摘要： 对10个水稻栽培种和10个陆稻栽培种的研究结果表明，水稻和陆稻根系发育过程中蛋白质含量、POD和COD同工酶都有较明显的差异，陆稻根系中蛋白质含量高于水稻的含量，陆稻的POD同工酶谱带数虽少于水稻，但苗期和分蘖期酶谱带总面积却高于水稻。在不同发育时期，陆稻中POD同工酶谱型变化较水稻稳定。陆稻根系中COD同工酶谱带数多于水稻，但苗期和分蘖期大部分COD同工酶的相对酶活性低于水稻，陆稻根系发育过程中，在开花期尚能检测到COD₇酶带。与水稻相比，陆稻根系发育过程中COD同工酶谱型的变化较小。

关键词: 陆稻, 水稻, 细胞色素氧化酶同工酶, 聚丙烯酰胺凝胶电泳, 耐旱性

Abstract: The study results showed that the protein content in root system of upland rice was higher than that of lowland rice; the POD isozyme bands number in root system of upland rice was less than that of lowland rice, but the total areas of these isozymes bands in the former were larger than that in the latter when they were at seedling and tillering stages.At every development stages the POD isozymes zymograms in root system of upland rice were more stable than that oflowland rice, the COD isozyme bands number in the former was more than that in the latter, but at the seedling and tillering stages the relative activity of COD isozymes in upland rice was mostly lower than that in lowland rice.In the development course of the root system the COD₇ bands could be found out even at the flowering period in the upland rice root.In the same course the COD isozyme zymograms in the root system of upland rice were more stable than that oflowland rice.

Key words: Upland rice, Lowland rice, Protein content, Cytochromc oxidasc isozymc, Polyacrylamide gel clcctrophorcsis, Drought tolerance