A5078163237- Plant responses to water stress
- Plant Molecular Biology Research
- Plant Stress Responses and Tolerance
- Plant nutrient uptake and metabolism
- Plant Reproductive Biology
- Coastal wetland ecosystem dynamics
- Polyamine Metabolism and Applications
- Photosynthetic Processes and Mechanisms
- Plant-Microbe Interactions and Immunity
- Postharvest Quality and Shelf Life Management
- Lipid metabolism and biosynthesis
- Legume Nitrogen Fixing Symbiosis
- Polysaccharides and Plant Cell Walls
- Plant tissue culture and regeneration
- Plant Genetic and Mutation Studies
- Rice Cultivation and Yield Improvement
- GABA and Rice Research
- Nitrogen and Sulfur Effects on Brassica
- Plant Physiology and Cultivation Studies
- Plant Water Relations and Carbon Dynamics
- Microtubule and mitosis dynamics
- Soybean genetics and cultivation
- Marine and coastal plant biology
- Light effects on plants
- Chromosomal and Genetic Variations
Kiel University
2015-2024
KU Leuven
2012
Heidelberg University
2012
Forschungs- und Entwicklungszentrum Fachhochschule Kiel (Germany)
2012
University of Waterloo
2012
Plant Industry
2010
ACT Government
2010
Institute of Botany
2010
Boise State University
2004
Universität Hamburg
1997-2003
Abstract Arabidopsis (Arabidopsis thaliana) RAP2.2 (At3g14230) is an APETALA2/ethylene response factor-type transcription factor that belongs to the same subfamily as rice (Oryza sativa) submergence tolerance gene SUB1A. expressed at constitutively high levels in roots and lower shoots, where it induced by darkness. Effector studies analysis of ethylene signal transduction mutants indicate shoots functions ethylene-controlled pathway. Overexpression resulted improved plant survival under...
Phytosulfokine (PSK) is perceived by the leucine-rich repeat receptor kinase PSKR1 and promotes growth in Arabidopsis thaliana. coexpressed with CYCLIC NUCLEOTIDE-GATED CHANNEL gene CNGC17. PSK protoplast expansion wild type but not cngc17. Protoplast likewise promoted cGMP a CNGC17-dependent manner. Furthermore, PSKR1-deficient protoplasts do expand response to are still responsive cGMP, suggesting that acts downstream of PSKR1. Mutating guanylate cyclase center impairs seedling growth,...
Significance Flooding due to extreme weather events can be highly detrimental plant development and yield. Speedy recovery following stress removal is an important determinant of tolerance, yet mechanisms regulating this remain largely uncharacterized. We identified a regulatory network in Arabidopsis thaliana that controls water loss senescence influence from prolonged submergence. Targeted control the molecular facilitating here could potentially improve performance crops flood-prone areas.
Deepwater rice (Oryza sativa) is adapted to survive conditions of severe flooding over extended periods time. During such adventitious roots develop provide water, nutrients, and anchorage. In the present study growth was induced by treatment with ethylene but not auxin, cytokinin, or gibberellin. Root elongation enhanced between 8 10 h after submergence. The population cells in S phase expression S-phase-specific histone H3 gene increased within 4 6 h. Within G2-phase increased. Cell-cycle...
Abstract In deepwater rice (Oryza sativa), adventitious root primordia initiate at the nodes as part of normal development. Emergence roots is dependent on flooding plant and mediated by ethylene action. Root growth was preceded induced death epidermal cells node external to tip primordium. Cell proceeded until epidermis split open. Through this crack eventually emerged. Induced confined nodal covering primordia. Our results suggest that process facilitates emergence prevents injury growing...
• Gas spaces (aerenchyma) form as an adaptation to submergence facilitate gas exchange. In rice (Oryza sativa), aerenchyma develop by cell death and lysis, which are poorly understood at the cellular level. Aerenchyma formation was studied in stems light microscopy. It analyzed response submergence, ethylene hydrogen peroxide (H2O2) treatment, MT2b::Tos17 mutant. O2·− detected with nitroblue tetrazolium epinephrine assay. H2O2 3,3′-diaminobenzidine. constitutively all internodes of...
Rice (Oryza sativa) forms adventitious root primordia at stem nodes during normal development. Root emergence is preceded by ethylene-induced, H(2)O(2)-mediated local death of epidermal cells. Exogenous H(2)O(2) or enhancement endogenous promoted cell in a dose-dependent manner. Inhibition NADPH oxidase lowered ethylene-induced rates. ethylene perception 1-methylcyclopropene did not abolish H(2)O(2)-induced death, indicating that acts downstream ethylene. Microarray studies cells undergo...
A central question in biology is how spatial information conveyed to locally establish a developmental program. Rice (Oryza sativa) can survive flash floods by the emergence of adventitious roots from stem. Epidermal cells that overlie root primordia undergo cell death facilitate emergence. Root growth and epidermal are both controlled ethylene. This study aimed identify signal responsible for control death. correlated with proximity wild-type ADVENTITIOUS ROOTLESS1 plants, indicating emits...
• Phytosulfokine-α (PSK-α) is a disulfated pentapeptide described to act as growth factor in suspension cells. In this study, the involvement of PSK signaling through receptor gene AtPSKR1 Arabidopsis root was assessed. Expression studies precursor genes and were performed roots with RT-PCR P:GUS analyses. Root elongation, lateral formation, cell production elongation analyzed wild-type (wt) knockout mutant Atpskr1-T treated or without synthetic PSK-α. Phytosulfokine are differentially...
Abstract The concept of system 1 and 2 ethylene biosynthesis during climacteric fruit ripening was initially described four decades ago. Although much is known about development ripening, little information available how regulated the postclimacteric phase. A targeted systems biology approach revealed a novel regulatory mechanism tomato (Solanum lycopersicum) when have reached their maximal production level which characterized by decline in biosynthesis. Ethylene shut down at...
Aquatic and semi-aquatic plants are well adapted to survive partial or complete submergence which is commonly accompanied by oxygen deprivation. The gaseous hormone ethylene controls a number of adaptive responses including adventitious root growth aerenchyma formation. Reactive species (ROS) act as signaling intermediates in ethylene-controlled adaptation possibly also independent ethylene. ROS levels controlled synthesis, enzymatic metabolism, non-enzymatic scavenging. While the actors...
When plants encounter soil water logging or flooding, roots are the first organs to be confronted with reduced gas diffusion resulting in limited oxygen supply. Since do not generate photosynthetic oxygen, they rapidly faced shortage rendering particularly prone damage. While metabolic adaptations low conditions, which ensure basic energy supply, have been well characterized, adaptation of root growth and development received less attention. In this study, we show that hypoxic conditions...
Increasing drought stress poses a severe threat to agricultural productivity. Plants, however, have evolved numerous mechanisms cope with such environmental stress. Here we report that the stress-induced production of peptide signal contributes tolerance. The expression phytosulfokine (PSK) precursor genes, and transcripts three subtilisin-like serine proteases, SBT1.4, SBT3.7, SBT3.8, were found be up-regulated in response osmotic Stress symptoms more pronounced sbt3.8 loss-of-function...
Aerobic reactions are essential to sustain plant growth and development. Impaired oxygen availability due excessive water availability, e.g., during waterlogging or flooding, reduces productivity survival. Consequently, plants monitor adjust metabolism accordingly. Despite the identification of central components in hypoxia adaptation recent years, molecular pathways involved very early activation low-oxygen responses insufficiently understood. Here, we characterized three endoplasmic...
Summary Partial submergence or treatment with either ethylene gibberellin (GA) promotes rapid internodal growth in deepwater rice ( Oryza sativa L.). Earlier work has shown that GA is the immediate hormonal signal for this response, which involves induction of cell cycle at G2/M phase transition and subsequent enhancement rate DNA synthesis. In all eukaryotes, onset mitosis regulated by p34 cdc2/CDC28 protein kinase, whose activity assayed vitro phosphorylation histone H1. It was found...
Programmed cell death (PCD) of epidermal cells that cover adventitious root primordia in deepwater rice (Oryza sativa) is induced by submergence. Early suicide may prevent injury to the growing emerges under flooding conditions. Induction PCD dependent on ethylene signaling and further promoted gibberellin (GA). Ethylene GA act a synergistic manner, indicating converging pathways. Treatment plants with alone did not promote PCD. biosynthesis inhibitor paclobutrazol resulted increased...
Summary The methionine (Met) cycle contributes to sulfur metabolism through the conversion of methylthioadenosine (MTA) Met at expense ATP. MTA is released as a by‐product ethylene synthesis from S ‐adenosylmethionine (AdoMet). Disruption in Arabidopsis mtk mutant resulted an imbalance AdoMet homeostasis sulfur‐limiting conditions, irrespective source supplied plants. At low concentration 100 μ m sulfate, had reduced levels and growth was retarded compared with wild type. An elevated...