英语翻译摘要：硝酸盐在植物体内积累过多已成为影响蔬菜品质并影响人类健康的重要因素,硝酸还原酶是硝酸盐代谢中的关键酶,提高

The nitrate had accumulated the healthy key factor already have become the quality affecting vegetable,and affecting human being within the plant body,hydrogen nitrate reductase key enzyme in being that the nitrate metabolizes ,nitrate beneficial to improving whose activity degradation.The main body of a book is adopt to follow different condition of admeasurement in vitro to active effect of stem tumour mustard hydrogen nitrate reductase.Different course the different pH ,the different temperature ,different time ,different potassium nitrate thickness and hydrogen nitrate reductase thickness of tumour mustard hydrogen nitrate reductase treatment indicates a stem:The most suitable stem tumour mustard hydrogen nitrate reductase pH is 6.8; The most suitable temperature is 25 C; The most suitable bottom thing potassium nitrate thickness is mol/L ,thickness is relatively sufficient in stem tumour mustard hydrogen nitrate reductase when big ,stem tumour mustard hydrogen nitrate reductase activity rises gradually with the fact that bottom thing thickness increases by.Reaction condition exceeds or the enzymatic activity city accepts when being unable to reach the most suitable condition restraint.Simultaneous ,be enough in bottom thing potassium nitrate thickness when big,under lower condition of relative enzyme liquid thickness,the relative thickness increasing enzyme liquid gradually ,relative with hydrogen nitrate reductase reaction speed thickness increasing by but increase by,the enzyme reaction rate increases by also with that.Keywords:Hydrogen nitrate reductase pH temperature time potassium nitrate thickness activator depresso