◽  
...  
Keyword(s):  
Jasmonic Acid ◽  
Fungal Pathogens

Induction of Hydroxycinnamic Acid Amides and Tryptophan by Jasmonic Acid, Abscisic Acid and Osmotic Stress in Barley Leaves

2001 ◽  
Vol 56 (3-4) ◽  
pp. 193-202 ◽  
Author(s):  
Yuki Ogura ◽  
Atsushi Ishihara ◽  
Hajime Iwamura
Keyword(s):  
Abscisic Acid ◽  
Hordeum Vulgare ◽  
Osmotic Stress ◽  
Jasmonic Acid ◽  
Secondary Metabolism ◽  
Hydroxycinnamic Acid ◽  
Spectroscopic Methods ◽  
Hordeum Vulgare L ◽  
Hydroxycinnamic Acid Amides ◽  
Barley Leaves

AbstractThe effects of jasmonic acid (JA) and abscisic aid (ABA) on secondary metabolism in barley (Hordeum vulgare L.) were investigated. Treatment with JA at 100 μᴍ for 48 h induced accumulation of four compounds in barley primary leaves. The accumulation of these com­pounds was also observed after treatment with ABA at 100 μᴍ. The induced compounds were identified as p-coumaroylputrescine, p-coumaroylagmatine, p-coumaroyl-3-hydroxyagmatine and tryptophan by spectroscopic methods. The profiles of compounds induced by application of JA and ABA were different. JA exhibited stronger inducing activity for hydroxycinnamic acid amides than ABA, while ABA was more active in tryptophan accumulation. The major hydroxycinnamic acid amides in JA-and ABA-treated leaves were p-coumaroylagmatine and p-coumaroyl-3-hydroxyagmatine, respectively. These differences suggested that JA and ABA act in distinct modes. The induction of these compounds was also observed in leaf segments treated with 1 ᴍ sorbitol and glucose. These findings suggested that JA and ABA are involved in accumulation of hydroxycinnamic acid amides and tryptophan in response to osmotic stress in barley.

Abscisic acid and jasmonic acid affect proteinase inhibitor activities in barley leaves

2004 ◽  
Vol 161 (4) ◽  
pp. 389-396 ◽  
Author(s):  
José A. Casaretto ◽  
Gustavo E. Zúñiga ◽  
Luis J. Corcuera
Keyword(s):  
Abscisic Acid ◽  
Jasmonic Acid ◽  
Proteinase Inhibitor ◽  
Barley Leaves

scholarly journals MoGLN2 Is Important for Vegetative Growth, Conidiogenesis, Maintenance of Cell Wall Integrity and Pathogenesis of Magnaporthe oryzae

2021 ◽  
Vol 7 (6) ◽  
pp. 463
Author(s):  
Osakina Aron ◽  
Min Wang ◽  
Lianyu Lin ◽  
Wajjiha Batool ◽  
Birong Lin ◽  
...  
Keyword(s):  
Cell Wall ◽  
Amino Acid ◽  
Glutamine Synthetase ◽  
Magnaporthe Oryzae ◽  
Vegetative Growth ◽  
Fungal Pathogens ◽  
Cell Wall Integrity ◽  
Fungal Cell ◽  
Barley Leaves ◽  
Living Organisms

Glutamine is a non-essential amino acid that acts as a principal source of nitrogen and nucleic acid biosynthesis in living organisms. In Saccharomyces cerevisiae, glutamine synthetase catalyzes the synthesis of glutamine. To determine the role of glutamine synthetase in the development and pathogenicity of plant fungal pathogens, we used S. cerevisiae Gln1 amino acid sequence to identify its orthologs in Magnaporthe oryzae and named them MoGln1, MoGln2, and MoGln3. Deletion of MoGLN1 and MoGLN3 showed that they are not involved in the development and pathogenesis of M. oryzae. Conversely, ∆Mogln2 was reduced in vegetative growth, experienced attenuated growth on Minimal Medium (MM), and exhibited hyphal autolysis on oatmeal and straw decoction and corn media. Exogenous l-glutamine rescued the growth of ∆Mogln2 on MM. The ∆Mogln2 mutant failed to produce spores and was nonpathogenic on barley leaves, as it was unable to form an appressorium-like structure from its hyphal tips. Furthermore, deletion of MoGLN2 altered the fungal cell wall integrity, with the ∆Mogln2 mutant being hypersensitive to H2O2. MoGln1, MoGln2, and MoGln3 are located in the cytoplasm. Taken together, our results shows that MoGLN2 is important for vegetative growth, conidiation, appressorium formation, maintenance of cell wall integrity, oxidative stress tolerance and pathogenesis of M. oryzae.

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