Interactions between nitrogen nutrition and phytohormone levels in Festulolium plants
Pavlikova, D., Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Neuberg, M., Ceska Zemedelska Univ., Prague (Czech Republic). Fakulta Agrobiologie, Potravinovych a Prirodnich Zdroju | Zizkova, E., Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky | Motyka, V., Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky | Pavlik, M., Akademie Ved, Prague (Czech Republic). Ustav Experimentalni Botaniky
This study aims to reveal and to compare the effect of two various systems of nitrogen nutrition, namely injection and sidedress application, on the levels of NO3- and phytohormones (cytokinins, abscisic acid (ABA), indole-3-acetic acid (IAA)) in Festulolium plants. Calcium nitrate (CN) or ammonium sulphate (AS) were used as N source in the pot experiment. The yield of Festulolium above and below ground biomass was more substantially enhanced after sidedress application of both AS or CN in comparison with injection application. The levels of endogenous cytokinins peaked 5 days after application regardless of the form of N source and the method of application. The increased concentration of endogenous cytokinins as well as the enhanced content of selected free amino acids suggest that N applied sidedress can maintain better distribution patterns of nutrients and provide improved conditions for growth and N uptake. The N application affected ABA concentrations on all tested treatments. The correlation between NO3- and ABA concentrations ranged from 0.77 to 0.89. A significant IAA increase was recorded in plants after ammonium nitrogen sidedress application. It was confirmed that applications of nitrate reduced IAA concentration (correlation between NO3- and IAA for AS treatment R2 = 0.77-0.94).
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