The pectic disaccharides lepidimoic acid and beta-d-xylopyranosyl-(1 -> 3)-d-galacturonic acid occur in cress-seed exudate but lack allelochemical activity

摘要

Background and aims Cress-seed (Lepidium sativum) exudate exerts an allelochemical effect, promoting excessive hypocotyl elongation and inhibiting root growth in neighbouring Amaranthus caudatus seedlings. We investigated acidic disaccharides present in cress-seed exudate, testing the proposal that the allelochemical is an oligosaccharin-lepidimoic acid (LMA; 4-deoxy-beta-L-threo-hex-4-enopyranuronosyl-(1 -> 2)-L-rhamnose).