【摘要】 试验采用不同浓度(0,0 1,5,30,100mg/L)的CdCl2溶液模拟水体镉污染,研究其对水稻种子和幼株的影响。结果表明:Cd2+明显抑制水稻幼株的生长,降低株高和根长,减少根数。Cd2+使根系活力和硝酸还原酶(NR)活性降低,游离氨基酸、可溶性蛋白含量明显减少,严重干扰了水稻幼株的代谢过程。此外,高浓度的Cd2+(100mg/L)引起水稻幼株根尖变褐,呈现中毒反应。更多还原

【Abstract】 This paper deals with the effect of simulative water Cd pollution on growth and some physiological indicators of young rice plants. Young plants were treated with CdCl₂ at: 0（ck）, 0.1, 5, 30, （100 mg/L） concentrations. Results showed that Cd²⁺ inhibited growth of rice seedlings significantly, plant height was shortened and root number was reduced. Chlorophyll content and photosynthetic rate （Pn） of young plants were reduced significantly by Cd²⁺.Root activity and nitrate reductase（NR）, content of free amino acids, soluble sugar and soluble protein were reduced. Besides, root tops of young plants were browned with higher concentration Cd²⁺（100 mg/L）.更多还原