Cu^(2+)·Cd^(2+)胁迫对番茄幼苗生长及过氧化物酶活性的影响

Effects of Cu^(2+) and Cd^(2+) Stress on Growth and POD Activity of Tomato Seedling

利用不同浓度Cu2+、Cd2+处理2个番茄品种的幼苗,研究重金属离子对番茄苗期生长和叶片过氧化物酶(POD)活性的影响,比较Cu2+、Cd2+两种重金属离子对番茄幼苗的毒性差异及2个番茄品种之间的差异。试验结果表明,Cu2+、Cd2+在较低浓度时能够促进番茄幼苗生长,提高POD活性;而随着浓度提高抑制作用明显。且Cd2+的影响比Cu2+明显,2个不同番茄品种间也存在差异。

The growth situation and peroxidase （POD） of seedlings of two tomato cuhivars were investigated under the stress of different concentrations of Cu^2＋ and Cd^2＋ , The toxicity differences of Cu^2＋ and Cd^2＋ to tomato seedlings andthe corresponding differences between two tomato cultivars were ob- served through the stress trial with the above two heavy metal ions. The results showed that low concentration of Cu2 ＋ and Cd^2 ＋ could promote the growth and could enhance the POD activity of tomato seedlings, while high concentration Cu^2＋ and Cd^2 ＋could inhibit seedling growth and POD activity of tomato seedlings, Cd^2 ＋ functioned more obviously than that of Cu^2 ＋ , two tomato cultivars also presented difference in response to heavy metal stress.