Aim. The effect of chronic ultraviolet B (UV-B) radiation and cytokinin benzylaminopurine (6-BAP) on the growth, content photosynthetic pigments hydrogen peroxide (HP) in leaves pea plants (Pisum sativum L.) was studied. Methods. Pea cultivar Gotivsky were irradiated by UV-B at a dose 3.5 kJ/m2 per day during 5 days. Groups non-irradiated treated with 6-BAP after end radiation. Length shoots ro...

We have examined 35 epidermal tumors induced in mice of four different strains by chronic exposure to ultraviolet B radiation for the presence of aberrations in the p53 tumor suppressor gene. Polymerase chain reaction products from p53 exons 5 to 8 were screened by single-strand conformation polymorphism analysis and sequencing. Base substitutions were found in seven tumors (20%). All mutations...

Various biotic and abiotic factors are known to exert selection pressures on floral traits, but the influence of ultraviolet-B (UV-B) light on the evolution of flower structure remains relatively unexplored. We have examined the effectiveness of flower structure in blocking radiation and the effects of UV-B on pollen viability in 42 species of alpine plants in the Hengduan Mountains, China. Flo...