摘要： 为了明确外源硅对小麦铬、铜毒害的缓解效应,以普通小麦品种京冬8号为材料,采用水培试验,研究硅(Na₂SiO₃)对K₂Cr₂O₇(0.6 mmol/L)、CuSO₄(0.8 mmol/L)胁迫下小麦幼苗生理生化指标的影响。结果表明:在铬、铜胁迫下,小麦幼苗可溶性糖含量、丙二醛(MDA)含量、超氧化物歧化酶SOD和过氧化物酶POD活性显著升高,叶绿素含量显著降低;外源硅能显著降低铬、铜胁迫下小麦幼苗的可溶性糖含量、MDA含量以及SOD和POD活性,Na₂SiO₃浓度为1.5 mmol/L时,效果最明显;外源硅能显著提高铬、铜胁迫下小麦幼苗的叶绿素含量,Na₂SiO₃浓度为1.0 mmol/L时,效果最明显。适当浓度的外源硅能在一定程度上减轻重金属铬、铜胁迫对小麦幼苗的伤害。

关键词: 硅, 重金属, 小麦, 生理生化指标

Abstract: In this study,using wheat variety(Jingdong 8) as material,effects of exogenous silicon on physiological and biochemical indexes of wheat seedlings under K₂Cr₂O₇(0.6 mmol/L) and CuSO₄(0.8 mmol/L) stresses were studied in hydroponic conditions.The results showed that the soluble sugar content,MDA content,the activity of SOD and POD in wheat seedlings were significantly increased under K₂Cr₂O₇ and CuSO₄ stresses.The chlorophyll content in wheat seedlings were reduced significantly under K₂Cr₂O₇ and CuSO₄ stresses.Exogenous silicon with the concentration of 1.5 mmol/L played a noticeable role in reducing the soluble sugar content,MDA content,the activity of SOD and POD in wheat seedlings under K₂Cr₂O₇ and CuSO₄ stresses.Exogenous silicon with the concentration of 1.0 mmol/L played a noticeable role in creasing the chlorophyll content in wheat seedlings under K₂Cr₂O₇ and CuSO₄ stresses.Exogenous silicon with appropriate concentration could alleviate the damage caused by K₂Cr₂O₇ and CuSO₄ stresses to the wheat seedlings.

Key words: Silicon, Heavy metals, Triticum aestivum, Physiological and biochemical indexes

中图分类号: 

• S512.01