Katharina Markmann

Katharina Markmann
Aarhus University | AU · Centre for Carbonate Recognition and Signaling CARB

About

25
Publications
4,918
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1,646
Citations
Citations since 2016
5 Research Items
899 Citations
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
2016201720182019202020212022020406080100120140
Introduction
Skills and Expertise

Publications

Publications (25)
Article
Full-text available
Hydrophobic cell wall depositions in roots play a key role in plant development and interaction with the soil environment, as they generate barriers that regulate bidirectional nutrient flux. Techniques to label the respective polymers are emerging, but are efficient only in thin roots or sections. Moreover, simultaneous imaging of the barrier cons...
Article
Full-text available
Intercellular communication in plants coordinates cellular functions during growth and development, and in response to environmental cues. RNAs figure prominently among the mobile signaling molecules used. Many hundreds of RNA species move over short and long distances, and can be mutually exchanged in biotic interactions. Understanding the specifi...
Article
Keeping the doors open for symbiosis Nitrogen fixation by legumes results from a symbiotic partnership between plant and microbes. These together elaborate nodules on the plant roots that house the bacteria. Tsikou et al. identified a microRNA made in the aboveground shoots of Lotus japonicus that translocates to the plant's roots. In the roots, th...
Article
Full-text available
LTR retrotransposons are closely related to retroviruses and their activities shape eukaryotic genomes. Here, we present a complete Lotus japonicus insertion mutant collection generated by identification of 640,653 new insertion events following de novo activation of the LTR element Lotus retrotransposon 1 (LORE1) ( http : // lotus .au . dk). Inser...
Article
Full-text available
Background: Establishment and maintenance of mutualistic plant-microbial interactions in the rhizosphere and within plant roots involve several root cell types. The processes of host-microbe recognition and infection require complex signal exchange and activation of downstream responses. These molecular events coordinate host responses across root...
Article
Legumes interact with rhizobial bacteria to form nitrogen-fixing root nodules. Host signalling following mutual recognition ensures a specific response, but is only partially understood. Focusing on the stage of epidermal infection with Mesorhizobium loti, we analysed endogenous small RNAs (sRNAs) of the model legume Lotus japonicus to investigate...
Article
Full-text available
Legumes overcome nitrogen shortage by developing root nodules in which symbiotic bacteria fix atmospheric nitrogen in exchange for host-derived carbohydrates and mineral nutrients. Nodule development involves the distinct processes of nodule organogenesis, bacterial infection and the onset of nitrogen fixation. These entail profound, dynamic gene e...
Article
To sample the natural variation in genes controlling compatibility in the legume-rhizobium symbiosis, we isolated rhizobia from nodules of endemic Lotus species from 21 sites across Europe. The majority of isolates were identified as Mesorhizobium- or Bradyrhizobium-related and formed nitrogen-fixing root nodules on Lotus corniculatus and L. pendun...
Article
Full-text available
High-throughput sequencing currently generates a wealth of small RNA (sRNA) data, making data mining a topical issue. Processing of these large data sets is inherently multidimensional as length, abundance, sequence composition, and genomic location all hold clues to sRNA function. Analysis can be challenging because the formulation and testing of...
Article
Full-text available
We have established tools for forward and reverse genetic analysis of the legume Lotus (Lotus japonicus). A structured population of M2 progeny of 4,904 ethyl methanesulfonate-mutagenized M1 embryos is available for single nucleotide polymorphism mutation detection, using a TILLING (for Targeting Induced Local Lesions IN Genomes) protocol. Scanning...
Article
Plants form diverse symbioses with nitrogen-fixing bacteria to gain access to ammonium, a product of the prokaryote-exclusive enzyme nitrogenase. Improving the symbiotic effectiveness of crop plants like maize, wheat or rice is a highly topical challenge and could help reduce the need for energy-intense nitrogen fertilizer in staple food production...
Article
Full-text available
The initiation of intracellular infection of legume roots by symbiotic rhizobia bacteria and arbuscular mycorrhiza (AM) fungi is preceded by the induction of calcium signatures in and around the nucleus of root epidermal cells. Although a calcium and calmodulin-dependent kinase (CCaMK) is a key mediator of symbiotic root responses, the decoding of...
Article
Full-text available
Author Summary As an adaptation to nutrient limitations in terrestrial ecosystems, most plants form Arbuscular Mycorrhiza (AM), which is a symbiotic relationship between phosphate-delivering fungi and plant roots that dates back to the earliest land plants. More recently, a small group including the legumes and close relatives has evolved the abil...
Article
Full-text available
Root endosymbioses vitally contribute to plant nutrition and fitness worldwide. Nitrogen-fixing root nodulation, confined to four plant orders, encompasses two distinct types of associations, the interaction of legumes (Fabales) with rhizobia bacteria and actinorhizal symbioses, where the bacterial symbionts are actinomycetes of the genus Frankia....
Data
Full-text available
LjSYMRK Restores Nodulation and AM Formation in Medicago dmi2 5P Mutants Transformation assay and selection were as in Figure 3. (A, B, K, and L) Me. truncatula (Medicago) dmi2 5P roots transformed with the respective control vector lacking an LjSYMRK expression cassette. (C–F, M, and N) Medicago wild-type and (G–J, O and P) dmi2 5P roots transform...
Data
SYMRK Kinase Regions Share Several Defining Conserved Amino Acid Motifs, Which Are Absent in Similar Sequences in Arabidopsis and Rice Black shading indicates amino acid residues identical in all sequences, residues found in at least 50% of the sequences are shaded gray. Bars delimit predicted SYMRK protein domains. Dark blue, conserved extracellul...
Data
Primer Sequences (106 KB DOC)
Data
Full-text available
Tomato and Rice SYMRK Restore AM Symbiosis in Lotus symrk-10 Mutants, but Cannot or Only Partially Complement Bacterial Endosymbiosis Formation Transformation assay and selection were as in Figure 3. (A–D) Lotus symrk-10 roots transformed with the respective control vector lacking a SYMRK expression cassette. (E–L) Lotus wild-type (E–H) and symrk-1...
Chapter
Full-text available
Like the two important crop legumes soybean and common bean, the model legume Lotus japonicus develops determinate root nodules. L. japonicus is normally infected through root hair infection threads in a process closely synchronised with the progressing primordial cell divisions and organ development. Recent studies of symbiotic mutants have howeve...
Conference Paper
Characterization of monogenic symbiotic mutant phenotypes found by forward genetic screens has been instrumental for establishing the framework of genes coordinating nodule formation in the model legumes Lotus japonicus and Medicago truncatula. To complement this approach it is now important to investigate more complex traits governing symbiosis. W...
Conference Paper
Characterization of monogenic symbiotic mutant phenotypes found by forward genetic screens has been instrumental for establishing the framework of genes coordinating nodule formation in the model legumes Lotus japonicus and Medicago truncatula. To complement this approach it is now important to investigate more complex traits governing symbiosis. W...

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