Journal
ENVIRONMENTAL AND EXPERIMENTAL BOTANY
Volume 128, Issue -, Pages 11-17Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.envexpbot.2016.04.001
Keywords
Aerenchyma; Apoplasmic barriers; Antimony; Casparian band; Root anatomy; Root architecture; Suberin lamellae
Categories
Funding
- Sciex project [13.024]
- Slovak Research and Development Agency [APVV SK-SRB 2013-0021]
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Silicon (Si) has often been found to alleviate phytotoxic effects of trace elements. Here, we investigated whether it can also mitigate negative effects of the metalloid antimony (Sb) on plant growth. Young maize seedlings (Zea mays, hybrid Valentina) were hydroponically grown in the presence of various antimonate Sb(OH)(6)(-) concentrations (0-30 mg kg(-1)) and one concentration of Si (2.5 mM). Antimonate did not influence root biomass but retarded root growth, leading to shorter and thinner roots. The increase in root mass density was in line with a decrease in root cortical aerenchyma. Silicon addition mitigated the negative Sb effects on root growth and architecture and enhanced aerenchyma formation. It did not affect root Sb concentrations, but with increasing Sb exposure level it first increased and then reduced the small fraction of Sb that was translocated into the shoots. In turn, antimonate reduced Si accumulation by the roots, but did not inhibit root-to-shoot translocation of Si. The simultaneous occurrence of positive and negative interactions between Sb and Si indicates that they involved multiple mechanisms. (C) 2016 Elsevier B.V. All rights reserved.
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