La-Gly对Pb胁迫下大豆幼苗生理生化特性的影响

Effect of La-Gly on Physiological and Biochemical Characteristics of Glycine max Seedling under Pb Stress

大豆幼苗在高剂量Ｐｂ 胁迫下， 生理生化特性发生明显改变， 其中ＭＤＡ、质膜透性、ＣＡＴ和ＰＯＤ 活性急剧上升。叶面喷布３０ ｍｇ·Ｌ－１ＬａＧｌｙ１ 次， 可缓解Ｐｂ 对大豆幼苗的伤害。这同ＬａＧｌｙ 降低植株体内Ｐｂ 含量， 增强光合作用与ＮＲ 活性， 降低ＭＤＡ含量与质膜透性， 维持保护膜（ＣＴＡ、ＰＯＤ） 活性等多重作用相关。

The physiological and biochemical characteristics of Glycine max seedling were changed under the high concentration fo Pb stress, in which the malon dialdehyde(MDA) content, plasmolemma permeability, activities of catalase(CAT) and peroxidase(POD) increased drastically. The damage effect of Pb was reduced when 30 mg·L -1 La Gly was sprayed to Glycine max seedling one time. The experiment proved the effect is related to that La Gly decrease Pb content, raise photosynthetic rate and nitrate reductase(NR) activity, reduce MDA content and cell membrane permeability, keep activities of CAT and POD.