【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(Na2Si O3)对K2Cr2O7(0.6 mmol/L)、Cu SO4(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,Na2Si O3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,Na2Si O3浓度为1.0mmol/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。更多还原

【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 Cu SO4(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 Cu SO4 stresses.The chlorophyll content in wheat seedlings were reduced significantly under K2Cr2O7 and Cu SO4 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 Cu SO4 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 Cu SO4 stresses.Exogenous silicon with appropriate concentration could alleviate the damage caused by K2Cr2O7 and Cu SO4 stresses to the wheat seedlings.更多还原