The IPB has once again been recognized for its exemplary actions in terms of equal opportunity-oriented personnel and organizational policies and has received the TOTAL E-QUALITY certification for the…
The Plant Science Student Conference (PSSC) has been organised by students from the two Leibniz institutes, IPK and IPB, every year for the last 20 years. In this interview, Christina Wäsch (IPK) and…
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.
Publications
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.