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Role of polygalacturonic acid and the cooperative effect of caffeic and malic acids on the toxicity of Cu(II) towards triticale plants (× Triticosecale Wittm)

Garau, Giovanni and Mele, Elena and Castaldi, Paola and Lauro, Giampaolo and Deiana, Salvatore Andrea (2015) Role of polygalacturonic acid and the cooperative effect of caffeic and malic acids on the toxicity of Cu(II) towards triticale plants (× Triticosecale Wittm). Biology and Fertility of Soils (in press). ISSN 0178-2762. Article.

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DOI: 10.1007/s00374-015-0999-y

Abstract

In this study, we investigated the cooperative effect of caffeic (CAF) and malic (MAL) acids as well as the role of polygalacturonic acid (PGA) on the toxicity of copper (Cu)(II) towards triticale plants (× Triticosecale Wittm.). Plant growth experiments carried out in hydroponic solutions at pH 6.0 revealed that CAF and PGA, but not MAL, were quite effective at reducing Cu(II) phytotoxicity and that MAL addition abolished the positive effects of CAF. The study of the CAF-Cu(II) system in aqueous solution clearly indicated that the lower toxicity of Cu(II) in the presence of CAF was due to the occurrence of a redox reaction between CAF and Cu(II), while the phytotoxicity recorded in the Cu(II)-CAF-MAL system was attributed to a competitive effect of MAL in the Cu(II) complexation by CAF, which ultimately reduced the redox activity. The lowest Cu(II) phytotoxicity recorded in the presence of PGA was attributed to the high affinity of the polysaccharidic matrix towards the metal ion. The results from this study shed new light on the Cu(II)-detoxifying action of selected root exudates and highlight the negative cooperation of MAL on the Cu(II)-detoxifying activity by CAF.

Item Type:Article
ID Code:10941
Status:In Press
Refereed:Yes
Uncontrolled Keywords:Root exudates, caffeic acid, malic acid, polygalacturonic acid, Cu(II) phytotoxicity, caffeic acid–Cu(II) redox reaction
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/13 Chimica agraria
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Springer Berlin / Heidelberg
ISSN:0178-2762
Deposited On:26 May 2015 10:26

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