Laboratory of Hormonal Regulations in Plants
We are a medium-sized laboratory consisting of nine scientists and a varying number of under- and post-graduate students. Our research is focused on the metabolic regulation of intracellular and extracellular cytokinin and auxin levels and the mechanisms regulating the uptake and secretion of these phytohormones.
Our studies embrace intact plants, plant cell suspensions and tissue cultures expressing specific genes involved in the metabolism, transport and signaling by cytokinins and auxins, including genes encoding isopentenyltransferase, cytokinin oxidase/dehydrogenase, zeatin-O-glucosyltransferase, auxin binding protein 1 and auxin influx and efflux carriers.
Attention is also paid to development of new methods for analysis of phytohormones (auxins, cytokinins, abscisic acid, and ethylene precursor), as well as the potential exploitation of research results for improvement of productivity of selected crop plants.
With pleasure, we organize the international symposium Auxins and Cytokinins in Plant Development. Last ACPD was held in 2014 and the next one will take place in 2018.
Group of auxin transport (Head: Jan Petrášek)
Plant hormone auxin is a key regulator of many developmental processes in plants. It plays a major role in control of temporal and spatial aspects of plant growth and, as such, it co-ordinates plant development. In contrast to other plant growth regulators (plant hormones), in some tissues auxin molecules are transported to long distances through plant body and their transport is directional (polar).
Mechanism of the polar auxin transport is based on physical-chemical properties of auxin molecules and on their molecular forms inside and outside cells. It is a very complex and dynamic process with many levels of regulation. More…
Group of metabolism and physiological function of cytokinins (Head: Václav Motyka)
Cytokinins are naturally occurring phytohormones that act in concert with auxins to regulate cell division and differentiation and thus efficiently control plant growth and development. Transient enhancement of auxin in relation to cytokinin levels induces root formation while the opposite shift results in shoot formation. Re-establishment of the two hormone quantitative ratios (hormonal homeostasis) is essential for further development of induced events.
Endogenous levels of bioactive cytokinins and their mode of action in plants are regulated at different levels and by various mechanisms concerning biosynthesis, metabolic conversions, inactivation and degradation as well as signalling pathways and transport. More…
Group of the role of phytohormones in the interaction with environment (Head: Radka Vaňková)
Plants have evolved complex systems of defence against, and adaption to, the variable and often potentially damaging environmental conditions to which they are exposed during their growth and development. Due to their sessile character, plants need to respond very dynamically to various abiotic (drought, extreme temperatures, high light intensity) as well as biotic stresses (pest and pathogen attacks).
Drought belongs to the most frequent abiotic stresses. Plants cope with water stress by preferential protection of upper leaves and apex. Gradual degradation of macromolecules takes place in lower leaves, nutrients being transported to upper leaves. Plant hormones cytokinins increase the sink strength. More…
Group of mathematical modelling (Head: Klára Hoyerová)
Our laboratory uses mathematical modelling approach to unravel regulatory mechanisms of polar auxin flow in plants.
Nowadays, mathematical modelling is used as a tool for studying auxin transport more and more often. Present models are sometimes excessively simplified and/or do not reflect the structure of the real system properly. We have focused on construction of a detailed model of auxin transport mechanisms in plant cells using experimental data to analyse particular transport mechanism separately (an analytical-synthetic approach). These data include measurements of accumulation kinetics of radiolabeled auxins in cell suspensions and HPLC analysis of radiolabeled auxin metabolism, which has both provided valuable information about auxin transport properties at cellular level. More...
Analytical unit (Head: Petr Dobrev)
The analytical unit of our laboratory works on improving of existing and developing of new analytical procedures for purification, quantitation and metabolic profiling of plant hormones and some other bioactive substances of plant origin. More…
head of the laboratorysenior scientist
- RNDr. Jan Petrášek Ph.D.
- Mgr. Sylva Přerostová
graduated technical assistant
- Ing. Karolína Holečková
- Physiological, biochemical, molecular and phylogenic characterization of metabolic pathways and mechanisms of cytokinin down-regulation in plants , GA ČR , Václav Motyka
- Anatomical and physiological constraints as key factors governing plant vegetative regeneration from roots , GA ČR , Václav Motyka
- Inactivation of cytokinin-type phytohormones via N- and O-glucosylation – phylogeny and significance in evolution of hormonal homeostatic mechanisms , GA ČR , Václav Motyka
- The role of auxin binding protein 1-mediated signaling in the control of vesicle trafficking in plant cells , GA ČR , Milada Čovanová
- Auxin transport and cytoskeleton in the morphogenesis of plant cells , GA ČR , Jan Petrášek
- Integrating proteomic and genomic tools to contribute evolutionary processes across the plant kingdom with emphasis to the family of cytokinins , GA ČR , Václav Motyka
- Propojení proteomických a genomických přístupů při objasňování evolučních procesů napříč rostlinnou říší s důrazem na rodinu cytokininů , GA ČR , Václav Motyka
- The role of cytokinins and polyamines in heat stress response and thermotolerance in tobacco and Arabidopsis plants , GA ČR , Radomíra Vanková
- Alternative ways regulating intra- and extracellular concentrations and activities of isoprenoid cytokinins in plants , GA AV , Václav Motyka
- The role of members of AUX/LAX gene family in auxin influx into plant cell. , GA AV , Klára Hoyerová
Changes in cytokinin content and altered cytokinin homeostasis in AtCKX1 and AtCKX2-overexpressing centaury (Centaurium erythraea Rafn.) plants grown in vitroPLANT CELL, TISSUE AND ORGAN CULTURE 120 767-777 2015 Fulltext: PDF link on intranet only
Cytokinin dynamics in differently senescing laminae of Phragmites australis plants grown in different habitatsSOUTH AFRICAN JOURNAL OF BOTANY 99 54-61 2015 Fulltext: PDF link on intranet only
In vitro shoot organogenesis and comparative analysis of endogenous phytohormones in kohlrabi (Brassica oleracea var. gongylodes): effects of genotype, explant type and applied cytokininsPLANT CELL, TISSUE AND ORGAN CULTURE 121 741-760 2015 Fulltext: PDF link on intranet only
- PLoS ONE 10(5) e0125411 2015 Fulltext: PDF link on intranet only
- BMC PLANT BIOLOGY 15 272 2015
- PLANT SCIENCE 241 96-108 2015
Tobacco susceptibility to Potato virus YNTN infection is affected by grafting and endogenous cytokinin contentPLANT SCIENCE 235 25-36 2015
- PLANT SCIENCE 231 52-61 2015
Cold response of dedifferentiated barley cells at the gene expression, hormone composition and freezing tolerance levels: studies on callus cultures.MOLECULAR BIOTECHNOLOGY 54 337-349 2015
- JOURNAL OF PLANT GROWTH REGULATION 34 723-739 2015 Fulltext: public PDF link