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作物根系吸收硝态氮后,运往叫片先被还原成氨态氮,然后合成为有机氮。在硝态氮还原过程中,硝酸还原酶(NR)起着调控作用。有关作物耐肥性的研究亦已阐明,作物对氮素的反应特性与NR活性存在着负相关,不同品种间NR活力的差异,主要是由于体内酶的诱导合成水平不同而造成。由于NR是一种诱导酶,在植物体内极不稳定,诸如光强、温度、pH、CO_2、O_2分压、水势、氮的供应水平等等因素,都会导致NR活性的变化和波
After the crop roots absorb nitrate nitrogen, they are first reduced to ammonia nitrogen and then to organic nitrogen. Nitrate reductase (NR) plays a regulatory role in nitrate reduction. Studies on the fertility resistance of crops have also clarified that the response characteristics of crops to nitrogen and NR activity are negatively correlated. The difference in NR activity among different varieties is mainly due to the different levels of induced synthesis of enzymes in the body. Because NR is an inducible enzyme, it is extremely unstable in plants. Factors such as light intensity, temperature, pH, CO 2, O 2 partial pressure, water potential, nitrogen supply and so on will lead to changes in NR activity and wave