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Cadmium spiked soil modulates root organic acids exudation and ionic contents of two differentially Cd tolerant maize (Zea mays L.) cultivars
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Number of Authors: 7
2017 (English)In: Ecotoxicology and Environmental Safety, ISSN 0147-6513, E-ISSN 1090-2414, Vol. 141, 216-225 p.Article in journal (Refereed) Published
Abstract [en]

Our earlier work described that the roots of two maize cultivars, grown hydroponically, differentially responded to cadmium (Cd) stress by initiating changes in medium pH depending on their Cd tolerance. The current study investigated the root exudation, elemental contents and antioxidant behavior of the same maize cultivars (cv. 3062 (Cd-tolerant) and cv. 31P41 (Cd-sensitive)] under Cd stress. Plants were maintained in a rhizobox-like system carrying soil spiked with Cd concentrations of 0, 10, 20, 30, 40 and 50 mu mol/kg soil. The root and shoot Cd contents increased, while Mg, Ca and Fe contents mainly decreased at higher Cd levels, and preferentially in the sensitive cultivar. Interestingly, the K contents increased in roots of cv. 3062 at low Cd treatments. The Cd stress caused acidosis of the maize root exudates predominantly in cv. 3062. The concentration of various organic acids was significantly increased in the root exudates of cv. 3062 with applied Cd levels. This effect was diminished in cv. 31P41 at higher Cd levels. Cd exposure increased the relative membrane permeability, anthocyanin (only in cv. 3062), proline contents and the activities of peroxidases (POD) and superoxide dismutase (SOD). The only exception was the catalase activity, which was diminished in both cultivars. Root Cd contents were positively correlated with the secretion of acetic acid, oxalic acid, glutamic acid, citric acid, and succinic acid. The antioxidants like POD and SOD exhibited a positive correlation with the organic acids under Cd stress. It is likly that a high exudation of dicarboxylic organic acids improves nutrient uptake and activities of antioxidants, which enables the tolerant cultivar to acclimatize in Cd polluted environment.

Place, publisher, year, edition, pages
2017. Vol. 141, 216-225 p.
Keyword [en]
Cd tolerance, Rhizobox, Rhizosphere, Root exudates, Zea mays
National Category
Earth and Related Environmental Sciences Environmental Health and Occupational Health
Identifiers
URN: urn:nbn:se:su:diva-144774DOI: 10.1016/j.ecoenv.2017.03.027ISI: 000400880900029PubMedID: 28349873OAI: oai:DiVA.org:su-144774DiVA: diva2:1127552
Available from: 2017-07-17 Created: 2017-07-17 Last updated: 2017-07-17Bibliographically approved

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Lindberg, Sylvia
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Department of Ecology, Environment and Plant Sciences
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