Stefan Hörtensteiner
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View article: Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in <i>Arabidopsis</i>
Side‐chain modifications of phyllobilins may not be essential for chlorophyll degradation in <i>Arabidopsis</i> Open
Disposing efficiently and safely chlorophyll derivatives during senescence requires a coordinated pathway that is well conserved throughout green plants. The PAO/phyllobilin pathway catalyzes the degradation of the chlorophyll during senes…
View article: Evolution of chlorophyll degradation is associated with plant transition to land
Evolution of chlorophyll degradation is associated with plant transition to land Open
SUMMARY Colonization of land by green plants (Viridiplantae) some 500 million years ago was made possible by large metabolic and biochemical adaptations. Chlorophyll, the central pigment of photosynthesis, is highly photo‐active. In order …
View article: Evolution of chlorophyll degradation is associated with plant transition to land
Evolution of chlorophyll degradation is associated with plant transition to land Open
Colonization of land by green plants (Viridiplantae) some 500 million years ago was made possible by large metabolic and biochemical adaptations. Chlorophyll, the central pigment of photosynthesis, is highly photo-active. In order to mitig…
View article: Haberlea darkness 2018 gene expression
Haberlea darkness 2018 gene expression Open
The desiccation-tolerant plant Haberlea rhodopensis can withstand months of darkness without any visible senescence. Here, we investigated the molecular mechanisms of this adaptation to prolonged (30 d) darkness and subsequent return to li…
View article: Haberlea darkness 2018 gene expression
Haberlea darkness 2018 gene expression Open
The desiccation-tolerant plant Haberlea rhodopensis can withstand months of darkness without any visible senescence. Here, we investigated the molecular mechanisms of this adaptation to prolonged (30 d) darkness and subsequent return to li…
View article: Pheophorbide <i>a</i> May Regulate Jasmonate Signaling during Dark-Induced Senescence
Pheophorbide <i>a</i> May Regulate Jasmonate Signaling during Dark-Induced Senescence Open
Chlorophyll degradation is one of the most visible signs of leaf senescence. During senescence, chlorophyll is degraded in the multistep pheophorbide a oxygenase (PAO)/phyllobilin pathway. This pathway is tightly regulated at the transcrip…
View article: Salinity in Autumn-Winter Season and Fruit Quality of Tomato Landraces
Salinity in Autumn-Winter Season and Fruit Quality of Tomato Landraces Open
Tomato landraces, originated by adaptive responses to local habitats, are considered a valuable resource for many traits of agronomic interest, including fruit nutritional quality. Primary and secondary metabolites are essential determinan…
View article: Mutations in the Arabidopsis ROL17/isopropylmalate synthase 1 locus alter amino acid content, modify the TOR network, and suppress the root hair cell development mutant lrx1
Mutations in the Arabidopsis ROL17/isopropylmalate synthase 1 locus alter amino acid content, modify the TOR network, and suppress the root hair cell development mutant lrx1 Open
The growth and development of organisms must be tightly controlled and adjusted to nutrient availability and metabolic activities. The Target of Rapamycin (TOR) network is a major control mechanism in eukaryotes and influences processes su…
View article: Pheophorbide <i>a</i>, a chlorophyll catabolite may regulate jasmonate signalling during dark-induced senescence in <i>Arabidopsis</i>
Pheophorbide <i>a</i>, a chlorophyll catabolite may regulate jasmonate signalling during dark-induced senescence in <i>Arabidopsis</i> Open
Chlorophyll degradation is one of the most visible landmarks of leaf senescence. During senescence, chlorophyll is degraded in the multi-step pheophorbide a oxygenase (PAO)/phyllobilin pathway, which is tightly regulated at the transcripti…
View article: Plastidial NAD-Dependent Malate Dehydrogenase: A Moonlighting Protein Involved in Early Chloroplast Development through Its Interaction with an FtsH12-FtsHi Protease Complex
Plastidial NAD-Dependent Malate Dehydrogenase: A Moonlighting Protein Involved in Early Chloroplast Development through Its Interaction with an FtsH12-FtsHi Protease Complex Open
Malate dehydrogenases (MDHs) convert malate to oxaloacetate using NAD(H) or NADP(H) as a cofactor. Arabidopsis thaliana mutants lacking plastidial NAD-dependent MDH (pdnad-mdh) are embryo-lethal, and constitutive silencing (miR-mdh-1) caus…
View article: Molecular Mechanisms Preventing Senescence in Response to Prolonged Darkness in a Desiccation-Tolerant Plant
Molecular Mechanisms Preventing Senescence in Response to Prolonged Darkness in a Desiccation-Tolerant Plant Open
The desiccation-tolerant plant Haberlea rhodopensis can withstand months of darkness without any visible senescence. Here, we investigated the molecular mechanisms of this adaptation to prolonged (30 d) darkness and subsequent return to li…
View article: OUP accepted manuscript
OUP accepted manuscript Open
Chlorophyll is the most abundant natural pigment on Earth and is the key component of photosynthesis, ultimately providing oxygen and energy for us all.The ability of chlorophyll to absorb sunlight and to convert solar to chemical energy i…
View article: Catalytic and structural properties of pheophytinase, the phytol esterase involved in chlorophyll breakdown
Catalytic and structural properties of pheophytinase, the phytol esterase involved in chlorophyll breakdown Open
During leaf senescence and fruit ripening, chlorophyll is degraded in a multistep pathway into linear tetrapyrroles called phyllobilins. A key feature of chlorophyll breakdown is the removal of the hydrophobic phytol chain that renders phy…
View article: The biochemistry and molecular biology of chlorophyll breakdown
The biochemistry and molecular biology of chlorophyll breakdown Open
Chlorophyll breakdown is one of the most obvious signs of leaf senescence and fruit ripening. The resulting yellowing of leaves can be observed every autumn, and the color change of fruits indicates their ripening state. During these proce…
View article: Discovery and reduction of nonspecific activities of the major herbicide-resistance gene BAR
Discovery and reduction of nonspecific activities of the major herbicide-resistance gene BAR Open
Herbicide resistance is a major trait of genetically modified (GM) crops. Currently, resistance to phosphinothricin (also known as glufosinate) is the second most widespread genetically engineered herbicide-resistance trait in crops after …
View article: Isolation and Detection of the Chlorophyll Catabolite Hydroxylating Activity from Capsicum annuum Chromoplasts
Isolation and Detection of the Chlorophyll Catabolite Hydroxylating Activity from Capsicum annuum Chromoplasts Open
Hydroxylation of chlorophyll catabolites at the so-called C32 position ( Hauenstein et al., 2016 ) is commonly found in all plant species analyzed to date. Here we describe an in vitro hydroxylation assay using Capsicum annuum chromoplast …
View article: A Role for TIC55 as a Hydroxylase of Phyllobilins, the Products of Chlorophyll Breakdown during Plant Senescence
A Role for TIC55 as a Hydroxylase of Phyllobilins, the Products of Chlorophyll Breakdown during Plant Senescence Open
Chlorophyll degradation is the most obvious hallmark of leaf senescence. Phyllobilins, linear tetrapyrroles that are derived from opening of the chlorin macrocycle by the Rieske-type oxygenase PHEOPHORBIDE a OXYGENASE (PAO), are the end pr…
View article: A liquid chromatography–mass spectrometry platform for the analysis of phyllobilins, the major degradation products of chlorophyll in <i>Arabidopsis thaliana</i>
A liquid chromatography–mass spectrometry platform for the analysis of phyllobilins, the major degradation products of chlorophyll in <i>Arabidopsis thaliana</i> Open
Summary During senescence, chlorophyll is broken down to a set of structurally similar, but distinct linear tetrapyrrolic compounds termed phyllobilins. Structure identification of phyllobilins from over a dozen plant species revealed that…
View article: Pheophytinase Knockdown Impacts Carbon Metabolism and Nutraceutical Content Under Normal Growth Conditions in Tomato
Pheophytinase Knockdown Impacts Carbon Metabolism and Nutraceutical Content Under Normal Growth Conditions in Tomato Open
Although chlorophyll (Chl) degradation is an essential biochemical pathway for plant physiology, our knowledge regarding this process still has unfilled gaps. Pheophytinase (PPH) was shown to be essential for Chl breakdown in dark-induced …