Abstract: With sandy culture, effect of low-phosphorus stress on membrane lipid peroxidation, protective enzyme system activity, and acid phosphatase(Apase) activity in rice seedlings roots of low-phosphorus-tolerant cultivars(Dalidao,Liantangzao 3) and low-phosphorus-sensitive cultivars(Huzhanqi, Xinshanbaili) were analyzed. Low-phosphorus stress aggravated the membrane lipid peroxidation in rice roots, enhanced SOD, CAT, POD and Apase activities. In low-phosphorus-tolerant cultivars, protective enzyme activity increased more greatly, while MDA and Apase activities less severely than those in low- phosphorus-sensitive cultivars.

Key words: rice, phosphorus, protective enzyme system, membrane lipid peroxidation, acid phosphatase

摘要： 利用砂培方法, 研究了耐低磷水稻品种（大粒稻、莲塘早3号）和低磷敏感水稻品种（沪占七、新三百粒）幼苗在低磷条件下根系的膜脂过氧化和保护酶系统活性，以及酸性磷酸酶活性的变化。低磷胁迫加剧水稻根系膜脂过氧化, 提高保护酶系统活性，耐低磷品种保护酶系统活性的增加幅度更大，丙二醛含量增加幅度小；低磷胁迫使根系中酸性磷酸酶活性升高，而低磷敏感品种上升幅度更大。

关键词: 水稻, 磷素, 保护酶系统, 膜脂过氧化, 酸性磷酸酶