【摘要】 氯酸钾抗性是水稻籼粳分类重要指标之一,深入研究氯酸钾抗性机制对揭示籼粳分化的遗传生理基础具有理论和实践意义。笔者利用4份籼稻材料和4份粳稻材料,研究硝酸还原酶NR、亚硝酸还原酶NIR与水稻氯酸钾抗性的关联性。结果表明:NR酶活与水稻氯酸钾反应指数呈显著正相关（r=0.716^*,显著性水平0.046）,NIR酶活与水稻的氯酸钾反应指数相关性不显著（r=-0.628,显著性水平0.096）,而NIR/NR比值与水稻的氯酸钾反应指数呈极显著负相关(r=-0.879^**,显著性水平0.004);当NR活性受抑制时,则NIR酶活与水稻氯酸钾反应指数呈显著负相关（r=-0.709^*,显著性水平0.049）。由此推断,NIR/NR的相对大小影响了水稻氯酸钾抗性的强弱,这对深入揭示水稻氯酸钾抗性机理有重要参考价值。更多还原

【Abstract】 Chlorate resistance is one of the reliable characters in Indica/Japonica classification. To understand the mechanism of chlorate resistance is very important for revealing the evolutionary mechanism of Indica/Japonica differentiation. In this study, 4 Indica materials and 4 Japonica materials were used to detect the correlation between nitrate reductase（NR）, nitrite reductase（NIR） and chlorate resistance. NR activity showed a significantly positive correlation with chlorate response index（r=0.716^*, 0.046 significance level）, and the correlation of NIR activity and chlorate response index was not significant（r=-0.628, 0.096 significance level）, whereas the ratio of NIR/NR showed a very significantly negative correlation with chlorate response index(r=-0.879^**, 0.004 significance level). When NR activity was inhibited partially, NIR activity was changed with a significantly negative correlation with chlorate response index（r=-0.709^*, 0.049 significance level）. Therefore, we deduce that the ratio of NIR/NR may be a strong influence on chlorate resistance, and a great value for revealing the mechanism of chlorate resistance of Oryza sativa.更多还原