The sugarcane varieties introduced fromBrazil showed higher nitrate reductase activity as compared to the native ones under nitrogenfree condition except for the variety RB72-454.

• 除了RB72-454品种外,几个巴西品种的硝酸还原酶活性都较高,当地甘蔗品种与巴西引进甘蔗品种的硝态氮含量和谷氨酰胺合成酶活性相差不大;