Effects of As on As uptake,speciation,and nutrient uptake by winter wheat (Triticum aestivum L.) under hydroponic conditions

• Published in: 环境科学学报（英文版） Vol. 20; no. 3; pp. 326 - 331
• Main Authors: LIU Quanji, HU Chengxiao, TAN Qiling, SUN Xuccheng, SU Jingjun, LIANG Yuexiang
• Format: Journal Article
• Language: English
• Published: Microelement Research Center,Huazhong Agricultural University,Wuhan 430070,China 2008
• Subjects: arsenic (As); winter wheat; nutrients; speciation
• ISSN: 1001-0742; 1878-7320
• DOI: 10.3321/j.issn:1001-0742.2008.03.012

X7; A hydroponic experiment was conducted to investigate the effects of arsenic (As) stress on growth,nutrition and As uptake,and spcciation in shoots and roots of winter wheat (Triticum aestivum L.).Winter wheat has high tolerance to As.Most As is accumulated in the roots,and an As concentration of 4,421 mg/kg was observed at a solution concentration of 20 mg/L As.Arsenic concentrations in roots were approximately 40-100 times greater than those in shoots.Arsenic in winter wheat roots and shoots occurred as both As3+ and As5+ species,although As3+ was the main species in winter wheat tissues.Arsenic significantly decreased the biomass of winter wheat shoots and roots and affected absorption and transport of micro- and macro-elements in winter wheat tissue.Arsenic treatment significantly increased the concentrations of total Magnesium (Mg) and calcium (Ca) in shoots and enhanced the transport of Mg and Ca from roots to shoots but decreased potassium (K),nitrogen (N),and phosphorus (P) concentrations in both shoots and roots,particularly the concentration of P.Concentrations of iron,copper,and zinc in winter wheat shoots were negatively related to As rates,with correlation coefficients (R2) of 0.93,0.94,and 0.97,respectively.