Caroline Gutjahr - Arbuscular mycorrhiza development and function

  • Date: Apr 18, 2018
  • Time: 14:00 - 15:30
  • Speaker: Caroline Gutjahr
  • Location: Central Building
  • Room: Seminar Room
  • Host: Mark Stitt

Arbuscular mycorrhiza symbioses between most land plants and fungi of the glomeromycota improve plant performance because the fungi deliver mineral nutrients to their hosts. In return, the fungi receive photosynthetically fixed carbon. It has long been believed that the fungi are only fed with carbohydrates but we and others have recently discovered that plants serve their symbionts also with lipids and that fungal development and growth depends on this lipid source. Root colonization by arbuscular mycorrhiza fungi involves distinct developmental steps that are largely under plant control and can be genetically separated by plant mutants. These steps include fascinating plant cell rearrangements that precede differentiation of fungal hyphae into particular shapes inside these plant cells. In my research group, we use a combination of genetic, physiological, biochemical and cell biological approaches to uncover and understand the plant molecular mechanisms, which regulate and execute these plant cell rearrangements for fungal accommodation. Plants regulate the extend of colonization according to their physiological state. For example, at high phosphate levels or insufficient light availability, root colonization is suppressed. It is our long-term goal to unravel the molecular mechanisms, which interconnect plant physiology with arbuscular mycorrhiza development, to understand how plants orchestrate AM symbiosis with their physiological needs under changing environmental conditions. My presentation will focus on our recent progress in understanding the role of plant hormone signaling and transcriptional regulation in arbuscular mycorrhiza development and function.

Keymer A, Pimprikar P, Wewer V, Huber C, Brands M, Bucerius SL, Delaux PM, Klingl V, von
Roepenack-Lahaye E, Wang TL, Eisenreich W, Dörmann P, Parniske M, Gutjahr C (2017)
Lipid transfer from plants to arbuscular mycorrhiza fungi. eLife 6. pii: e29107.

Pimprikar P, Carbonnel S, Paries M, Katzer K, Klingl V, Bohmer MJ, Karl L, Floss DS, Harrison MJ,
Parniske M, Gutjahr C (2016) A CCaMK-CYCLOPS-DELLA complex activates transcription
of RAM1 to regulate arbuscule branching. Current Biology 26: 987-998.

Gutjahr C, Gobbato E, Choi J, Riemann M, Johnston MG, Summers W, Carbonnnel S, Mansfield
C, Yang SY, Nadal M, Acosta IF, Takano M, Jiao WB, Schneeberger K, Kelly KA, Paszkowski U
(2015) Rice perception of arbuscular mycorrhizal fungi requires the karrikin receptor
complex. Science 350: 1521-1524.

Gutjahr C, Sawers RJH, Marti G, Andres-Hernandez L, Yang SY, Casieri L, Angliker H, Oakeley E,
Wolfender JL, Abreu-Goodger C, Paszkowski U (2015) Transcriptome diversity among rice root-
types during asymbiosis and interaction with arbuscular mycorrhizal fungi. PNAS 112: 6754-6759.

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