Location of Repository

Role of the phloem in the biochemistry and ecophysiology of benzylisoquinoline alkaloid metabolism

By Eun-Jeong eLee, Jillian eHagel and Peter eFacchini

Abstract

Benzylisoquinoline alkaloids (BIAs) are a diverse group of biologically active specialized metabolites produced mainly in four plant families. BIA metabolism is likely of monophyletic origin and involves multiple enzymes yielding structurally diverse compounds. Several BIAs possess defensive properties against pathogenic microorganisms and herbivores. Opium poppy (Papaver somniferum: Papaveraceae) has emerged as a model system to investigate the cellular localization of BIA biosynthesis. Although alkaloids accumulate in the laticifer cytoplasm (latex) of opium poppy, corresponding biosynthetic enzymes and gene transcripts are localized to proximal sieve elements and companion cells, respectively. In contrast, BIA metabolism in the non-laticiferous meadow rue (Thalictrum flavum; Ranunculaceae) occurs independent of the phloem. Evidence points toward the adoption of diverse strategies for the biosynthesis and accumulation of alkaloids as defensive compounds. Recruitment of cell types involved in BIA metabolism, both within and external to the phloem, was likely driven by selection pressures unique to different taxa. The biochemistry, cell biology, ecophysiology, and evolution of BIA metabolism are considered in this context

Topics: Phloem, plant defense, laticifer, benzylisoquinoline alkaloid, sieve element, Plant culture, SB1-1110
Publisher: Frontiers Media S.A.
Year: 2013
DOI identifier: 10.3389/fpls.2013.00182
OAI identifier: oai:doaj.org/article:fe6dd4b6de8a4002829fae98d8a050c6
Journal:
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • https://doaj.org/toc/1664-462X (external link)
  • http://journal.frontiersin.org... (external link)
  • https://doaj.org/article/fe6dd... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.