低钾胁迫对不同耐性玉米自交系保护酶活性及膜脂过氧化的影响

The Influence of Low-potassium Stress on Protective Enzyme Activity and Membrane Lipid Peroxidation of Different Tolerance Maize Self-bred Line

土壤中有效钾供应不足已成为目前我国玉米生产的主要限制因素之一。以耐低钾玉米自交系90-21-3,91-2和不耐低钾玉米自交系D937,N40为试材,研究低钾胁迫下不同耐性玉米自交系生长的影响。结果表明:低钾胁迫下,叶片SOD活性下降,90-21-3和91-2的SOD活性高于D937和N40;90-21-3和91-2的POD活性降低不明显;MDA含量增加,90-21-3和91-2体内产生MDA的量较少。耐低钾玉米自交系90-21-3和91-2的自由基清除系统活性较高,能有效减轻膜质过氧化伤害。

That the supply of available potassium in soil is insufficient has become one of the main limitations of maize production in China at present. Taken resistance to low-potassium maize self-bred line 90-21-3, 91-2 and sensitive to low-potassium maize self-bred line D937, N40 as the testing material, the influence of low-potassium stress on different tolerance maize self-bred line development. The results showed that： In the condition of low-potassium stress, the blade SOD activity declines, the SOD activity of90-21-3 and 91-2 is higher than D937 and N40; It is not obvious that the POD activity of 90-21-3 and 91-2 declines; MDA content increases, the amount of MDA produced in body of 90-21-3 and 91-2 is less. Free radical scavenging system of resistance to low-potassium maize self-bred line 90-21-3 and 91-2 has higher activity, which can efficiently alleviate the harm of membrane lipid peroxidation.