钙对水稻幼苗镍毒害的缓解效应

Alleviating Effects of Calcium on Nickel Toxicity Towards Rice Seedlings

采用溶液培养法研究了镍对水稻幼苗生长的影响,以及钙对镍毒害的缓解效应。结果表明,0.1、1.0、10mmol·L-1Ni2+处理下,水稻幼苗的生长表现出明显的抑制,处理浓度愈大,抑制愈明显。加入Ca2+不同程度减轻了镍毒害,缓解程度依镍处理浓度而异。5.0mmol·L-1Ca2+的缓解作用稍好于1.0mmol·L-1Ca2+。Ca2+能基本解除0.01mmol·L-1Ni2+对幼苗地上部及根系的生长抑制作用,明显缓解0.1mmol·L-1Ni2+处理对幼苗的毒害。但随镍浓度的升高,Ca2+的这种缓解效应有限。

A test using solution culture was applied to study on effects of excessive nickel on the growth of rice seedlings and alleviating effects of calcium on nickel toxicity towards rice seedlings in this paper. The results showed that nickel inhibited significantly the growth of rice seedlings at concentrations of 0.01,0.1,1.0,10 mmol· L- 1.The more the concentrations of nickel applied, the more the growth of rice seedlings was inhibited. Adding calcium to culture solution alleviated nickel toxicity in varying degrees, which depended on the concentrations of nickel used. The alleviating effect of 5.0 mmol· L- 1 Ca2+ was better than that of 1.0 mmol· L- 1 Ca2+ , but there was no significant difference between them. The inhibition of growth for stems and roots at 0.01 mmol· L- 1 Ni2+ was almost offset by either 1.0 mmol· L- 1 or 5.0 mmol· L- 1 Ca2+ , and the toxicity of 0.1 mmol· L- 1 Ni2+ towards rice seedlings was also significantly alleviated. However, the alleviating effects of calcium on nickel toxicity were limited when the concentrations of nickel increased.