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Osmotické přizpůsobení rekombinantních linií ječmene jarního s vyšší tolerancí k suchu a jeho hodnocení v polních podmínkách
 Baláž, David
The thesis deals with the role of drought and the effects on growth, morphology and yield of barely. The evaluation of the physiological mechanisms at the level of the osmotic adjustment of plants was done at two locations differing in the soil water regime. These mechanisms were studied on a group of 20 recombinant inbred lines (RIL) derived from crosses between spring barley Jersey (spring malting cultivar) and Syrian landrace Tadmor, which was used as a donor of drought tolerance. The progeny derived from reciprocal crosses were evaluated for yield parameters (thousand grain weight, grain yield per plant, the proportion of grains over 2 mm) and qualitative parameters (starch content and nitrogen content). The physiological status of the plants was evaluated using relative water content, osmotic potential (OP) and proline content as an osmotically active substance. The effect of location on all above mentioned parameters was estimated on parental varieties as well as on RIL lines. According to the results several lines were selected which exhibit relatively high stability of yield and qualitative parameters at both locations. The relationship between the yield parameters and values associated with the mechanism of osmotic adjustment (RWC, OP and proline content) was not clearly demonstrated. Decrease of OP and increase of proline content in plants cultivated under dry conditions at location Žabčice mostly corresponded to increased level of plant wilting, therefore it is possible that only passive mechanism for OP was involved. This mechanism did not affect the drought tolerance.
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Hodnocení výnosových a kvalitativních znaků u rekombinantních linií ječmene jarního s vyšší tolerancí k suchu
 Baláž, David
Goal of "Evaluation of yield and quality parameters at recombinant lines of spring barley with higher tolerance to drought" was to analyze offspring from crossing of two selected parents of Jersey a spring malting barley and Tadmor a syrian landrace variety of barley. The sowing of F4 generation of hybrids has been done on two sites in Brno and Žabčice. Single traits were evaluated in offspring of Jersey x Tadmor and Tadmor x Jersey. We evaluated growth, earliness, number of plants and plant height in vegetation.After harvest we specified grain color, starch content and nitrogen content on FT-NIR Nicolet Magna unit. Furthermore we measured weight of thousand seeds and total weight of harvested grains. Results showed a few genotypes, that proven better characteristics than parents. In Brno strain 1/28 excelled with high starch content similar to variety Jersey while conserving low rates of grain protein content.
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3 Baláž, Dominik
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