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The main objective of dissertation thesis was to show impact of exogenous application of growth regulators on physiology and the total yield of winter wheat under drought stress. For the purpose of assessing the impact of growth regulators under drought conditions, it was in 2013-2014 and 2014-2015 established field experiment at the field experimental station Žabčice. The field experiment monitored the effects of growth regulators on water use effeciency and tolerance to drought stress. We compared the effect of four growth regulators representing a different mode of action, the application time and potential of drought stress reduction. These were the active compound chlormequate (CCC) applied at the beginning of stem elongation, trinexapac-ethyl applied in the middle of stem elongation, etephon applied at the end of stem elongation and finally it was application of fungicide from the group of strobilurins (azoxystrobin) carried out at the heading growth stage. The drought stress was inducted by using experimental rain-out shelters that were installed at the end of stem elongation. Approximatelly 2 and 4 weeks after the beginning of drought stress, physiological measurements. Lower grain yields were recorded in 2014 with the average yields (4 to 6 t.ha-1). The highest grain yields were in 2015 with the average yields (10 to 13 t.ha-1).The positive impact of plant growth regulators was demonstrated mostly in increased yield and spike productivity. A positive effect of plant growth regulators on elimination of negative impact of drought in the parameter Amax was demonstrated after application of azoxystrobin, to a lesser extent after application of CCC and trinexapax. Etephon had the lowest impact on elimination of drought stress. The negative impact of drought stress on chlorophyll content was statistically significantly eliminated in all treatments by growth regulators. In addition, application of growth regulators reduced the impact of drought stress on water use efficiency (WUE). Growth regulators also mitigate a negative impact of drought stress on the primary phase of photosynthesis evaluated using chlorophyll fluorescence parameters. In the growth chamber experiment, the effect of growth regulators on the combined effect of drought stress and vapour pressure deficit (VPD) was studied. The highest positive effect in dry conditions had application of trinexapac-ethyl and CCC regulators under both low and high VPD.

Thesis topic: Assessment of wheat yield and quality. Three conventional varieties (Midas, Genius and Papageno) and one hybrid variety (Hyland) were subject to the test. The test was carried out in operational conditions of an agricultural plant in 2014. The assessed Midas and Genius varieties are classified as elite varieties in terms of baking quality and the Papageno variety and the hybrid Hyland variety are classified as unsuitable for dough production. The test was aimed at the assessment of the main yield elements, i.e. the number of spikes per m2, the number of grains per spike and the weight of a thousand grains. Another assessment parameter was the quality of grains of the assessed varieties.