Die Plant Science Student Conference (PSSC) wird seit 20 Jahren im jährlichen Wechsel von Studierenden der beiden Leibniz-Institute IPK und IPB organisiert. Im Interview erläutern Christina Wäsch (IPK) und Carolin Apel (IPB),…
Über 600 Gäste kamen am 4. Juli ans IPB zur Langen Nacht, die Wissen schafft, um bei unserem Wissenschafts-Quiz-Parcours viel Neues zu erfahren und ihre Kenntnisse unter Beweis zu stellen. Unser Programm in diesem Jahr…
Thien, D. G.; Hoang Anh, N. T.; Porzel, A.; Franke, K.; Wessjohann, L.; Van Sung, T.;Triterpene acids and polyphenols from Eriobotrya poilaneiBiochem. Syst. Ecol.40198-200(2012)DOI: 10.1016/j.bse.2011.11.001
The occurrence of flavolignans might be a valuable chemotaxonomic marker for the classification of Rosaceae species.
Publikation
de Gouveia Baratelli, T.; Candido Gomes, A. C.; Wessjohann, L. A.; Machado Kuster, R.; Kato Simas, N.;Phytochemical and allelopathic studies of Terminalia catappa L. (Combretaceae)Biochem. Syst. Ecol.41119-125(2012)DOI: 10.1016/j.bse.2011.12.008
The allelopathic potential of Terminalia catappa L. Combretaceae fruits and leaves on Lactuca sativa L. (lettuce), Euphorbia heterophylla L. and Commelina benghalensis L. was studied. Bioassays indicated the highest activity for dichloromethane and ethyl-acetate fractions of ethanolic extracts from fruits, and the mean effective concentration (EC50) was determined. 2-Pentadecanone; vanillic, siringic, ferulic, p-coumaric, palmitic and stearic acids were characterized in the dichloromethane fraction, and 3,4,4′-tri-O-methyl ellagic acid and β-sitosterol-3-O-β-d-glucoside were isolated from it. No allelopathic effects were observed when the dichloromethane extracts of T. catappa fruit or leaf extracts were applied to the weeds E. heterophylla and C. benghalensis. Bioassays with seasonal sampling revealed an influence on the allelochemical potential of T. catappa. Considering the methodology adopted and the experimental results, the allelopathic activity of T. catappa seems to be related to the interaction of different groups of substances, some of them identified and characterized in this work.