Annette Deubel - Academia.edu (original) (raw)

Papers by Annette Deubel

62. Deutsche Pflanzenschutztagung : Gesunde Pflanzen in Verantwortung für unsere Welt ; 21. - 23. September 2021, -Kurzfassungen der Vorträge und Poster-, 2021

Plant Nutrition, 2001

It is often postulated that microorganisms have a promotional effect on root exudation. To determ... more It is often postulated that microorganisms have a promotional effect on root exudation. To determine the influence on microbial colonisation in the rhizosphere on the release of nitrogen compounds spring wheat (Triticum aestivum) was grown for four weeks in pots containing a 5:1 mixture of soil and quartz sand under semi-sterile and unsterile conditions. 15N was applied three times to the shoots as 15NH3 for four hours. Plants were harvested after three days (tillering stage) and 28 days (shooting stage) respectively after the last labelling period. Total N and 15N were measured in shoots, roots, and soil compartments using an elemental analyser coupled with an emission spectrometer.

EGU General Assembly Conference Abstracts, Apr 1, 2018

Engineering in Life Sciences, 2005

Coastal sand dunes harbor a variety of free living and symbiotic microorganisms, which are adapte... more Coastal sand dunes harbor a variety of free living and symbiotic microorganisms, which are adapted to stress conditions such as temperature, salinity and pH. The current paper explores the ability of sole‐source‐carbon utilization by symbiotic rhizobia isolated from tropical coastal sand dune wild legumes. Fast‐growing rhizobia isolated from five legume plant species (Canavalia cathartica, Canavalia maritima, Crotalaria retusa, Crotalaria verrucosa, and Derris triflorum) grown on the two coastal sand dunes of the southwest coast of India (Someshwara, S1–S5; Padubidri, P1–P5) were assessed for sole‐carbon‐source utilization patterns based on BIOLOG GN2 microplate technique. All the isolates showed high extents of utilization of the different carbon sources within 24 h of incubation at 30 °C. Cluster analysis based on quantitative and qualitative utilization of a sole carbon source revealed two distinct clusters. Cluster I consists of four isolates (S1, P2, P4, and P5), of which P2 and P5 showed greater similarities. The cluster II encompasses six isolates (S2–S5, P1 and P3), among them S3 and S5 showed high similarities. Based on the utilization of six guilds by the isolates S1, S2, P1, and P2 (polymers, carbohydrates, carboxylic acids, amides and amines, amino acids and miscellaneous), S2 and P1 exhibited high functional diversity. Principal component analysis revealed a close catabolic potential between the isolates S5 and P1; S1 and P3; S3, P2, and P5. The symbiotic rhizobia of the southwest coastal sand dune wild legumes of India studied might serve as novel inoculants to achieve legume production through nitrogen fixation under the varied conditions of tropical soils. These rhizobia were able to utilize a wide range of carbon sources, possessed functional diversity, withstood extreme conditions (temperature, salinity, pH), exhibited non‐host specificity and induced high biomass in edible legumes.

Frontiers in soil science, Mar 31, 2022

Application of agrochemicals and mechanization enabled increasing agricultural productivity yet c... more Application of agrochemicals and mechanization enabled increasing agricultural productivity yet caused various environmental and soil health-related problems. Agricultural practices affect soil microorganisms, which are the key players of many ecosystem processes. However, less is known about whether this effect differs between time points. Therefore, soil was sampled in winter (without crop) and in summer (in the presence of maize) from a long-term field experiment (LTE) in Bernburg (Germany) managed either under cultivator tillage (CT) or moldboard plow (MP) in combination with either intensive nitrogen (N)-fertilization and pesticides (Int) or extensive reduced N-fertilization without fungicides (Ext), respectively. High-throughput sequencing of 16S rRNA gene and fungal ITS2 amplicons showed that changes in the microbial community composition were correlated to differences in soil chemical properties caused by tillage practice. Microbial communities of soils sampled in winter differed only depending on the tillage practice while, in summer, also a strong effect of the fertilization intensity was observed. A small proportion of microbial taxa was shared between soils from the two sampling times, suggesting the existence of a stable core microbiota at the LTE. In general, taxa associated with organic matter decomposition (such as Actinobacteria, Bacteroidetes, Rhizopus, and Exophiala) had a higher relative abundance under CT. Among the taxa with significant changes in relative abundances due to different long-term agricultural practices were putative pathogenic (e.g., Gibellulopsis and Gibberella) and beneficial microbial genera (e.g., Chitinophagaceae, Ferruginibacter, and Minimedusa). In summary, this study suggests that the effects of long-term agricultural management practices on the soil microbiota are influenced by the soil sampling time, and this needs to be kept in mind in future studies for the interpretation of field data.

Journal of applied botany and food quality, 2008

Effects of the hormones indole-3-acetic acid (IAA), gibberellic acid (GA 3 ), and trans -zeatin (... more Effects of the hormones indole-3-acetic acid (IAA), gibberellic acid (GA 3 ), and trans -zeatin ( t -Z) on growth, P status and rhizosphere processes of maize (Zea mays L., cv. 'Bezemara') were investigated in a pot experiment at two levels of phosphorus availability (+P: water soluble phosphate and -P: sparingly soluble tricalcium phosphate). Six weeks after seed germination, plants were harvested and analysed for dry weight, shoot length, root surface, P concentration, acid phosphatases activity (acid Pase) in shoot and rhizosphere and the content of carboxylic acids and sugars in the rhizosphere. ANOVA was used to estimate the effects of treatments on measured parameters. Hormone application via rhizosphere had a highly significant effect on the growth of whole plants, their P status and rhizosphere processes. GA 3 and t -Z promoted quantitatively shoot and root growth and morphological changes, whereas IAA affected the chemical composition of the rhizosphere. In several ...

Pflanzliche Stoffaufnahme und mikrobielle Wechselwirkungen in der Rhizosphäre, 1996

Die Zusammensetzung der Zuckerfraktion organischer Wurzelabscheidungen hoherer Pflanzen hangt in ... more Die Zusammensetzung der Zuckerfraktion organischer Wurzelabscheidungen hoherer Pflanzen hangt in entscheidendem Mase von deren Phosphaternahrung ab. Bei Erbsen der Sorte Grapis ging unter Phosphatmangel vor allem der Anteil Glucose, welcher bei optimaler P-Ernahrung nahezu 50% ausmacht, zugunsten von Galactose, Xylose, Ribose und Fucose zuruck. Der Pseudomonas fluorescens- Stamm PsIA12 konnte in vitro mit Glucose als C-Quelle signifikant mehr Tricalciumphosphat mobilisieren als mit allen anderen Zuckern. Dagegen zeigte der Pantoea agglomerans-Stamm D 5/23 das hochste Calciumphosphatlosungsvermogen mit den Zuckern, deren Anteil in Wurzelabscheidungen von Phosphatmangelpflanzen zunimmt.

Durchwurzelung, Rhizodeposition und Pflanzenverfügbarkeit von Nährstoffen und Schwermetallen, 2002

Interactions between higher plants and microorganisms play an essential role in the nutrient supp... more Interactions between higher plants and microorganisms play an essential role in the nutrient supply of higher plants. Therefore bacterial strains which are able to fix atmospheric nitrogen, to mobilize soil nutrients and/or produce phytohormones are used as biofertilizers particularly in countries with limited mineral fertilizer use and unfavourable soil pH.

Journal of Plant Nutrition and Soil Science, 2000

Root deposits of higher plants play an important role in the mobilization of different soil nutri... more Root deposits of higher plants play an important role in the mobilization of different soil nutrients, e.g. phosphates

Zeitschrift für Pflanzenernährung und Bodenkunde, 1998

... One indicator for this situation is the existence of many different methods for character-izi... more ... One indicator for this situation is the existence of many different methods for character-izing the available P like double lactate P (DL) (Thun, 1955), Ca-acetate-lactate P (CAL-P) (Schiiller, 1969),Olsen P (Olsen et al., 1954), mixed cation and anion resin extract-able P ...

Archives of Agronomy and Soil Science, 2002

ABSTRACT

62. Deutsche Pflanzenschutztagung : Gesunde Pflanzen in Verantwortung für unsere Welt ; 21. - 23. September 2021, -Kurzfassungen der Vorträge und Poster-, 2021

Plant Nutrition, 2001

It is often postulated that microorganisms have a promotional effect on root exudation. To determ... more It is often postulated that microorganisms have a promotional effect on root exudation. To determine the influence on microbial colonisation in the rhizosphere on the release of nitrogen compounds spring wheat (Triticum aestivum) was grown for four weeks in pots containing a 5:1 mixture of soil and quartz sand under semi-sterile and unsterile conditions. 15N was applied three times to the shoots as 15NH3 for four hours. Plants were harvested after three days (tillering stage) and 28 days (shooting stage) respectively after the last labelling period. Total N and 15N were measured in shoots, roots, and soil compartments using an elemental analyser coupled with an emission spectrometer.

EGU General Assembly Conference Abstracts, Apr 1, 2018

Engineering in Life Sciences, 2005

Coastal sand dunes harbor a variety of free living and symbiotic microorganisms, which are adapte... more Coastal sand dunes harbor a variety of free living and symbiotic microorganisms, which are adapted to stress conditions such as temperature, salinity and pH. The current paper explores the ability of sole‐source‐carbon utilization by symbiotic rhizobia isolated from tropical coastal sand dune wild legumes. Fast‐growing rhizobia isolated from five legume plant species (Canavalia cathartica, Canavalia maritima, Crotalaria retusa, Crotalaria verrucosa, and Derris triflorum) grown on the two coastal sand dunes of the southwest coast of India (Someshwara, S1–S5; Padubidri, P1–P5) were assessed for sole‐carbon‐source utilization patterns based on BIOLOG GN2 microplate technique. All the isolates showed high extents of utilization of the different carbon sources within 24 h of incubation at 30 °C. Cluster analysis based on quantitative and qualitative utilization of a sole carbon source revealed two distinct clusters. Cluster I consists of four isolates (S1, P2, P4, and P5), of which P2 and P5 showed greater similarities. The cluster II encompasses six isolates (S2–S5, P1 and P3), among them S3 and S5 showed high similarities. Based on the utilization of six guilds by the isolates S1, S2, P1, and P2 (polymers, carbohydrates, carboxylic acids, amides and amines, amino acids and miscellaneous), S2 and P1 exhibited high functional diversity. Principal component analysis revealed a close catabolic potential between the isolates S5 and P1; S1 and P3; S3, P2, and P5. The symbiotic rhizobia of the southwest coastal sand dune wild legumes of India studied might serve as novel inoculants to achieve legume production through nitrogen fixation under the varied conditions of tropical soils. These rhizobia were able to utilize a wide range of carbon sources, possessed functional diversity, withstood extreme conditions (temperature, salinity, pH), exhibited non‐host specificity and induced high biomass in edible legumes.

Frontiers in soil science, Mar 31, 2022

Application of agrochemicals and mechanization enabled increasing agricultural productivity yet c... more Application of agrochemicals and mechanization enabled increasing agricultural productivity yet caused various environmental and soil health-related problems. Agricultural practices affect soil microorganisms, which are the key players of many ecosystem processes. However, less is known about whether this effect differs between time points. Therefore, soil was sampled in winter (without crop) and in summer (in the presence of maize) from a long-term field experiment (LTE) in Bernburg (Germany) managed either under cultivator tillage (CT) or moldboard plow (MP) in combination with either intensive nitrogen (N)-fertilization and pesticides (Int) or extensive reduced N-fertilization without fungicides (Ext), respectively. High-throughput sequencing of 16S rRNA gene and fungal ITS2 amplicons showed that changes in the microbial community composition were correlated to differences in soil chemical properties caused by tillage practice. Microbial communities of soils sampled in winter differed only depending on the tillage practice while, in summer, also a strong effect of the fertilization intensity was observed. A small proportion of microbial taxa was shared between soils from the two sampling times, suggesting the existence of a stable core microbiota at the LTE. In general, taxa associated with organic matter decomposition (such as Actinobacteria, Bacteroidetes, Rhizopus, and Exophiala) had a higher relative abundance under CT. Among the taxa with significant changes in relative abundances due to different long-term agricultural practices were putative pathogenic (e.g., Gibellulopsis and Gibberella) and beneficial microbial genera (e.g., Chitinophagaceae, Ferruginibacter, and Minimedusa). In summary, this study suggests that the effects of long-term agricultural management practices on the soil microbiota are influenced by the soil sampling time, and this needs to be kept in mind in future studies for the interpretation of field data.

Journal of applied botany and food quality, 2008

Effects of the hormones indole-3-acetic acid (IAA), gibberellic acid (GA 3 ), and trans -zeatin (... more Effects of the hormones indole-3-acetic acid (IAA), gibberellic acid (GA 3 ), and trans -zeatin ( t -Z) on growth, P status and rhizosphere processes of maize (Zea mays L., cv. 'Bezemara') were investigated in a pot experiment at two levels of phosphorus availability (+P: water soluble phosphate and -P: sparingly soluble tricalcium phosphate). Six weeks after seed germination, plants were harvested and analysed for dry weight, shoot length, root surface, P concentration, acid phosphatases activity (acid Pase) in shoot and rhizosphere and the content of carboxylic acids and sugars in the rhizosphere. ANOVA was used to estimate the effects of treatments on measured parameters. Hormone application via rhizosphere had a highly significant effect on the growth of whole plants, their P status and rhizosphere processes. GA 3 and t -Z promoted quantitatively shoot and root growth and morphological changes, whereas IAA affected the chemical composition of the rhizosphere. In several ...

Pflanzliche Stoffaufnahme und mikrobielle Wechselwirkungen in der Rhizosphäre, 1996

Die Zusammensetzung der Zuckerfraktion organischer Wurzelabscheidungen hoherer Pflanzen hangt in ... more Die Zusammensetzung der Zuckerfraktion organischer Wurzelabscheidungen hoherer Pflanzen hangt in entscheidendem Mase von deren Phosphaternahrung ab. Bei Erbsen der Sorte Grapis ging unter Phosphatmangel vor allem der Anteil Glucose, welcher bei optimaler P-Ernahrung nahezu 50% ausmacht, zugunsten von Galactose, Xylose, Ribose und Fucose zuruck. Der Pseudomonas fluorescens- Stamm PsIA12 konnte in vitro mit Glucose als C-Quelle signifikant mehr Tricalciumphosphat mobilisieren als mit allen anderen Zuckern. Dagegen zeigte der Pantoea agglomerans-Stamm D 5/23 das hochste Calciumphosphatlosungsvermogen mit den Zuckern, deren Anteil in Wurzelabscheidungen von Phosphatmangelpflanzen zunimmt.

Durchwurzelung, Rhizodeposition und Pflanzenverfügbarkeit von Nährstoffen und Schwermetallen, 2002

Interactions between higher plants and microorganisms play an essential role in the nutrient supp... more Interactions between higher plants and microorganisms play an essential role in the nutrient supply of higher plants. Therefore bacterial strains which are able to fix atmospheric nitrogen, to mobilize soil nutrients and/or produce phytohormones are used as biofertilizers particularly in countries with limited mineral fertilizer use and unfavourable soil pH.

Journal of Plant Nutrition and Soil Science, 2000

Root deposits of higher plants play an important role in the mobilization of different soil nutri... more Root deposits of higher plants play an important role in the mobilization of different soil nutrients, e.g. phosphates

Zeitschrift für Pflanzenernährung und Bodenkunde, 1998

... One indicator for this situation is the existence of many different methods for character-izi... more ... One indicator for this situation is the existence of many different methods for character-izing the available P like double lactate P (DL) (Thun, 1955), Ca-acetate-lactate P (CAL-P) (Schiiller, 1969),Olsen P (Olsen et al., 1954), mixed cation and anion resin extract-able P ...

Archives of Agronomy and Soil Science, 2002

ABSTRACT