期刊
PLANT PHYSIOLOGY AND BIOCHEMISTRY
卷 110, 期 -, 页码 50-58出版社
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2016.09.013
关键词
Helianthus annuus; Nano-CeO2; Ce uptake; Boron interaction; Growth parameters; Oxidative stress; Toxicity symptoms
资金
- Italian National Research Council-Institute of Ecosystem Studies, CNR, campus in Pisa, Italy
- National Science Foundation
- Environmental Protection Agency [DBI-1266377]
- National Institutes on Minority Health and Health Disparities (NIMHD), a component of the National Institutes of Health (NIH) [2G12MD007592]
- USDA [2016-38422-67021-24985]
- NSF [CHE-0840525, DBI-1429708]
- NSF ERC on Nanotechnology-Enabled Water Treatment [EEC-1449500]
- Academy of Applied Science/US Army Research Office, Research, and Engineering Apprenticeship program (REAP) at UTEP [W11NF-10-2-0076, 13-7]
- STARs programs of the University of Texas System
- Dudley family for the Endowed Research Professorship
Little is known about the interaction of nanoparticles (NPs) with soil constituents and their effects in plants. Boron (B), an essential micronutrient that reduces crop production at both deficiency and excess, has not been investigated with respect to its interaction with cerium oxide NPs (nano-CeO2). Considering conflicting results on the nano-CeO2 toxicity and protective role as antioxidant, their possible modulation on B toxicity in sunflower (Helianthus annuus L.) was investigated. Sunflower was cultivated for 30 days in garden pots containing original or B-spiked soil amended with nano-CeO2 at 0-800 mg kg(-1). At harvest, Ce and B concentrations in tissues, biomass, and activities of stress enzymes in leaves were determined. Results showed that in the original soil, Ce accumulated mainly in roots, with little trans location to stems and leaves, while reduced root Ce was observed in plants from B-spiked soil. In the original soil, higher levels of nano-CeO2 reduced plant B concentration. Although morphological effects were not visible, changes in biomass and oxidative stress response were observed. Sunflower leaves from B-spiked soil showed visible symptoms of B toxicity, such as necrosis and chlorosis in old leaves, as well as an increase of superoxide dismutase (SOD) activity. However, at high nano-CeO2 level, SOD activity decreased reaching values similar to that of the control. This study has shown that nano-CeO2 reduced both the B nutritional status of sunflower in original soil and the B phytotoxicity in B-spiked soil. (C) 2016 Elsevier Masson SAS. All rights reserved.
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