La与La(POA)3对Cd胁迫绿豆幼苗生理活性的作用

[目的]探讨La及La(POA)3对Cd损伤绿豆幼苗的生理生态效应。[方法]以绿豆幼苗为试材,研究了La及La(POA)3对镉胁迫绿豆幼苗光合作用、碳水化合物和氮素代谢的影响。[结果]单一Cd(10 mg/L)胁迫下,绿豆幼苗的叶绿素含量、可溶性蛋白含量,NR活性下降,可溶性糖含量上升;5~30 mg/L的La及La(POA)3能明显促进绿豆幼苗生长,缓解Cd对绿豆幼苗的胁迫作用;高浓度(100 mg/L)La及La(POA)3对Cd污染的缓解作用都减弱;较低浓度(10、15、30 mg/L)的La(POA)3对Cd胁迫的缓解作用较La更明显;随着作用时间的延长,La及La(POA)3对Cd污染的缓解作用均逐渐下降。[结论]低浓度的La及La(POA)3能缓解Cd对绿豆幼苗的胁迫,而高浓度时有毒害作用。

Effects of La and La(POA)3 on Physiological Activity of Mung Bean Seedings Stressed by Cd

[Objective] The study was to explore the physiological and ecological effects of La and La(POA)3 on mung bean seedlings damaged by Cd.[Method] With mung bean seedling as tested material,the effects of La and La(POA)3 on photosynthesis,carbohydrate and nitrogen metabolism of mung bean seedlings stressed by Cd were studied.[Result] Under alone stress by Cd at10 mg/L,the content of chlorophyll and soluble protein and NR activity of mung bean seedling were decreased,and the soluble sugar content was increased.La and La(POA)3 at 5～30 mg/L could obviously promote the growth of mung bean seedling and relieve the stress of Cd on mung bean seedling.The mitigative effects of La and La(POA)3 with high concn.(100 mg/L) on Cd stress were all weakened.The mitigative effects of La(POA)3 with lower concn.(10,15 and 30 mg/L)on Cd stress was obvious than that of La.With the delay of action time,the mitigative effects of La and La(POA)3 on Cd stress were all decreased gradually.[Conclusion] La and La(POA)3 with low concn.could relieve the stress of Cd on mung bean seedlings,while they with high concn.had toxic effects.