Hormetic dose responses induced by lanthanum in plants

被引:92
作者
Agathokleous, Evgenios [1 ,2 ]
Kitao, Mitsutoshi [1 ]
Calabrese, Edward J. [3 ]
机构
[1] Forest Res & Management Org, Hokkaido Res Ctr, Forestry & Forest Prod Res Inst FFPRI, 7 Hitsujigaoka, Sapporo, Hokkaido 0628516, Japan
[2] Hokkaido Univ, Res Fac Agr, Kita 9 Nishi 9, Sapporo, Hokkaido 0608589, Japan
[3] Univ Massachusetts, Dept Environm Hlth Sci, Morrill 1,N344, Amherst, MA 01003 USA
关键词
Biological plasticity; Dose-response; Hormesis; Lanthanum; Stimulation; Stress; RARE-EARTH-ELEMENTS; FABA L. SEEDLINGS; ACID-RAIN; HORMESIS DATABASE; CADMIUM STRESS; GROWTH; RIVER; RICE; STIMULATION; ANTIOXIDANT;
D O I
10.1016/j.envpol.2018.10.007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Rare earth elements (REEs) have recently received particular attention due to their accumulation in the environment. Such heightened recognition prompted our evaluation of the possible occurrence of La-induced plant hormesis in the peer-reviewed literature. This study revealed 703 La-induced hormetic concentration/dose responses in plants, which were quantitatively and qualitatively assessed. The maximum (MAX) biological response to low La concentrations/doses is commonly below 150% of control response, with a geometric mean of 142% at 56 mu M (geometric mean). The geometric mean concentration of the no-observed-adverse-effect-level (NOAEL) was 249 mu M. The MAX:NOAEL distance was commonly below 5-fold, with a geometric mean of 4.5-fold. Hormetic concentration/dose responses varied as per the growth substrate pH, number of concentrations/doses below the NOAEL, and time window. These results provide a unique insight into the effects of low doses of La on plant growth, as well as offer means for improving experimental designs to assess low dose effects. (C) 2018 Elsevier Ltd. All rights reserved.
引用
收藏
页码:332 / 341
页数:10
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