Showing papers by "Alexander Lux published in 2017"

Expression of Genes for Si Uptake, Accumulation, and Correlation of Si with Other Elements in Ionome of Maize Kernel.

Abstract: The mineral composition of cells, tissues and organs is decisive for the functioning of the organisms, and is at the same time an indicator for understanding of physiological processes. We measured the composition of the ionome in the different tissues of maize kernels by element microanalysis, with special emphasis on silicon (Si). We therefore also measured the expression levels of the Si transporter genes ZmLsi1, ZmLsi2 and ZmLsi6, responsible for Si uptake and accumulation. Two weeks after pollination ZmLsi1 and ZmLsi6 genes were expressed, and expression continued until the final developmental stage of the kernels, while ZmLsi2 was not expressed. These results suggest that exclusively ZmLsi1 and ZmLsi6 are responsible for Si transport in various stages of kernel development. Expression level of ZmLsi genes was consistent with Si accumulation within kernel tissues. Silicon was mainly accumulated in pericarp and embryo proper and the lowest Si content was detected in soft endosperm and the scutellum. Correlation linkages between the distribution of Si and some other elements (macroelements Mg, P, S, N, P, and Ca and microelements Cl, Zn and Fe) were found. The relation of Si with Mg was detected in all kernel tissues. The Si linkage with other elements was rather specific and found only in certain kernel tissues of maize. These relations may have effect on nutrient uptake and accumulation.

Expression of Genes for Si Uptake, Accumulation, and Correlation of Si with Other Elements in Ionome of Maize Kernel

Abstract: The mineral composition of cells, tissues and organs is decisive for the functioning of the organisms, and is at the same time an indicator for understanding of physiological processes. We measured the composition of the ionome in the different tissues of maize kernels by element microanalysis, with special emphasis on silicon (Si). We therefore also measured the expression levels of the Si transporter genes ZmLsi1, ZmLsi2 and ZmLsi6, responsible for Si uptake and accumulation. Two weeks after pollination ZmLsi1 and ZmLsi6 genes were expressed, and expression continued until the final developmental stage of the kernels, while ZmLsi2 was not expressed. These results suggest that exclusively ZmLsi1 and ZmLsi6 are responsible for Si transport in various stages of kernel development. Expression level of ZmLsi genes was consistent with Si accumulation within kernel tissues. Silicon was mainly accumulated in pericarp and embryo proper and the lowest Si content was detected in soft endosperm and the scutellum. Correlation linkages between the distribution of Si and some other elements (macroelements Mg, P, S, N, P, and Ca and microelements Cl, Zn and Fe) were found. The relation of Si with Mg was detected in all kernel tissues. The Si linkage with other elements was rather specific and found only in certain kernel tissues of maize. These relations may have effect on nutrient uptake and accumulation.

Future geography graduates - how much their degree matters? Student expectations at Comenius University, Bratislava, Slovakia

Abstract: Higher education has been perceived as a value, necessary for the process of societal development, as well as the development of individuals in post-socialist Europe. In this context, the paper aims to focus on Geography students and graduates to analyse their expectations for their futures in the discipline. Geography students are discussed here at Comenius University, Bratislava, Slovakia, but implications can be applied broadly. In particular, gender-based differences were revealed in Geography students' ambitions related to their future careers. Not surprisingly, attitudes of students and Geography teaching staff differ substantially in some aspects, including labour-market orientation of Geography curriculum. Lack of practical and business-related skills in existing curriculum might be a limitation of the graduates' labour prospects.

Obrazový průvodce anatomií rostlin - Visual Guide to PlantAnatomy

Abstract: Dvojjazycna, cesko-anglicka monografie o vnitřni stavbě převažně cevnatých rostlin. Obsahuje DVD s rozsiřenou verzi tohoto dila.