Effect of Pb2+Stress on Poa pratensis L.Seeds Germination and Seedlings Growth
[Objective]The aim is to investigate the effect of heavy metal lead on the germination of Poa pratensis L.seeds.[Method]P.pratensis L.seeds were taken as test material the effect of Pb2+stress on its seed of seeding that were cultuerd in different concentrations(0,20,40,60,80 mg/L)of Pb2+were discussed.[Results]Pb2+stress exhibited inhibitory effects on P.pratensis L.The plant seeds germination rate,germination index was decreased with the Pb2+concentration increased;.but that was obvious change.Daily germination index peak in day 3.With the increasing of Pb2+concentration,the root length,length of stem,contents of chlorophyll a,chlorophyll b were decreased.contents of carotenoid increased in 80 mg/L.[Conclusion]The germination rate of P.pratensis L.seeds is less affected within the range of Pb2+concentration of 20-80 mg/L.The content of chlorophyll and carotenoids,as well as the growth of roots and stems of seedlings,are inhibited to a certain extent.
Pb2+stressPoa pratensis L.Germination rateDaily germination indexGermination indexContents of chlorophyllContents of carotenoid
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万方数据
