We used four potentially unlinked nuclear DNA regions to evaluate the origin of and relationships within Heliosperma. The origin reflect both reticulate evolution and sorting events. At least two lineages have been involved in the origin of Heliosperma. The model presented in the paper enables discrimination between different processes causing the incongruences among different gene trees.
The study showed that many cellular features of teosinte that were previously attributed to domestication are already developed in teosinte. The only and most important difference between maize and teosinte is the distribution of endoreduplication, where cell number remains constant but nuclear DNA is replicated. Additional knowledge of this process could substantially improve our most important crop.
The study of trace elements in aquatic species Najas marina, Potamogeton lucens, Nuphar lutea and Potamogeton nodosus showed the highest degree of translocation of As, Ni, Pb and Cr from sediment into plant roots, while Cu and Zn were equally distributed throughout the plant.
The uptake of Se St. John's wort grown under different levels of UV-B radiation was studied. The amount of Se in untreated plants was about 100 times lower than in that foliarly sprayed with Se, the highest concentration being detected in plants grown under reduced levels of UV-B radiation. The results revealed that foliar application of Se fertiliser is feasible and effective in St. John's wort.
Community profiles of endophytic fungi on the roots of goat willows (Salix caprea) growing in soil with different degrees of heavy metal pollution, were analysed. Additionally, the most abundant fungal endophytes, important for the survival of the willows in such extreme ecosystems, were identified using molecular techniques.