Julien Spielmann
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View article: Arabidopsis Microtubule-BRI1 Associated Proteins negatively regulate hypocotyl elongation by controlling brassinosteroid-dependent cortical microtubule reorientation
Arabidopsis Microtubule-BRI1 Associated Proteins negatively regulate hypocotyl elongation by controlling brassinosteroid-dependent cortical microtubule reorientation Open
Brassinosteroids (BRs) are steroid-type phytohormones that are essential for plant growth, development, and adaptation to environmental stresses. BRs are known to control microtubule (MT) orientation, which is pivotal for directional growt…
View article: Cis-regulatory elements co-opting core circadian clock regulator CCA1 underlie enhanced expression of HMA4 for metal hyperaccumulation in Arabidopsis halleri
Cis-regulatory elements co-opting core circadian clock regulator CCA1 underlie enhanced expression of HMA4 for metal hyperaccumulation in Arabidopsis halleri Open
The naturally selected extreme traits of zinc and cadmium hyperaccumulation and hypertolerance in Arabidopsis halleri depend on strongly elevated HEAVY METAL ATPase 4 (HMA4) transcript levels compared to those in the closely related Arabid…
View article: Canonical tyrosine‐based motifs are required for constitutive endocytosis and polarity of <scp>IRT1</scp> and contribute to metal uptake
Canonical tyrosine‐based motifs are required for constitutive endocytosis and polarity of <span>IRT1</span> and contribute to metal uptake Open
SUMMARY Endocytosis regulates the localization and abundance of plasma membrane proteins. Several endocytic mechanisms were shown to operate in plants. The plant metal transporter IRT1 was previously shown to undergo ubiquitin‐mediated end…
View article: Broad application of the ALFA tagging technology for in planta nanobody-based imaging and biochemical characterization of plant proteins
Broad application of the ALFA tagging technology for in planta nanobody-based imaging and biochemical characterization of plant proteins Open
Epitope tags are widely used for detecting, modifying, or purifying proteins of interest, but their range of application is often limited. Recently, the rationally designed ALFA tag and its ALFA nanobody have expanded the repertoire of epi…
View article: Broad application of plant protein tagging with ALFA tag for nanobody-based imaging and biochemical approaches
Broad application of plant protein tagging with ALFA tag for nanobody-based imaging and biochemical approaches Open
Summary Epitope tags are broadly used for detecting, modifying or purifying proteins of interest, but their breadth of application is often rather poor. Recently, the rationally designed ALFA tag and its ALFA Nanobody complements the reper…
View article: <i>Cis</i>-regulatory mutations co-opting circadian clock regulation underlie naturally selected extreme trait in<i>Arabidopsis halleri</i>
<i>Cis</i>-regulatory mutations co-opting circadian clock regulation underlie naturally selected extreme trait in<i>Arabidopsis halleri</i> Open
HEAVY METAL ATPase 4 ( HMA4 ) is required for the naturally selected traits of zinc/cadmium hyperaccumulation and hypertolerance of in Arabidopsis halleri . Cis -regulatory alterations and tandem triplication of AhHMA4 result in substantia…
View article: Reduced expression of <i>bZIP19</i> and <i>bZIP23</i> increases zinc and cadmium accumulation in <i>Arabidopsis halleri</i>
Reduced expression of <i>bZIP19</i> and <i>bZIP23</i> increases zinc and cadmium accumulation in <i>Arabidopsis halleri</i> Open
Zinc is an essential micronutrient for all living organisms. When challenged by zinc‐limiting conditions, Arabidopsis thaliana plants use a strategy centered on two transcription factors, bZIP19 and bZIP23, to enhance the expression of sev…
View article: Multilayered regulation of iron homeostasis in Arabidopsis
Multilayered regulation of iron homeostasis in Arabidopsis Open
Iron (Fe) is an essential micronutrient for plant growth and development due to its role in crucial processes such as photosynthesis and modulation of the redox state as an electron donor. While Fe is one of the five most abundant metals i…
View article: <scp><i>ZRT‐IRT‐Like PROTEIN</i></scp> <i>6</i>expression perturbs local ion homeostasis in flowers and leads to anther indehiscence and male sterility
<span><i>ZRT‐IRT‐Like PROTEIN</i></span> <i>6</i>expression perturbs local ion homeostasis in flowers and leads to anther indehiscence and male sterility Open
Metallic micronutrients are essential throughout the plant life cycle. Maintaining metal homeostasis in plant tissues requires a highly complex and finely tuned network controlling metal uptake, transport, distribution and storage. Zinc an…
View article: Dynamic Control of the High-Affinity Iron Uptake Complex in Root Epidermal Cells
Dynamic Control of the High-Affinity Iron Uptake Complex in Root Epidermal Cells Open
In plants, iron uptake from the soil is tightly regulated to ensure optimal growth and development. Iron absorption in Arabidopsis root epidermal cells requires the IRT1 transporter that also allows the entry of certain non-iron metals, su…
View article: The two copies of the zinc and cadmium<scp>ZIP6</scp>transporter of<i>Arabidopsis halleri</i>have distinct effects on cadmium tolerance
The two copies of the zinc and cadmium<span>ZIP6</span>transporter of<i>Arabidopsis halleri</i>have distinct effects on cadmium tolerance Open
Plants have the ability to colonize highly diverse environments. The zinc and cadmium hyperaccumulator Arabidopsis halleri has adapted to establish populations on soils covering an extreme range of metal availabilities. The A. halleri ZIP6…
View article: Intertwined metal homeostasis, oxidative and biotic stress responses in the Arabidopsis <i>frd3</i> mutant
Intertwined metal homeostasis, oxidative and biotic stress responses in the Arabidopsis <i>frd3</i> mutant Open
Summary FRD3 (FERRIC REDUCTASE DEFECTIVE 3) plays a major role in iron (Fe) and zinc (Zn) homeostasis in Arabidopsis. It transports citrate, which enables metal distribution in the plant. An frd3 mutant is dwarf and chlorotic and displays …