Unser 10. Leibniz Plant Biochemistry Symposium am 7. und 8. Mai war ein großer Erfolg. Thematisch ging es in diesem Jahr um neue Methoden und Forschungsansätze der Naturstoffchemie. Die exzellenten Vorträge über Wirkstoffe…
Omanische Heilpflanze im Fokus der Phytochemie IPB-Wissenschaftler und Partner aus Dhofar haben jüngst die omanische Heilpflanze Terminalia dhofarica unter die phytochemische Lupe genommen. Die Pflanze ist reich an…
Geschmack ist vorhersagbar: Mit FlavorMiner. FlavorMiner heißt das Tool, das IPB-Chemiker und Partner aus Kolumbien jüngst entwickelt haben. Das Programm kann, basierend auf maschinellem Lernen (KI), anhand der…
Bucher, M.; Hause, B.; Krajinski, F.; Küster, H.;Through the doors of perception to function in arbuscular mycorrhizal symbiosesNew Phytol.204833-840(2014)DOI: 10.1111/nph.12862
The formation of an arbuscular mycorrhizal (AM) symbiosis is initiated by the bidirectional exchange of diffusible molecules. While strigolactone hormones, secreted from plant roots, stimulate hyphal branching and fungal metabolism, fungal short‐chain chitin oligomers as well as sulfated and nonsulfated lipochitooligosaccharides (s/nsMyc‐LCOs) elicit pre‐symbiosis responses in the host. Fungal LCO signals are structurally related to rhizobial Nod‐factor LCOs. Genome‐wide expression studies demonstrated that defined sets of genes were induced by Nod‐, sMyc‐ and nsMyc‐LCOs, indicating LCO‐specific perception in the pre‐symbiosis phase. During hyphopodium formation and the subsequent root colonization, cross‐talk between plant roots and AM fungi also involves phytohormones. Notably, gibberellins control arbuscule formation via DELLA proteins, which themselves serve as positive regulators of arbuscule formation. The establishment of arbuscules is accompanied by a substantial transcriptional and post‐transcriptional reprogramming of host roots, ultimately defining the unique protein composition of arbuscule‐containing cells. Based on cellular expression profiles, key checkpoints of AM development as well as candidate genes encoding transcriptional regulators and regulatory microRNAs were identified. Detailed functional analyses of promoters specified short motifs sufficient for cell‐autonomous gene regulation in cells harboring arbuscules, and suggested simultaneous, multi‐level regulation of the mycorrhizal phosphate uptake pathway by integrating AM symbiosis and phosphate starvation response signaling.