Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Factors influencing the production of stilbenes by the knotweed, Reynoutria × bohemica | Kováĩová et al. BMC Plant Biology 2010 10 19 http 1471-2229 10 19 BMC Plant Biology RESEARCH ARTICLE Open Access Factors influencing the production of stilbenes by the knotweed Reynoutria X bohemica Marcela Kovárová1 Kristýna Bartủnková1 Tomas Frantik1 Helena Koblihová1 Katerina Prchalová2 Miroslav Vosátka1 Abstract Background Japanese knotweed Reynoutria japonica is known for its high growth rate even on adverse substrates and for containing organic substances that are beneficial to human health. Its hybrid Reynoutria X bohemica was described in the Czech Republic in 1983 and has been widespread ever since. We examined whether Reynoutria X bohemica as a medicinal plant providing stilbenes and emodin can be cultivated in spoil bank substrates and hence in the coalmine spoil banks changed into arable fields. We designed a pot experiment and a field experiment to assess the effects of various factors on the growth efficiency of Reynoutria X bohemica on clayish substrates and on the production of stilbenes and emodin in this plant. Results In the pot experiment plants were grown on different substrates that varied in organic matter and nutrient content namely the content of nitrogen and phosphorus. Nitrogen was also introduced into the substrates by melilot a leguminous plant with nitrogen-fixing rhizobia. Melilot served as a donor of mycorrhizal fungi to knotweed which did not form any mycorrhiza when grown alone. As expected the production of knotweed biomass was highest on high-nutrient substrates namely compost. However the concentration of the organic constituents studied was higher in plants grown on clayish low-nutrient substrates in the presence of melilot. The content of resveratrol including that of its derivatives resveratrolosid piceatannol piceid and astringin was significantly higher in the presence of melilot on clay loess and clayCS. Nitrogen supplied to knotweed by melilot was correlated with the ratio of resveratrol to .
