Nuclear ribosomal sequences and Cd, Zn, Pb and Fe accumulation of different populations of hyperaccumulating species Thlaspi praecox Wulfen (Noccaea) were studied to reveal their relationships to other representatives of the genus and especially to the well known hyperaccumulator T. caerulescens; comparisons of their accumulating properties were also made.
Teosinte is the wild progenitor of modern maize. The study showed that many cellular features 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.
High amounts of Cd were measured in seeds without drastically affecting seed viability. In intact seeds and isolated embryos, almost two thirds of the Cd ligands were thiol groups (CdSC) while in roots and shoots up to 80% of the Cd ligands were oxygen ligands that are provided by the cell walls and by organic acids stored in vacuoles.
St. John’s wort, grown under different levels of UVB radiation, was analysed for its concentrations of flavonoids, tannins and hypericin. A high level of UVB radiation increased leaf concentrations of flavonoids and of tannins. The concentration of hypericin in leaves exposed to enhanced UVB radiation was lower than that of leaves exposed to reduced UVB radiation.
Communities of endophytic fungi on the roots of goat willows (Salix caprea) growing in soil with different degrees of heavy metal pollution, were analysed using molecular tools. Additionally, leaf accumulated metals and photosynthetic pigments were analysed for evaluation of the fitness of goat willows growing at the polluted site.