铬胁迫对大豆种子萌发和幼苗生长的影响

目的]为预防大豆早期铬伤害提供依据。方法]用不同浓度的铬处理大豆种子,研究铬对大豆种子萌发率、发芽势及幼苗生长的影响。结果]随着Cr6+浓度从0增至5mg/L,发芽率从91.44%增至92.59%,发芽势从89.13%增至89.54%。Cr6+浓度从10mg/L增至160mg/L时,发芽率和发芽势分别降至74.94%和73.64%。低浓度铬处理的大豆幼苗根长、芽长及生物量比对照有少许的增加。15mg/L的Cr6+抑制大豆幼苗的生长,且随着浓度的提高抑制效应逐渐增强。Cr6+浓度达到100mg/L时,根长与芽长分别为对照的28.61%、31.33%。Cr6+对大豆幼根生长的抑制作用大于对芽生长的抑制作用。结论]铬处理对大豆种子萌发及幼苗生长具有一个低浓度下的刺激效应和高浓度下的抑制效应,浓度10mg/L以下的铬对大豆种子萌发及幼苗生长有促进作用。

Effects of Chromium Stress on Seed Germination and Seeding Growth of Soybean

Objective The aim of the research was to provide basis for preventing chromium damage from soybean in early stage.Method Soybean seeds were treated with different concentrations of chromium to study the effect of chromium on seed germination rate and germination potential and seedling growth of Soybean.Result As the concentration of Cr6 increased from 0 to 5 mg/L,the germination rate was increased from 91.44 % to 92.59 % and the germination potential was increased from 89.13 % to 89.54 % resp.As the concentration of Cr6 increased from 10 mg/L to 160 mg/L,the germination rate and the germination potential reduced to 74.94 % and 73.64 % respectively.The root length,bud length and biomass of soybean treated with chromium were slightly increased than that of CK.Cr6 at the concentration of 15 mg/L inhibited the growth of soybean seedling and the inhibition effect was gradually strengthened with the increasing of chromium concentration.When the concentration of Cr6 reached 100 mg/L,the root length and bud length was 28.61 % and 31.33 % of that in CK resp.The inhibition effect of Cr6 on the growth of soybean radicle was more than that on bud growth.Conclusion Chromium treatment had stimulation effect at lower concentrations and inhibition effect at high concentrations on seed germination and seedling growth of soybean.And chromium at the concentration of less than 10 mg/L had a promotion effect on seed germination and seedling growth of soybean.