干旱区生态环境知识资源中心(Arid): Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars

Arid

DOI	10.1016/j.scitotenv.2019.134887
	Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars
	Ondrasek, Gabrijel 1,2; Romic, Davor 1; Rengel, Zed 2
通讯作者	Ondrasek, Gabrijel
来源期刊	SCIENCE OF THE TOTAL ENVIRONMENT
ISSN	0048-9697
EISSN	1879-1026
出版年	2020
卷号	702
英文摘要	In contrast to some salts such as chlorides (Cl) that enhance cadmium (Cd) phyto-uptake, complex soil organics like humates (HA) potentially minimise Cd uptake, but are depleted in soils low in organic matter. Organically-depleted and salt-affected areas frequently coincide in (semi)arid agroecosystems where inappropriate management practices may load topsoils with Cd. We evaluated the impact of HA (0-100 mg/kg) and NaCl (0-60 mM) in Cd-contaminated (0-5 mg/kg) soil on the chemical changes in the rhizosphere and Cd uptake by two radish (Raphanus sativus L.) cultivars. In the rhizosphere solution the significant HAxCd interaction resulted in a decrease in Cd concentration with increasing HA rates, whereas the NaClxCd interaction was brought about by an increase in Cd concentration with NaCl rising. Also, the NaClxCd interaction increased Cd concentration in radish hypocotyl with increasing NaCl addition; in contrast, the HAxCd interaction reduced Cd concentration in hypocotyl, notably at the highest Cd rate, with increasing soil humification. The addition of HA acted as a biostimulant in both radish cultivars and decreased Cd accumulation (up to 44%), whereas NaCl stress reduced the root growth and enhanced total Cd accumulation (by almost 50%). Dose-dependent severity of Cd toxicity was confirmed in both cultivars by reduced growth and progressive (up to 2 orders of magnitude) Cd accumulation (vs. uncontaminated soil). Ion speciation modelling suggested that chemistry of deprotonated humates and chlorides is crucial for complexation of the most bioavailable Cd2+ species, thus driving Cd mobility within the soil matrix, including uptake by plants. Detected differences between the tested cultivars (e.g. lower Cd concentration in Sparkler vs. Cherry Belle) and their impacts on rhizosphere chemistry and Cd soil-plant acquisition/root-hypocotyl-shoot (re)distribution, suggest that genetic improvements (by developing and introducing salt- and/or metal-resistant varieties) should be exploited in phytoremediation of contaminated soils or for minimising metal accumulation in sustainable food production. (C) 2019 Elsevier B.V. All rights reserved.
英文关键词	Humates Chloride salinity Humate-cadmium interaction Chloride-cadmium interaction Cadmium contamination
类型	Article
语种	英语
国家	Croatia ; Australia
收录类别	SCI-E
WOS记录号	WOS:000500590700037
WOS关键词	HUMIC SUBSTANCES ; ORGANIC-MATTER ; ACID ; ACCUMULATION ; SALINITY ; ZN ; CD ; COMPOST ; GROWTH ; ZINC
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
EI主题词	2020-02-01
来源机构	University of Western Australia
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/312699
作者单位	1.Univ Zagreb, Fac Agr, Svetosimunska C 25, Zagreb 10000, Croatia; 2.Univ Western Australia, UWA Sch Agr & Environm, 35 Stirling Highway, Perth, WA 6009, Australia
推荐引用方式 GB/T 7714	Ondrasek, Gabrijel,Romic, Davor,Rengel, Zed. Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars[J]. University of Western Australia,2020,702.
APA	Ondrasek, Gabrijel,Romic, Davor,&Rengel, Zed.(2020).Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars.SCIENCE OF THE TOTAL ENVIRONMENT,702.
MLA	Ondrasek, Gabrijel,et al."Interactions of humates and chlorides with cadmium drive soil cadmium chemistry and uptake by radish cultivars".SCIENCE OF THE TOTAL ENVIRONMENT 702(2020).