Influence of Zn on the Growth and Development of Pea Seedling under Hg Stress
WANG Li-Xin et al(Department of Biology,Changshu College of Technology,Changshu,Jiangsu 215500)
[Objective] The research was to study the antidotal effect of Zn on pea seedling under Hg stress.[Method] With pea as tested material,the influence of mixed solution of HgNO3 and ZnSO4 with different concn.on the seed germination rate,root length and stem length of pea seedling were studied.[Result] With the increase of Hg concn.,the growth of pea seedling had a trend of first promoting and then suppressing.When Hg was 150 mg/L,the seed germination rate,root length and stem length was decreased to the lowest,reducing by 31.70%,2.23 and 0.18 cm than that of CK resp.When Zn was ≤50 mg/L,the pea growth in different treatments were all better than that in treatment without adding Zn.When Zn was ≥100 mg/L,the pea growth in different treatments were all lower than that in treatment without adding Zn.When Zn was ≤100 mg/L,the cell number in dividing phase in each treatment was bigger than that of CK and when Zn was 20 mg/L,the cell aberration rate was lowest(0.57%).When Zn was 10 mg/L and Hg was 10 mg/L,the content of chlorophyll was most.When Hg was 10 mg/L,the gray scale value of POD was largest and was 207.86% of that of CK.[Conclusion] The best concn.of Zn for detoxication was 10 mg/L.
【CateGory Index】： S643.3