tailieunhanh - báo cáo khoa học: " Effect of clone selection, nitrogen supply, leaf damage and mycorrhizal fungi on stilbene and emodin production in knotweed"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Effect of clone selection, nitrogen supply, leaf damage and mycorrhizal fungi on stilbene and emodin production in knotweed | Kovárová et al. BMC Plant Biology 2011 11 98 http 1471-2229 11 98 BMC Plant Biology RESEARCH ARTICLE Open Access Effect of clone selection nitrogen supply leaf damage and mycorrhizal fungi on stilbene and emodin production in knotweed 1 1 1 1 2 Marcela Kovárová Tomas Frantik Helena Koblihová Kristýna Bartunkova Zora Nývltová and Miroslav Vosátka1 Abstract Background Fallopia japonica and its hybrid F. xbohemica due to their fast spread are famous as nature threats rather than blessings. Their fast growth rate height coverage efficient nutrient translocation between tillers and organs and high phenolic production may be perceived either as dangerous or beneficial features that bring about the elimination of native species or a life-supporting source. To the best of our knowledge there have not been any studies aimed at increasing the targeted production of medically desired compounds by these remarkable plants. We designed a two-year pot experiment to determine the extent to which stilbene resveratrol piceatannol resveratrolosid piceid and astringins and emodin contents of F. japonica F. sachalinensis and two selected F. xbohemica clones are affected by soil nitrogen N supply leaf damage and mycorrhizal inoculation. Results 1 Knotweeds are able to grow on substrates with extremely low nitrogen content and have a high efficiency of N translocation. The fast-spreading hybrid clones store less N in their rhizomes than the parental species. 2 The highest concentrations of stilbenes were found in the belowground biomass of F. japonica. However because of the high belowground biomass of one clone of F. xbohemica this hybrid produced more stilbenes per plant than F. japonica. 3 Leaf damage increased the resveratrol and emodin contents in the belowground biomass of the non-inoculated knotweed plants. 4 Although knotweed is supposed to be a non-mycorrhizal species its roots are able to host the fungi. Inoculation with mycorrhizal fungi resulted in up to

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