|
|
Alternative Plant Utilization for Obtaining of Significant Nature Substances: Can Weed Find a Utilization?
Wimmer, Zdeněk ; Sajfrtová, Marie ; Sovová, Helena ; Pavlík, Milan ; Svobodová, Hana ; Jurček, Ondřej ; Wimmerová, Martina
Numbers of compounds and their mixtures, which are produced by plants, can be obtained by extracting plant materials by supercritical fluids. Phytosterols and phytoecdysterotds represent an important family of these plant products. They can be used in a synthesis of supramolecular structures with possible importance for targeted effect of drugs or other biological(y active compounds. Target organisms for the compounds investigated are: (a) insects - pests and human food competitors, also important as model system in investigation of convenient application forms of biologically active compounds; (b) cell cultures used during basic pharmacological research. Supramolecular structures may form convenient matrices for practical application of the biologically active compounds. It has already been proved that numbers of medicinal or cultural plants produce important natural compounds. The present question has appeared to be answered, if so far inutile weeds may be turned into important sources of pro-drugs for disease treatments.
|
|
| |
|
|
The effect of fertilization by nitrogen on leaves of free amino acids in plants
Neuberg, M. ; Pavlík, Milan ; Balík, J. ; Kaliszová, R. ; Pavlíková, D.
The effect of different fertilization systems, especially CULTAN (Controlled Uptake Long Term Ammonium Nutrition), on levels of selected amino acids (alanine, glycine, serine, asparagine and glutamine) was investigated in this study. As modeling plant was used maize (Zea mays L.; hybrid Rivaldo) and levels of amino acid were measured by GC-MS. We found significant difference in the levels of certain amino acids. Concentration of alanine and glutamine was higher by treatment with urea ammonium nitrate solution (DAM 390) compared with individuals treated by ammonium nitrate.
|
|
|
The phosphorus role in plants
Pavlíková, D. ; Pavlík, Milan ; Balík, J.
Phosphorus play very important role in plant metabolism. It is active as energy transporter and important structural component. Phosphate is relatively unavailable to plant roots. Thus plants have evolved several strategies for obtaining P from the soil. They can modify root structure and function, excrete root exudates helping with solubilization of P compounds in root rhizosphere.
|
|
| |
|
| |
|
| |
|
| |
|
|
Inducers and elicitors of systemic acquired resistance of rapeseed to Leptosphaeria maculans
Šašek, Vladimír ; Burketová, Lenka
Systemic acquired resistance (SAR) is one of the sophisticated mechanisms used by plants to defend themselves against pathogen attacks and herbivorous insects. It is based on the activation of defense mechanisms in uninfected parts of the plant. As a result the entire plant is more resistant to a secondary infection. That is very advantageous for the plant because it is too costly to have defense responses switched on all the time. Although this phenomenon was described almost fifty years ago, it received no serious attention until past decade. To use SAR widespread in integrated pest management it is necessary to describe it on molecular level and show its differences in various host-pathogen interactions.
|
|
| |
guest ::
