Abstract: With sandy culture, effects of low phosphorus stress on membrane lipid peroxidation and protective enzyme activities in rice seedlings of low phosphorus tolerant cultivars(Dalidao, Liantangzao 3) and low phosphorus sensitive cultivars(Huzhanqi, Xinsanbaili) were studied. Results indicated that low phosphorus stress aggravated the membrane lipid peroxidation in rice leaves, which was more severe in low phosphorus sensitive cultivars than that in low phosphorus tolerant cultivars. During the stress period, SOD, CAT, POD activity in low phosphorus tolerant cultivars maintained relatively stable, whereas those in low phosphorus sensitive cultivars increased obviously at early stage, then decreased rapidly, which might suggest that the activities of protective enzyme system had no significant relation with low phosphorus stress, but its trend did so.

Key words: rice, phosphorus, stress, membrane lipid peroxidation, protective enzyme

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）在低磷胁迫下，水稻叶片膜脂过氧化和保护酶活性的变化。研究结果表明，低磷胁迫使水稻叶片膜脂过氧化加剧，低磷敏感水稻品种的叶片膜脂过氧化程度高于耐低磷水稻品种；耐低磷品种叶片中SOD、CAT和POD活性在低磷胁迫期间相对稳定，而低磷敏感品种在低磷胁迫初期均有明显增加，尔后又快速下降，这表明保护酶的绝对活性与低磷胁迫无关，而变化趋势与低磷胁迫有关。

关键词: 水稻, 磷素, 胁迫, 膜脂过氧化, 保护酶