Increased synthesis of a new oleanane-type saponin in hairy roots of marigold (Calendula officinalis) after treatment with jasmonic acid.
Fiche publication
Date publication
avril 2018
Journal
Natural product research
Auteurs
Membres identifiés du Cancéropôle Est :
Dr VERNEX-LOSET Lionel, Pr BONNET Sabine
Tous les auteurs :
Markowski M, Długosz M, Szakiel A, Durli M, Poinsignon S, Bouguet-Bonnet S, Vernex-Loset L, Krier G, Henry M
Lien Pubmed
Résumé
Native plant of marigold (Calendula officinalis L.) synthesizes oleanolic acid saponins classified as glucosides or glucuronides according to the first residue in sugar chain bound to C-3 hydroxyl group. Hairy root culture, obtained by transformation with Agrobacterium rhizogenes strain 15834, exhibit a potent ability of synthesis of oleanolic acid glycosides. The HPLC profile of saponin fraction obtained from C. officinalis hairy roots treated with plant stress hormone, jasmonic acid, showed the 10-times increase of the content of one particular compound, determined by NMR and MALDI TOF as a new bisdesmoside saponin, 3-O-β-d-glucuronopyranosyl-28-O-β-d-galactopyranosyl-oleanolic acid. Such a diglycoside does not occur in native C. officinalis plant. It is a glucuronide, whereas in the native plant glucuronides are mainly accumulated in flowers, while glucosides are the most abundant saponins in roots. Thus, our results revealed that the pathways of saponin biosynthesis, particularly reactions of glycosylation, are altered in C. officinalis hairy root culture.
Mots clés
Calendula officinalis, NMR, Triterpenoid saponin, hairy roots, jasmonic acid
Référence
Nat. Prod. Res.. 2018 Apr 18;:1-5