镉·铜胁迫对不同品种水稻种子萌发及幼苗生长的影响

[目的]探索重金属镉、铜对水稻的伤害。[方法]以水稻品种先农10号2、0号和40号为试材,研究了不同浓度的氯化镉和硫酸铜处理对种子的发芽和幼苗生长的影响。[结果]在重金属镉、铜胁迫条件下3个品种的发芽率和发芽势与对照差异不大,根的伸长受到明显抑制。先农20号在镉、铜浓度为5和10 mg/L时以及先农40号在镉和铜浓度分别为10和30 mg/L时,苗高均极显著降低。3个水稻品种的生物量的变化趋势与株高基本一致。镉、铜含量分别为5和10 mg/L时,幼苗叶绿素含量显著低于对照。先农20号在镉为5mg/L时及先农10号和40号在镉为10 mg/L时,幼苗的根系活力均显著低于对照。[结论]重金属胁迫对水稻种子的萌发影响不大,对幼苗生长影响较大。

Effect of Cadmium and Copper Stress on Seed Germination and Seedling Growth of Different Rice Varieties

[Objective] The study was to give a theoretical base to prevent the harm of heavy metals Cd and Cu to rice.[Method] With the rice varieties Xiannong 10,20 and 40 as tested materials,the influences of cadmium chloride and copper sulfate treatments with different concn on seed germination and seedling growth were investigated. [Result] The seed germination rate and vigor of 3 varieties had a little difference from that of CK under the stress of cadmium and copper and the prolongation of root was restrained obviously.The seedling heights of Xiannong 20 treated with cadmium and copper at 5 and 10 mg/L resp.and that of Xiannong 40 treated with cadmium and copper at 10 and 30 mg/L resp.were all decreased significantly.The biomass of 3 rice varieties changed as that of plant height.When cadmium and copper was 5 and 10 mg/L resp,the chlorophyll content of seedling was significantly lower than that of CK.The seedling root vigor of Xiannong 20 treated with cadmium at 5 mg/L and that of Xiannong 10 and Xiannong 40 treated with cadmium at 10 mg/L were all significantly lower than that of CK.[Conclusion] The influence of heavy metal stress on rice seed germination was little and was bigger on seedling growth.