Effect of different nitrogen forms on the toxicity of Zn in wheat seedling root: a modeling analysis

Wang, Yi-Min, Wang, Peng, Hao, Xiu-Zhen, Zhou, Dong-Mei and Li, Ji-Zhou (2017) Effect of different nitrogen forms on the toxicity of Zn in wheat seedling root: a modeling analysis. Environmental Science and Pollution Research, 24 23: 18896-18906. doi:10.1007/s11356-017-9495-2

Author Wang, Yi-Min
Wang, Peng
Hao, Xiu-Zhen
Zhou, Dong-Mei
Li, Ji-Zhou
Title Effect of different nitrogen forms on the toxicity of Zn in wheat seedling root: a modeling analysis
Journal name Environmental Science and Pollution Research   Check publisher's open access policy
ISSN 1614-7499
Publication date 2017-08-01
Sub-type Article (original research)
DOI 10.1007/s11356-017-9495-2
Open Access Status Not yet assessed
Volume 24
Issue 23
Start page 18896
End page 18906
Total pages 11
Place of publication Heidelberg, Germany
Publisher Springer
Language eng
Subject 2304 Environmental Chemistry
2310 Pollution
2307 Health, Toxicology and Mutagenesis
Abstract Heavy metal stress in culture media is always rhizotoxic. Our study aims to investigate the role of negative potential (ψ) at root cell membrane surface (CMs) on modeling Zn toxicity to wheat seedling roots and to examine the effects of different nitrogen forms (NH and NO ) on ψ and Zn rhizotoxicity. Solution culture experiments were conducted to measure the root elongation and Zn accumulation under Zn exposure. The role of two nitrogen forms in affecting Zn toxicity was compared, giving particular consideration to ψ and Zn activities at CMs ({Zn}). Results showed that NH alleviates Zn rhizotoxicity and NO increases Zn rhizotoxicity. In modeling the rhizotoxicity, root length correlated better with {Zn} than {Zn}, and the predictive accuracy (r) of NH treatment increased from 0.748 to 0.917 when incorporation of {Zn} and {Ca} into analysis. Oppositely, ψ played a limited role in modeling Zn rhizotoxicity and bioavailability in NO treated medium (r = 0.609). Moreover, higher concentration of Zn in roots was found in NO treatment, compared with the NH treatment. ψ rather than the rhizotoxicity data correlated better with Zn accumulation especially in the NO treatment (r > 0.7), which meant the electrical driving force at CMs playing a dominant role in modeling the metal accumulation. In conclusion, the alleviatory role of NH on Zn toxicity and uptake was well explained and modeled by electrostatic effects at CMs. Though our data do not explore mechanisms for the NO -Zn interactions, we propose that ψ worked better in affecting the driving force for root Zn uptake, than influencing metal bioavailability at CMs.
Keyword Ammonium
Cell membrane surface potential
Root growth
Zn accumulation
Zn toxicity
Q-Index Code C1
Q-Index Status Provisional Code
Grant ID 31172034
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: HERDC Pre-Audit
School of Agriculture and Food Sciences
Version Filter Type
Citation counts: TR Web of Science Citation Count  Cited 0 times in Thomson Reuters Web of Science Article
Scopus Citation Count Cited 1 times in Scopus Article | Citations
Google Scholar Search Google Scholar
Created: Mon, 04 Sep 2017, 01:00:49 EST by Web Cron on behalf of Learning and Research Services (UQ Library)