Effects of root agent and water stress on wheat root elongation and Cd uptake and translocation in heterogeneous Cd contaminated soil

被引：0
|
作者：
Lei X. [1 ]
Wang M. [1 ]
Zheng H. [1 ]
Li S. [1 ]
Chen S. [1 ]
机构：
[1] Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing
来源：
Earth Science Frontiers | 2019年 / 26卷 / 06期
关键词：
Cd-contaminated soil; Root agent; Root elongation; Water stress management; Wheat;
D O I：
10.13745/j.esf.sf.2019.10.6
中图分类号：
学科分类号：
摘要：
We investigated the influence of root agent and water stress on root elongation of wheat, and Cd uptake and translocation by wheat, in heterogeneous Cd-contaminated soil. We prepared heterogeneous Cd contaminated soils at three soil depths (0-6, 7-12 and 13-18 cm) using rhizobox method. In a whole growth culture experiment, we studied the effect of root agent at three addition levels (0.1%, 0.2% and 0.4%), and the effect of three water stress treatments (60%, 50% and 40% MWHC (maximum water holding capacity)), on Cd uptake and translocation by wheat. The results indicated that root growth of wheat, compared with control, was enhanced by both treatments which significantly increased the total root length (cm) and root surface (cm2). In detail, the total root length in the subsoil (13-18 cm depth) increased by 63.2%-205.9% and 69.1%-91.2% by root agent and water stress treatments, respectively. Root agent application promoted the wheat tillering numbers and increased the biomass of wheat grain by 5.6%-50.3%. In terms of Cd uptake by wheat, the result showed that, except the 40% MWHC water stress treatment (WS3), Cd concentrations in shoots and grain of wheat were significantly decreased (P<0.05) by both treatments. Compared with control, the decreases ranged in 24.0%-41.5% and 23.0%-42.7%, respectively, with the best effect observed at the 0.4% additional level for root agent. The effect of different treatments on the Cd decrement in wheat grain followed the order of RA3≈RA2>WS2≈RA1≈WS1>WS3. Based on the above results, we concluded that root agent and water stress treatments can be recommended for remediation of field soils contaminated by heterogeneous heavy metals. © 2019, Editorial Office of Earth Science Frontiers. All right reserved.
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页码：95 / 102
页数：7
相关论文
共 8 条
  • [1] Hodge A., The plastic plant: root responses to heterogeneous supplies of nutrients, New Phytologist, 162, pp. 9-24, (2011)
  • [2] Brooker R.W., Plant-plant interactions and environmental change, New Phytologist, 171, pp. 271-284, (2009)
  • [3] Li R., Lan S.Y., Xu Z.X., The effect of exogenous hormones on the programmed cell death of endosperm and the grain filling in wheat, Hubei Agricultural Sciences, 5, pp. 26-27, (2004)
  • [4] Huang S.D., Yao J.B., Yao G.C., Et al., Study on wheat morphology and yield-improving effects of seed-dressing with paclobutrazol, Jiangsu Agricultural Sciences, 2, pp. 16-18, (2001)
  • [5] Yang W.B., Wang Z.L., Yin Y.P., Et al., Effects of spraying exogenous ABA or GA on the endogenous hormones concentration and filling of wheat grains, Scientia Agricultura Sinica, 44, 13, pp. 2673-2682, (2011)
  • [6] Naik P.K., Mohapatra P.K., Ethylene inhibitors enhancedsucrosesynthase activity and promoted grain filling of basalrice kernels, Functional Plant Biology, 27, pp. 997-1008, (2000)
  • [7] Mohapatra P.K., Naik P.K., Patel R., Ethylene inhibitors improve dry matter partitioning and development of late flowering spikelets on rice panicles, Functional Plant Biology, 27, pp. 311-323, (2000)
  • [8] Wang Z.W., Nan Z.R., Wang S.L., Et al., Accumulation and distribution of cadmium and lead in wheat(Triticum aestivum L.)grown in Contaminated Soils from the Oasis, North West China, Journal of the Science of Food and Agriculture, 91, 2, pp. 377-384, (2011)
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