东乡野生稻根系抗氧化系统对冷胁迫的反应

Response of Antioxidative System to Chilling Stress in Dongxiang Wild Rice

以强耐冷的东乡野生稻和冷敏感的晚籼稻926为材料,研究了它们根系抗氧化系统对冷胁迫的反应。经过3 d不同水平的冷处理后,东乡野生稻根系的电解质渗透率和丙二醛(MDA)含量受影响较小,而晚籼稻926根系的则随着冷胁迫的加剧而加速上升;东乡野生稻根系的过氧化物酶(POD)活性和过氧化氢酶(CAT)活性仍然较高,而晚籼稻926的则随着冷胁迫的加剧而加速下降。这些结果表明:在冷胁迫下具有较小的电解质渗透率、较低的丙二醛含量和较高活性的抗氧化酶是东乡野生稻根系强耐冷的主要原因。

Taking strong cold -tolerant Dongxiang wild rice and cold -susceptible late indica rice variety 926 as the tested materials, the response of antioxidative system in the root system to chilling stress was investigated. After different levels of chilling stress for 3 days, Dongxiang wild rice showed little change in electrolyte leakage and MDA content in comparison with the control plants, while the electrolyte leakage and MDA content in 926 increased significantly. Activities of CAT and POD in Dongxiang wild rice remained high, while those of 926 decreased under chilling stress. The results indicated that higher activities of antioxidatase and less electrolyte leakage and MDA content under chilling stress were associated with the strong tolerance of the root system to chilling in Dongxiang wild rice.