溶液pH值对水稻幼苗Cd吸收的影响(英文)

Effect of solution pH on Cd absorption of rice seedlings

采用含10mg/L Cd的营养液培养水稻幼苗,设置pH4.0至7.5的不同处理以研究溶液pH对幼苗Cd吸收的影响。结果表明:在pH5.0时,两个水稻品种茎的Cd含量和累积量达到最高;根的Cd含量和累积则随pH值上升而增加,至pH7.5时达最大值。这两种变化趋势都能用二次方程加以描述。此外,Cd胁迫使水稻的鲜重和干重显著降低而MDA和蛋白质含量显著升高。因此,在一定Cd浓度下,溶液不同pH对水稻根和茎吸收Cd影响也不同,而10mg/L Cd抑制了水稻幼苗的生长。

The Cd uptake of rice seedlings was investigated as affected by the pH using a hydroponic experi ment. The Cadmium concentration of nutrient solution was 10 mg/L and the pH varied from 4.0 to 7. 5. The re. stilts showed that the content and accumulation of Cd in the shoot tissues of two rice varieties reached the maximum at pH ,5.0. In contrast, that in the root increased with the increase of solution pH and was the highest at pH 7.5 Both of two trends may be described well with quadratic equations. Moreover, Cadmium stress reduced the fresh and dry weight of rice tissues but increased the content of MDA and proteins significantly. Therefore, under the condition of certain concentration of Cd, the absorption of Cd in the shoot and root of rice could be differently affected by different solution pH, and 10 mg/L Cd inhibited the growth of rice seedlings.