摘要：采用培养皿滤纸萌发法研究 5 种不同浓度 CrCl3（150 mg/L、300 mg/L、 450 mg/L、600 mg/L、750 mg/L）胁迫对玉米、小麦、蜀葵三种植物种子萌发及 生理指标的影响。结果表明，随着 CrCl3 浓度增长，三种植物的发芽率呈先上升 后降低的趋势，在 150mg/L 的时候达到最大值，在 750 mg/L 的时候发芽率最低。 与对照组相比，随着浓度的增长，玉米种子第一天到第五天的发芽率依次下降了 10%、24%、-4%、37%；小麦依次下降了 25%、33%、33%、44%、46%；蜀葵依次下 降了 13%、12%、9%、6%、7%。浓度为 450 mg/L 以上的 CrCl3 胁迫对种子萌发具 有抑制作用。浓度为 0-450mg/L 的 CrCl3 胁迫对种子萌发及胚根、胚芽的生长具 有一定的增效效应，在 150mg/L 的时候达到最大值，与对照组相比，随着浓度的 增长，玉米种子第一天到第五天的根长依次增长了 3%、14%、30%、13%；小麦依 次增长了-9%、4%、4%、0.01%、3%；蜀葵依次增长了 1%、2%、7%、5%、5%。随 着 CrCl3 浓度增大，三种植物的可溶性糖分和蛋白质含量均表现为先上升后下降 的趋势，其中玉米可溶性糖在 600mg/L 浓度时达到最大值，与对照比，随着浓度 的增长，玉米第一天到第三天的可溶性含量依次增长了 18%、7%、7%；玉米在 750mg/L 的时候可溶性糖含量最少，第一天到第三天依次降低了 3%、5%、10%。 小麦在 150mg/L 的时候可溶性糖含量最大，第一天到第三天依次增长了 5%、3%、 3%；小麦在 450mg/L 的时候可溶性糖含量最少，第一天到第三天依次减少了 1%、66328

7%、7%。玉米可溶性蛋白质在 450mg/L 的时候达到最大值，第一天到第三天依次 增长了 19%、10%、7%；小麦增长了 12%、5%、6%。玉米在 600mg/L 的时候达到最 小，依次减少了-4%、-5%、-1%；小麦依次减少了-2%、1%、-3%。 

毕业论文关键词: CrCl3 胁迫；种子萌发；生理指标； 

Effects of heavy metal chromium on Seed Germination and physiological indexes of three plants

Abstract: The effects of six different concentrations of CrCl3 （0mg/L、 150 mg/L、300 mg/L、450 mg/L、600 mg/L、750 mg/L、）on seed germination 

and physiological indexes of maize, wheat and hollyhock were studied by using culture paper filter germination method. The results showed that the germination rate, germination potential and germination index of the three plants increased first and then decreased with the increase of CrCl33 stress concentration, and reached the maximum at 150 mg / L. At 750 mg / L The germination rate was the lowest. Compared with the blank control group, the corn seeds decreased by 10%, 24%, -4% and 37% respectively in the first day to the fifth day with the increase of the concentration, and the wheat decreased by 25% %, 33%, 44% and 46% respectively. The contents of Shalu were decreased by 13%, 12%, 9%, 6% and 7% respectively. CrCl3 stress above 450 mg / L could inhibit seed germination. CrCl3 stress at 0-450 mg / L had a synergistic effect on seed germination and radicle growth, and reached the maximum at 150 mg / L. Compared with the blank control group, The growth of corn seeds increased by 3%, 14%, 30% and 13% in the first day to the fifth day, while the wheat increased by -9%, 4%, 4%, 0.01% and 3% respectively. 1%, 2%, 7%, 5%, 5%. With the increase of CrCl¬3 concentration, the soluble sugar content and protein content of the three plants showed the trend of increasing first and then decreasing, and the soluble sugar of maize reached the maximum at 600mg / L, and compared with the blank group. The first day to the third day of corn increased by 18%, 7%, 7%; corn at 750mg / L when the soluble sugar content of the least, the first day to the third day in turn decreased by 3%, 5 %, 10%. The content of soluble sugar in wheat was the highest at 150mg / L, and increased by 5%, 3% and 3% in the first day to the third day. The soluble sugar content of wheat was the lowest at 450mg / L, the first day to the third day Followed by a decrease of 1%, 7%, 7%. Corn soluble protein reached a maximum at 450 mg / L, increasing by 19%, 10% and 7% in the first day to the third day; wheat increased by 12%, 5% and 6%. Maize at 600mg / L to reach the minimum, followed by a decrease of