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Response of primary photosynthetic processes in C3 and C4 monocotyledonous plants to steroids aplication
Frimlová, Klára ; Rothová, Olga (advisor) ; Mocová, Klára Anna (referee)
Brassinosteroids and ecdysteroid are naturally occuring chemical compounds in plants. The aim of this study was to show whether the application of exogenous steroids such as brassinosteroids (24-epibrassinolide, 28-homobrassinolide, 24-epicastasterone) and ecdysteroid (20-hydroxyecdysone) can affect the morphological parameters and primary photosyntetic processes of selected monocotyledons that was barley, wheat, maize and sorghum. Non-destructive method for measuring of fast kinetics of chlorophyll fluorescence in investigated plants was used. Analysis of primary photosynthetic processes was realized in five time periods from the application of exogenous steroids on the two different old leaves. The response to the treatment by exogenous steroid was different species by plant species. One week after the application of exogenous steroids plants showed differences in their morphological parameters but most of them were not signifficant. The most steroid-sensitive plant was wheat morphological parameters of were significantly different from untreated control plants. No change in maximum quantum yield of photosystem II to the application of exogenous steroid in plants of Sorghum bicolor L. was detected. In the other examined plant species changes in photosynthesis parameters were detected which...
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Response of primary photosynthetic processes in C3 and C4 monocotyledonous plants to steroids aplication
Frimlová, Klára ; Rothová, Olga (advisor) ; Mocová, Klára Anna (referee)
Brassinosteroids and ecdysteroid are naturally occuring chemical compounds in plants. The aim of this study was to show whether the application of exogenous steroids such as brassinosteroids (24-epibrassinolide, 28-homobrassinolide, 24-epicastasterone) and ecdysteroid (20-hydroxyecdysone) can affect the morphological parameters and primary photosyntetic processes of selected monocotyledons that was barley, wheat, maize and sorghum. Non-destructive method for measuring of fast kinetics of chlorophyll fluorescence in investigated plants was used. Analysis of primary photosynthetic processes was realized in five time periods from the application of exogenous steroids on the two different old leaves. The response to the treatment by exogenous steroid was different species by plant species. One week after the application of exogenous steroids plants showed differences in their morphological parameters but most of them were not signifficant. The most steroid-sensitive plant was wheat morphological parameters of were significantly different from untreated control plants. No change in maximum quantum yield of photosystem II to the application of exogenous steroid in plants of Sorghum bicolor L. was detected. In the other examined plant species changes in photosynthesis parameters were detected which...
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Effect of brassinosteroid and Atonik on growth of onion in different moisture conditions
Pařízková, Lada ; Doležalová, Jitka (advisor) ; Augustinová, Ludmila (referee)
Summary The aim of this study was to investigate the effect of synthetic brassinolide and Atonik, as a growth promoter supporting growth and development of plant that have been grown in different moisture conditions. For experiment were used two species of onion ('Alice'and'Lusy') which had been treated during the growth with synthetic brassinolide solution in concentrations 1.10-9 mol.l-1 and 1.10-11 mol.l-1 and 0.1% concentration of Atonik solution. For controlling was sown untreated variant. Average plant height and later diameter of the neck were observed and recorded during the experiment. Results showed that the product Atonik had in both variants positive influence on plant growth in deficit moisture conditions. Its effects have been later inconclusive or inhibitory. Brassinosteroid had positive effect on growth under optimal moisture conditions in "Lusy's" case and in stressful conditions in "Alice's" case. Brassinostreroid, unlike Atonik product, prevailed in neck diameter efficiency. In both cases, brassinosteroid had more positive effect on average yield in optimal moisture conditions. In deficit moisture conditions had Atonik product more positive effect on the yield of onion in both cases. To verify the results, it is necessary to repeat the experiment several time.
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