Effects of Cr~(2+) on Seeds Germination and Seedlings Early Growth of Corn and Cucumber

With the indoor water cultivation methods,this paper studied the effects of different concertration chromium on seeds germination,seedlings growth and Chlorophyll content of corn and cucumber,and compared their differences of tolerance to chromium.The results showed that germination energy,germination rate,stress rate,vigor index,bud length of seedlings,root length,weight of buds and roots,and chlorophyll content of corn and cucumber showed upward tendency in low concentrations of chromium,such as 0.5 mg/L,1 mg/L,5 mg/L.When chromium concentration was 10 mg/L,seeds germination rate of corn and cucumber decreased,seedling growth were inhibited,and the inhibition for root was obvious than that of buds.The poison on corn occurred since 5 mg/L,the activity index decreased slowly.But cucumber seeds were poisoned at 10 mg/L chromium,and the activity index decreased very quickly.This phenomenon showed that corn seed had stronger tolerance than cucumber seeds for chromium.The most promotion for corn seedlings early growth was 0.5 mg/L,and for cucumber seeds was 1 mg/L.Chlorophyll a and chlorophyll b content of corn and cucumber seedlings were increased in low chromium concentration.Chlorophyll content of corn and cucumber seedlings began to decrease at 20 mg/L,and chlorophyll a content decreased more faster than that of chlorophyll b.