title: Accumulation of essential oils in relation to root differentiation in Angelica archangelica L.
abstract: The accumulation of essential oils in Angelica archangelica subsp. archangelica roots at different developmental stages was investigated through histochemical and chemical analyses. Roots less than 1 mm in diameter showed a primary diarch structure and two primary secretory ducts in the pericycle. These ducts were ephemeral and probably became dysfunctional early on. Oil accumulation was observed only in the secondary secretory ducts formed by cambium activity and located in the secondary phloem. Gas chromatographic analyses revealed that only taproots exceeding 5 mm in diameter contained a high concentration of alpha- and beta-phellandrene, which appreciably influence the oil's aroma.
authors.affiliation: Dipartimento di Biologia Vegetale, Università degli Studi di Roma La Sapienza, Rome, Italy. gabriella.pasqua@uniroma1.it
authors.forename: G
authors.initials: G
authors.lastname: Pasqua
authors.forename: B
authors.initials: B
authors.lastname: Monacelli
authors.forename: A
authors.initials: A
authors.lastname: Silvestrini
mesh_terms: D029970:Angelica archangelica; D002454:Cell Differentiation; D002849:Chromatography, Gas; D009822:Oils, Volatile / Q000032:analysis / Q000378:metabolism*; D010938:Plant Oils / Q000032:analysis / Q000378:metabolism*; D018517:Plant Roots / Q000737:chemistry / Q000378:metabolism*; D010946:Plants, Medicinal / Q000737:chemistry
chemical_list: D009822:Oils, Volatile; D010938:Plant Oils