Plant phenolics can have applications in pharmaceutical and other industries. To identify and quantify the phenolic compounds in Helianthus tuberosus leaves, qualitative analysis was performed by a reversed phase high-performance liquid chromatography coupled with tandem mass spectrometry (HPLC-MS/MS) and quantitative analysis by HPLC. Ten chlorogenic acids (CGAs) were identified (3-o-caffeoylq...

After a wound-desiccation stress, plant tissues can secrete products that have specific cytotoxicity against melanoma B16 cells. Healthy plant or animal cells were not susceptible to these products. Secretion of the active product varied with the plant species and the plant organs. The secretion of tubers of yam (Dioscorea cayenensis Lam), cassava (Manihot esculenta), Jerusalem artichoke (Helia...

Beni Tal* and David J. Robeson A RCO Plant Cell Research Institute, 6560 Trinity Court, Dublin, CA 94568—2685, USA Z. Naturforsch. 41c, 1032—1036 (1986); received July 16/August 12. 1986 Pyrenocine A, Phytotoxin, Fungal M etabolite, Alternaria, Helianthus tuberosus A previously undescribed species of Alternaria was isolated from the leaves of Helianthus tuberosus bearing necrotic lesions. W hen...

The silage specimens on which data are reported were from grass and grass-clover mixtures ensiled during the summer of 1950 on various farms in the northeast of Scotland, and were taken at random from specimens being analysed here. It is seen from Fig. 2 that the lactic acid content of silage falls rapidly with rise ofpH. This is in accordance with the generally held view that in silage of pH g...

Vacuoles isolated by a mechanical slicing method from developing tubers of Jerusalem artichoke (Helianthus tuberosus L.) contain activities of the two principal enzymes responsible for fructan synthesis: sucrose-sucrose fructosyl transferase and fructan-fructan fructosyl transferase. Both enzymes are associated with the vacuolar sap and not with the tonoplast. In vacuoles isolated from dormant ...