An EAR-motif-containing ERF transcription factor affects herbivore-induced signaling, defense and resistance in rice
Jing Lu,Hongping Ju,Guoxin Zhou,Chuanshu Zhu,Chuanshu Zhu,Matthias Erb,Xiaopeng Wang,Peng Wang,Yonggen Lou +8 more
TL;DR: It is proposed that OsERF3 affects early components of herbivore-induced defense responses by suppressing MAPK repressors and modulating JA, SA, ethylene and H(2)O( 2) pathways as well as plant resistance.
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Abstract: Ethylene responsive factors (ERFs) are a large family of plant-specific transcription factors that are involved in the regulation of plant development and stress responses However, little to nothing is known about their role in herbivore-induced defense We discovered a nucleus-localized ERF gene in rice (Oryza sativa), OsERF3, that was rapidly up-regulated in response to feeding by the rice striped stem borer (SSB) Chilo suppressalis Antisense and over-expression of OsERF3 revealed that it positively affects transcript levels of two mitogen-activated protein kinases (MAPKs) and two WRKY genes as well as concentrations of jasmonate (JA), salicylate (SA) and the activity of trypsin protease inhibitors (TrypPIs) OsERF3 was also found to mediate the resistance of rice to SSB On the other hand, OsERF3 was slightly suppressed by the rice brown planthopper (BPH) Nilaparvata lugens (Stal) and increased susceptibility to this piercing sucking insect, possibly by suppressing H(2)O(2) biosynthesis We propose that OsERF3 affects early components of herbivore-induced defense responses by suppressing MAPK repressors and modulating JA, SA, ethylene and H(2)O(2) pathways as well as plant resistance Our results also illustrate that OsERF3 acts as a central switch that gears the plant's metabolism towards an appropriate response to chewing or piercing/sucking insects
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Arabidopsis MAP kinase 4 regulates gene expression through transcription factor release in the nucleus
Jin-Long Qiu,Berthe Katrine Fiil,Klaus Petersen,Henrik Nielsen,Christopher J. Botanga,Stephan Thorgrimsen,Kristoffer Palma,Maria Cristina Suarez-Rodriguez,Signe Sandbech-Clausen,Jacek Lichota,Peter Brodersen,Klaus D. Grasser,Ole Mattsson,Jane Glazebrook,John Mundy,Morten Petersen +15 more
TL;DR: The data establish direct links between MPK4 and innate immunity and provide an example of how a plant MAP kinase can regulate gene expression by releasing transcription factors in the nucleus upon activation.
Herbivory Rapidly Activates MAPK Signaling in Attacked and Unattacked Leaf Regions but Not between Leaves of Nicotiana attenuata
TL;DR: It is proposed that M. sexta attack elicits a mobile signal that travels to nonwounded regions of the attacked leaf where it activates MAPK signaling and, thus, downstream responses; subsequently, a different signal is transported by the vascular system to systemic leaves to initiate defense responses without activating MAPKs in systemic leaves.
454
The Mitogen-Activated Protein Kinase Cascade MKK3–MPK6 Is an Important Part of the Jasmonate Signal Transduction Pathway in Arabidopsis
Fuminori Takahashi,Riichiro Yoshida,Kazuya Ichimura,Tsuyoshi Mizoguchi,Shigemi Seo,Masahiro Yonezawa,Kyonoshin Maruyama,Kazuko Yamaguchi-Shinozaki,Kazuo Shinozaki +8 more
TL;DR: A mitogen-activated protein kinase (MAPK) cascade, MAPK KINASE 3 (MKK3)–MAPK 6 (MPK6), which is activated by JA in Arabidopsis is identified and shows that JA negatively controls ATMYC2/JIN1 expression, which indicates important roles in JA signaling.
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A Raf-Like MAPKKK Gene DSM1 Mediates Drought Resistance through Reactive Oxygen Species Scavenging in Rice
TL;DR: Results suggest that DSM1 might be a novel MAPKKK functioning as an early signaling component in regulating responses to drought stress by regulating scavenging of ROS in rice.
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Flg22 regulates the release of an ethylene response factor substrate from MAP kinase 6 in Arabidopsis thaliana via ethylene signaling
Gerit Bethke,Tino Unthan,Joachim F. Uhrig,Yvonne Pöschl,Andrea A. Gust,Dierk Scheel,Justin Lee +6 more
TL;DR: Microarray data show enrichment of GCC motifs in the promoters of ERF104–up-regulated genes, many of which are stress related, as altered expression in both erf104 and overexpressors led to more growth inhibition by flg22 and enhanced susceptibility to a non-adapted bacterial pathogen.
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