Robert Koller
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View article: Photosynthate distribution determines spatial patterns in the rhizosphere microbiota of the maize root system
Photosynthate distribution determines spatial patterns in the rhizosphere microbiota of the maize root system Open
The spatial variation and underlying mechanisms of pattern formation in the rhizosphere microbiome are not well understood. We demonstrate that specific patterns in the distribution of recently fixed carbon within the plant root system inf…
View article: A non-rectifying potassium channel increases cassava drought tolerance and storage root yield
A non-rectifying potassium channel increases cassava drought tolerance and storage root yield Open
Cassava ( Manihot esculenta ) is an important crop for food security in the tropics, particularly for smallholder farmers in sub-Saharan Africa, where yields are often severely limited by pathogen pressure, nutrient deficiency, and water s…
View article: Seed-to-plant-tracking: automated phenotyping of seeds and corresponding plants of Arabidopsis
Seed-to-plant-tracking: automated phenotyping of seeds and corresponding plants of Arabidopsis Open
Plants adapt seed traits in response to different environmental triggers, supporting the survival of the next generation. To elucidate the mechanistic understanding of such adaptations it is important to characterize the distributions of s…
View article: phenoPET: Observing Carbon Transport within Individual Plants
phenoPET: Observing Carbon Transport within Individual Plants Open
Individual plants vary in their ability to respond to environmental changes. For dynamic responses in plants, long-distance carbon (C) transport is required to support growth. Therefore, investigating C allocation in plants is crucial for …
View article: Root growth dynamics and allocation as a response to rapid and local changes in soil moisture
Root growth dynamics and allocation as a response to rapid and local changes in soil moisture Open
Roots exhibit plasticity in morphology and physiology when exposed to fluctuating nutrient and water availability. However, the dynamics of daily timescale adjustments to changes in water availability are unclear, and experimental evidence…
View article: The data acquisition system of phenoPET
The data acquisition system of phenoPET Open
The PET scanner pheno PET is a system dedicated for plant research developed and used for phenotyping studies at the Research Center in Jülich. The detectors consist of LYSO scintillators and Philips digital silicon photomultipliers. A cen…
View article: Root growth dynamics and allocation as a response to rapid and local changes in soil moisture
Root growth dynamics and allocation as a response to rapid and local changes in soil moisture Open
Roots exhibit plasticity in morphology and physiology when exposed to fluctuating nutrient and water availability. However, the dynamics of daily time-scale adjustments to changes in water availability are unclear and experimental evidence…
View article: Amphicarpic development in <i>Cardamine chenopodiifolia</i>
Amphicarpic development in <i>Cardamine chenopodiifolia</i> Open
Summary Amphicarpy is an unusual trait where two fruit types develop on the same plant: one above and the other belowground. This trait is not found in conventional model species. Therefore, its development and molecular genetics remain un…
View article: Amphicarpic development in the emerging model organism<i>Cardamine chenopodiifolia</i>
Amphicarpic development in the emerging model organism<i>Cardamine chenopodiifolia</i> Open
Summary Amphicarpy is an unusual trait where two fruit types develop: one above and the other below ground. This trait is not found in conventional model species, therefore, its development and molecular genetics remain under-studied. Here…
View article: Setup and characterisation according to NEMA NU 4 of the phenoPET scanner, a PET system dedicated for plant sciences
Setup and characterisation according to NEMA NU 4 of the phenoPET scanner, a PET system dedicated for plant sciences Open
Objective. The pheno PET system is a plant dedicated positron emission tomography (PET) scanner consisting of fully digital photo multipliers with lutetium–yttrium oxyorthosilicate crystals and located inside a custom climate chamber. Here…
View article: Diurnal water fluxes and growth patterns in potato tubers under drought stress
Diurnal water fluxes and growth patterns in potato tubers under drought stress Open
Background and aims Potato tubers comprise 83% water at harvest, but surprisingly few studies address tuber water relations in drying soil. This study aims to understand whether soil drying alters tuber water fluxes and their effect on tub…
View article: Arabidopsis histone deacetylase HD2A and HD2B regulate seed dormancy by repressing DELAY OF GERMINATION 1
Arabidopsis histone deacetylase HD2A and HD2B regulate seed dormancy by repressing DELAY OF GERMINATION 1 Open
Seed dormancy is a crucial developmental transition that affects the adaption and survival of plants. Arabidopsis DELAY OF GERMINATION 1 (DOG1) is known as a master regulator of seed dormancy. However, although several upstream factors of …
View article: Monitoring spatial and temporal carbon dynamics in the plant soil system by co-registration of Magnetic Resonance Imaging and Positron Emission Tomography for image guided sampling
Monitoring spatial and temporal carbon dynamics in the plant soil system by co-registration of Magnetic Resonance Imaging and Positron Emission Tomography for image guided sampling Open
Individual plants vary in their ability to respond to environmental changes. The plastic response of a plant enhances its ability to avoid environmental constraints, and hence supports growth, reproduction, and evolutionary and agricultura…
View article: Diurnal water fluxes and growth patterns in potato tubers under drought stress
Diurnal water fluxes and growth patterns in potato tubers under drought stress Open
Background and Aims: Potato tubers comprise 83 % water at harvest, but surprisingly few studies address tuber water relations in drying soil. This study aims to understand whether soil drying alters water tuber fluxes and their effect on t…
View article: Carbon dynamics in nodulated pea root systems: 3D imaging and quantification with short lived isotopes
Carbon dynamics in nodulated pea root systems: 3D imaging and quantification with short lived isotopes Open
In natural ecosystems and low-input agriculture systems often the main source of nitrogen is biological nitrogen fixation by symbiotic coexistence with root colonizing microorganisms such as in root nodules in legumes. In return for this n…
View article: Improved non-invasive root detection in soil using low noise magnetic resonance images
Improved non-invasive root detection in soil using low noise magnetic resonance images Open
Using magnetic resonance imaging (MRI), our established root phenotyping platform (van Dusschoten et al., 2016) can visualize and analyze plant roots in natural soil nondestructively (Pflugfelder et al., 2017). Using plant pots with 9 cm d…
View article: Dynamics and reversibility of global hydropatterning in a split-root experiment
Dynamics and reversibility of global hydropatterning in a split-root experiment Open
<p>Plant water uptake is often a limiting factor for above-ground productivity and therefore models of soil-vegetation-atmosphere transfer strongly rely on a precise characterization of the spatial organization of root systems. Howev…
View article: In Vivo Imaging and Quantification of Carbon Tracer Dynamics in Nodulated Root Systems of Pea Plants
In Vivo Imaging and Quantification of Carbon Tracer Dynamics in Nodulated Root Systems of Pea Plants Open
Legumes associate with root colonizing rhizobia that provide fixed nitrogen to its plant host in exchange for recently fixed carbon. There is a lack of understanding of how individual plants modulate carbon allocation to a nodulated root s…
View article: Bridging Microbial Functional Traits With Localized Process Rates at Soil Interfaces
Bridging Microbial Functional Traits With Localized Process Rates at Soil Interfaces Open
In this review, we introduce microbially-mediated soil processes, players, their functional traits, and their links to processes at biogeochemical interfaces [e.g., rhizosphere, detritusphere, (bio)-pores, and aggregate surfaces]. A concep…
View article: <i>ENHANCED GRAVITROPISM 2</i> encodes a STERILE ALPHA MOTIF–containing protein that controls root growth angle in barley and wheat
<i>ENHANCED GRAVITROPISM 2</i> encodes a STERILE ALPHA MOTIF–containing protein that controls root growth angle in barley and wheat Open
Significance To date, the potential of utilizing root traits in plant breeding remains largely untapped. In this study, we cloned and characterized the ENHANCED GRAVITROPISM2 ( EGT2 ) gene of barley that encodes a STERILE ALPHA MOTIF domai…
View article: In vivo imaging and quantification of carbon tracer dynamics in nodulated root systems of pea plants
In vivo imaging and quantification of carbon tracer dynamics in nodulated root systems of pea plants Open
Legumes associate with root colonizing rhizobia that provide fixed nitrogen to its plant host in exchange for recently fixed carbon. There is a lack in understanding how individual plants modulate carbon allocation to a nodulated root syst…
View article: Spatiotemporal Dynamics of Maize (Zea mays L.) Root Growth and Its Potential Consequences for the Assembly of the Rhizosphere Microbiota
Spatiotemporal Dynamics of Maize (Zea mays L.) Root Growth and Its Potential Consequences for the Assembly of the Rhizosphere Microbiota Open
Numerous studies have shown that plants selectively recruit microbes from the soil to establish a complex, yet stable and quite predictable microbial community on their roots – their “microbiome.” Microbiome assembly is considered as a key…
View article: <i>ENHANCED GRAVITROPISM 2</i>encodes a STERILE ALPHA MOTIVE containing protein that controls root growth angle in barley and wheat
<i>ENHANCED GRAVITROPISM 2</i>encodes a STERILE ALPHA MOTIVE containing protein that controls root growth angle in barley and wheat Open
The root growth angle defines how roots grow towards the gravity vector and is among the most important determinants of root system architecture. It controls water uptake capacity, nutrient use efficiency, stress resilience and as a conseq…