Fig. 2 Jasmonic acid (JA)-induced reprogramming of the histone acetylation landscape.
#TansleyInsight: The environmentally responsive plant epigenome: insights from #jasmonate signaling
Mark Zander and Emily Vesper
👇
📖 nph.onlinelibrary.wiley.com/doi/10.1111/...
#LatestIssue
In a jasmonate-controlled regulatory pathway, MdMYC2 and MdMED25 induce production of the microRNA miR858, which cleaves the MdMYB73 transcript, dampening vacuolar proton pumps and malate transport, and lowering malic acid accumulation during ripening.
🍏 Malic acid is crucial to #apple #fruit quality.
Here, Zhang et al. report a regulatory cascade controlling malic acid accumulation, linking #jasmonate signaling and post-transcriptional regulation of fruit acidity.
🍎 doi.org/10.1111/jipb...
@wileyecology.bsky.social
#PlantSci #JIPB #microRNA
Model showing the two distinct response zones. F. oxysporum infects an A. thaliana root tip via the meristematic zone, where it colonizes the vasculature (purple cells=colonized zone). The tissue around this zone undergoes immediate programmed cell death (dark gray cells). As the colonization front (light purple line) progresses in the vasculature, so does a cell death front (black line) across all tissues. In an attempt to prevent the fungus from infecting more tissue and spreading through the vasculature to all parts of the plant, the plant triggers the HR in a small, spatially confined group of cells immediately adjacent to the colonization front (yellow cells), the HR zone. HR is activated by SA in combination with ET, ROS, and DAMP signaling. Slightly removed from the HR and colonized zones, the plant launches a second line of defense to combat the spread of the pathogen in the defense response zone (orange cells). This response is dependent on WRKY11 and JA/ET biosynthesis and signaling. JA and SA are mutually antagonistic, thereby establishing the two spatially separate zones of distinct action. WRKY11 is furthermore a negative regulator of basal resistance. Upon colonization by F. oxysporum, the plant therefore represses WRKY11 in all tissues other than the vasculature, therefore releasing basal resistance genes in these tissues from repression and allowing these cells to activate basal immunity in the case of spread of the infection. Long-distance signaling via the PEP pathway further contributes to this.
The Eu flag and the sentence Co-funded by the European Union
We then used the reporters to create a first map of the plant immune system, based on local activation of #Phytohormones #Jasmonate #SalicylicAcid & #Ethylene in response to #Fusarium colonization.
shorturl.at/V3QWV
This work was completed @mpipz.bsky.social with @horizoneu.bsky.social funding.
📜 A multiprotein regulatory module, MED16–MBR1&2, controls MED25 homeostasis during jasmonate signaling
🧑🔬 Fangming Wu, Chuanlong Sun, Chuanyou Li, et al.
📔 @naturecomms.bsky.social
🔗 www.nature.com/articles/s41...
#️⃣ #PlantScience #PlantImmunity #Phytohormones #Jasmonate
📜 Long-term Exposure to Methyl Jasmonate Increases Myrosinases TGG1 and TGG2 in Arabidopsis coi1 and myc2,3,4 Mutants
🧑🔬 Mohamadreza Mirzaei, Kenji Yamada, et al.
📔 @biorxiv-plants.bsky.social
🔗 www.biorxiv.org/content/10.1...
#️⃣ #PlantScience #PlantImmunity #Phytohormones #Jasmonate
Antony Champion defending his HDR docentship at @ird_fr Montpellier #jasmonate #bioticstress #rice #IRD
