硅对干旱胁迫下野生大豆幼苗生长和生理特性的影响

为探讨外源硅对干旱胁迫下野生大豆生长的影响,以野生大豆为试验材料,研究不同浓度外源硅对干旱胁迫下大豆幼苗的生长及生理特性的影响。结果表明:干旱胁迫会使野生大豆鲜重、干重、叶绿素含量、根系活力及SOD、CAT、POD活性降低,细胞膜透性、MDA、游离脯氨酸及可溶性糖含量增加。随着硅处理浓度的不断升高,野生大豆鲜重、干重、叶绿素含量、根系活力逐渐增加;低浓度硅胁迫提高了SOD、CAT、POD活性,降低了细胞膜透性、MDA、游离脯氨酸及可溶性糖含量,随着硅胁迫浓度的不断提高,SOD、CAT、POD活性逐渐下降,细胞膜透性、MDA、游离脯氨酸及可溶性糖含量先下降再升高。说明一定浓度的外源硅能有效促进干旱胁迫下野生大豆幼苗的生长,提高抗氧化酶活性,降低细胞膜透性、MDA、游离脯氨酸及可溶性糖含量,能够缓解干旱胁迫对野生大豆幼苗的危害,提高野生大豆抗旱能力。

Effects of Silicon on Growth and Physiological Characteristics of Wild Soybean Seedlings Under Drought Stress

In order to explore the effect of exogenous silicon on the growth of wild soybean under drought stress,the effects of different concentrations of exogenous silicon on the growth and physiological characteristics of soybean seedlings under drought stress were studied.The results showed that drought stress could reduce the fresh weight,dry weight,chlorophyll content,root vigor and SOD,CAT,POD activity of wild soybean,and increase cell membrane permeability,MDA content,free proline and soluble sugar content.With the increasing of silicon concentration,fresh weight,dry weight,chlorophyll content and root vigor of wild soybean increased.Low concentration of silicon stress increased the activity of SOD,CAT and POD,reduced cell membrane permeability,MDA content,free proline and soluble sugar content,with the increasing of silicon stress concentration,SOD,CAT,POD activity gradually decreased,cell membrane permeability,MDA content,free proline and soluble sugar content decreased first and then increased.It indicated that exogenous silicon could effectively promote the growth of wild soybean seedlings under drought stress,improve the antioxidant enzyme activity,reduce cell membrane permeability,MDA content,free proline and soluble sugar of content,so exogenous silicon can alleviate the harm of drought stress to wild soybean seedlings and improve the drought resistance of wild soybean.