title: Inhibition of seed germination by quinolizidine alkaloids : Aspects of allelopathy in Lupinus albus L.
abstract: Germination of Lactuca sativa L. was inhibited by mixtures of quinolizidine alkaloids. The alkaloid esters resulted in the strongest inhibition: 6 mM 13-tigloyloxylupanine inhibited germination by 100%, whereas the other lupin alkaloids, such as lupanine and sparteine, gave a 45 and 20% inhibition, respectively. Seedlings of Lupinus albus L., which are not affected by quinolizidine alkaloids, excrete lupanine and 13-tigloyloxylupanine into the surrounding medium by their roots. It is assumed that lupin alkaloids are potential compounds of plant-plant interaction (i.e. allelopathy) besides their role in plant-herbivore interrelations.
authors.affiliation: Institut für Pharmazeutische Biologie der Technischen Universität, Mendelssohnstrasse 1, D-3300, Braunschweig, Federal Republic of Germany.
authors.forename: M
authors.initials: M
authors.lastname: Wink