镉胁迫下磷酸二铵对小麦生长及吸收镉的影响

Effects of Application of DAP on the Growth of Wheat and Absorption of Cadmium Under Cadmium Stress

以黄土和小麦为供试对象,通过盆栽试验研究了不同Cd胁迫水平下施用(NH4)2HPO4对小麦生长及Cd富集、转移的影响。结果表明,Cd胁迫对小麦的生长表现为低促高抑,Cd胁迫下施用(NH4)2HPO4可促进小麦的生长,尤其是茎叶的生长;小麦各部位的Cd含量均随着土壤Cd胁迫水平的升高而升高,且根系>茎叶>籽粒。施用(NH4)2HPO4能促进小麦对Cd的吸收,对根系和籽粒的促进作用大于茎叶;小麦各部位对Cd的富集能力均随着土壤Cd胁迫水平的升高而先增加后减小,而茎叶的转移能力先降低后升高,籽粒反之。施用(NH4)2HPO4显著促进根系对Cd的富集和茎叶对Cd的转移。

A field pot experiment was conducted for loess and wheat to study the effects of application of ammonium phosphate on the growth of wheat and translocation and accumulation of Cadmium under different stress levels. The results indicated that the influence of Cadmium stress on the growth of wheat showed phenomena of high concentration's inhibition and low promotion. The application of ammonium phosphate under Cadmium stress could promote the growth of wheat, particularly were the shoots. Cadmium contents of various parts of wheat were increased with the increasing Cadmium stress levels of the soil, which ranking as roots > shoots > grains. The application of ammonium phosphate could promote the absorption of Cadmium, stimulate the absorption of roots and grains to greater extent than shoots. The Cadmium accumulation ability of various parts of wheat increased firstly and then decreased with the increase of Cadmium stress levels in test soil, and the translocation ability of shoots firstly decreased and then increased. Conversely, the translocation ability of seeds first increased and then decreased. The application of ammonium phosphate can significantly promote the translocation and accumulation of Cadmium in the roots and shoots of wheat in loess.