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Detoxification processes from vanadate at the root apoplasm activated by caffeic and polygalacturonic acids

Garau, Giovanni and Palma, Amedeo and Lauro, Giampaolo and Mele, Elena and Senette, Caterina and Manunza, Bruno Mario Luigi and Deiana, Salvatore Andrea (2015) Detoxification processes from vanadate at the root apoplasm activated by caffeic and polygalacturonic acids. PLoS One, Vol. 10 (10), e0141041.. ISSN 1932-6203. Article.

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DOI: 10.1371/journal.pone.0141041


In the root apoplasm, V(V) and V(IV) toxicity can be alleviated through redox and complexation reactions involving phenolic substances and the polyuronic components. In such context we report the role of polygalacturonic acid (PGA) on the reducing activity of caffeic acid (CAF) towards V(V). The redox reaction was particularly effective at pH 2.8 leading to the formation of oxidation products with redox activity towards V(V). An o-quinone was identified as the first product of the reaction which is further involved in the formation of CAF dimers. At pH ≥ 3.6 the redox activity decreased and a yield in V(IV) equal to 38, 31, 21 and 14% was found at pH 3.6, 4.0. 5.0 and 6.0 respectively compared with that obtained at pH 2.8. The redox reaction was faster in the presence of PGA and a higher yield of V(IV) was found in the 4.0–6.0 pH range with respect to the CAF-V(V) binary system. The higher efficiency of the redox reaction in the presence of PGA was related with the ability of PGA to bind V(IV). The biological significance of the redox reaction between CAF and V(V), as well as the role of PGA in such reaction, was established “in vivo” using triticale plants. Results showed that PGA reduced significantly the phytotoxic effects of the V(V)-CAF system.

Item Type:Article
ID Code:11762
Uncontrolled Keywords:Oxidation-reduction reactions, triticale, oxidation, vanadium, ultraviolet-visible spectroscopy, dimers (chemical physics), sorption, vanadates
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:002 Altri enti e centri di ricerca del Nord Sardegna > CNR-Consiglio Nazionale delle Ricerche > Istituto di scienze delle produzioni alimentari, Sassari
001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Public Library of Science
Copyright Holders:© 2015 Garau et al.
Deposited On:14 Jun 2017 13:21

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