期刊
ENVIRONMENTAL POLLUTION
卷 240, 期 -, 页码 764-774出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2018.05.022
关键词
Aluminum toxicity; Boron; Cellulose; Pectin; Trifoliate orange rootstock
资金
- National Natural Science Foundation of China [41271320]
- Fundamental Research Funds for the Central Universities [2017PY055]
Aluminum (Al) phytotoxicity is a major limitation in the production of crops in the soils with pH <= 5. Boron (B) is indispensable nutrient for the development of higher plants and B role has been reported in the alleviation Al toxicity. Trifoliate orange rootstock was grown in two B and two Al concentrations. The results of the present study showed that Al toxicity adversely inhibited root elongation and exhibited higher oxidative stress in terms of H2O2 and O-2(-) under B-deficiency. Additionally, the X-ray diffraction (XRD) analysis confirmed the increase of the cellulose crystallinity in the cell wall (CW). Al-induced remarkable variations in the CW components were prominent in terms of alkali-soluble pectin, 2-keto-3-deoxyoctonic acid (KDO) and the degree of methyl-esterification (DME) of pectin. Interesting, B supply reduced the pectin (alkali-soluble) under Al toxicity. Moreover, the results of FTIR (Fourier transform infrared spectroscopy) and C-13-NMR (C-13 nuclear magnetic resonance) spectra revealed the decrease of carboxyl groups and cellulose by B application during Al exposure. Furthermore, B supply tended to decrease the Al uptake, CW thickness and callose formation. The study concluded that B could mitigate Al phytotoxicity by shielding potential Al binding sites and by reducing Al induced alterations in the CW cellulose and pectin components. (C) 2018 Elsevier Ltd. All rights reserved.
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