摘要： 五种活性氧清除剂分别喷施4叶期玉米幼苗，均使受渍玉米叶片的叶绿素含量显着提高，O₂^-产生速率和H₂O₂浓度明显下降，而谷胱甘肽和抗坏血酸含量增加。这种效应以处理后期（第5天）和老叶（第2叶）较为明显，但各清除剂之间的差异较小。表明各种活性氧清除剂单独使用皆能缓解受渍玉米的涝害，从而增强玉米的抗涝性。试验结果为活性氧参与玉米的涝渍伤害过程提供了证据，也为应用化学调控手段减轻玉米涝害的可能性提供了理论依据。

关键词: 玉米, 涝渍, 活性氧, 活性氧清除剂

Abstract: Waterlogging is one of the major stress factors limiting summer corn (Zea mays L.)production. This study was conducted to determine whether exogenous active oxygen scavengers ameliorated the detrimental effects of waterlogging on H₂O₂, chlorophyll, ascorbic acid (AsA),glutathione (GSH) contents, and O₂-production rate of corn plants grown in the greenhouse.Five scavengers, i. e. 8-hydroxyquinoline (8-HQ), AsA, GSH, a-tocopherol (VitE) and sodium benzoate(SB), were sprayed on the leaves at the beginning of waterlogging treatment. The parameters mentioned above were measured at the 3rd and 5th day after the treatment. These scavengers obviously decreased O2-production rate and H2O2 content, significantly increased chlorophyll content and non-enzymatic antioxidants (AsA, GSH) concentrations. The profound effects of scavengers were found in the old leaf (2nd leaf) and at the later stage (5th day) of the treatment. The results suggested that scavengers can lessen corn waterlogging injury probably caused by oxyradicals. Ameliorative effects of exogenous active oxygen scavengers provided an evidence for alleviating waterlogging damage to corn plants through chemical application.

Key words: Corn, Waterlogging, Active oxygen, Active oxygen scavengers

中图分类号: 

• S513.05