氯苯、硝基苯胁迫对小麦种子萌发和幼苗生理特性的影响

在实验水培条件下,研究了不同浓度氯苯、硝基苯对小麦种子萌发和幼苗生长的影响。结果表明,氯苯和硝基苯均能明显地抑制小麦种子萌发和幼苗的生长,幼苗干重、鲜重存在不同程度的下降,受害程度随氯苯和硝基苯浓度的增加而加重,小麦对硝基苯和氯苯的胁迫敏感性为根>苗,当硝基苯浓度在50mg/L以上时小麦种子发芽停止。在正常情况下,小麦幼苗体内叶绿素含量、过氧化物酶活性和丙二醛含量均随浓度的增加呈先增加后下降的趋势。在浓度为10mg/L硝基苯和氯苯胁迫下,小麦幼苗体内叶绿素含量达到最大值;过氧化物酶活性最高时所对应的硝基苯和氯苯浓度分别为25mg/L和50mg/L;丙二醛含量达到最高时所对应的硝基苯和氯苯浓度均为25mg/L。

Effects of Nitrobenzene and Chlorobenzene on Seed Germination and Biological Characters of Wheat

Effects of different concentrations of nitrobenzene and chlorobenzene on seed germination and biological characters of wheat were studied. The results showed that seed germination and growth of wheat were refrained when the concentration of nitrobenzene and chlorobenzene were more than 10 mg/L. Also, fresh weight and dry weight were inhibited. In addition, roots were more sensitive to nitrobenzene and chlorobenzene than shoots. The seed germination was stopped by 50 mg/L of nitrobenzene. The concentration of 10 mg/L was discovered to be the optimal concentration for chlorophyll. In a specific range of nitrobenzene and chlorobenzene stress, the activity of peroxidase and the concentration malondialdehyde increased with increasing nitrobenzene and chlorobenzene concentrations, however, enzymatic activity and malondialdehyde decreased when the nitrobenzene and chlorobenzene stress was overwhelmed.