不同品种苋菜对砷的吸收能力及植株磷砷关系研究

利用水培试验方法,研究了不同品种苋菜对As(Ⅴ)的耐性、富集能力及其植株中P、As含量间的关系。结果表明,当营养液中As(Ⅴ)浓度为2 mg·L~(-1)时,As(Ⅴ)促进了花红柳叶、红柳叶苋菜的生长,但对其他品种苋菜的生长有抑制作用;当营养液中As(Ⅴ)浓度达到4 mg·L~(-1)时,As(Ⅴ)对所有品种苋菜的生长都有明显的抑制作用。两种As(Ⅴ)浓度处理下,苋菜不同品种地上部砷含量均为白圆叶苋菜≈红柳叶苋菜花红柳叶苋菜花红苋菜严选红圆叶苋菜。当营养液中As(Ⅴ)浓度为2 mg·L~(-1)时,苋菜地上部P含量与As含量有显著相关性(r=0.881),当营养液中As(Ⅴ)浓度为4 mg·L~(-1)时地上部P、As含量间的相关性不显著,但相关系数达到0.816。苋菜种子中P含量与两种As(Ⅴ)浓度处理下地上部As含量呈显著或极显著相关性(r=0.937,0.971)。

Arsenic uptake by different species of amaranth and the relationship between arsenic and phosphate in amaranth

In this study, a hydroponic experiment was conducted to investigate the resistance and accumulation of arsenic(As)in five ama-ranth species at two exposure concentrations of As(2 mg·L-1, 4 mg·L-1)as well as correlation relationship between arsenic and phosphorus contents in amaranth. At the As concentration of 2 mg·L-1, the growths of Huahongliuye and Hongliuye amaranth were improved, but the other three species were inhibited compared with the control without As addition. Differently, the growths of all the five species were signifi-cantly inhibited when the concentration of As increased to 4 mg·L-1. For the two investigated As treatments, As accumulation in the shoot of the five amaranth species ranked in the same order as follows:Baiyuanye>Hongliuye>Huahongliuye>Huahong>Yanxuanhongyuanye. Fur-thermore,the content of phosphorus in amaranth shoot significantly correlated with that of As(r=0.881)at the As concentration of 2 mg·L-1, but insignificant correlation occurred at the As concentration of 4 mg·L-1(r=0.816). Additionally, significant correlation between phospho-rus content in amaranth seed and that of As in amaranth shoot was also observed for the two investigated As treatments at 2 mg·L-1(r=0.937)and 4 mg·L-1(r=0.971).