摘要
用两组积累硝酸盐不同的白菜品种作试材 ,测定其吸收硝酸盐的速率、动力学常数Km与Vmax、硝酸还原代谢库内硝酸根浓度 (MPS)和硝酸还原酶活性 (NRA) ,结果表明 ,不同白菜品种吸收硝酸根的速率、Km与Vmax、MPS、NRA存在较大的差异 ;硝酸盐积累的差异主要是由于吸收硝酸根的速率不同 ,与硝酸根在其体内的运转。
Four pak choi cultivars with different nitrate accumulation level were applied for explaining their genotypic variation in nitrate accumulation.Their dynamics parameters in nitrate uptaking,Michaelis constant(Km),the maximum uptake Velocity(V max ),nitrate content in nitrate maetabolic pool(MPS)and nitrate reductase activity(NRA),were measured,results showed that Km and V max ,MPS,NRA varied greatly in different pak choi cultivars.But there was no relationship between nitrate content and NRA,MPS.Their variation in nitrate accumulation more resulted from their different uptake rate of nitrate than their NRA,MPS.
出处
《园艺学报》
CAS
CSCD
北大核心
2003年第4期470-472,共3页
Acta Horticulturae Sinica
基金
国家自然科学基金项目 (3 95 70 496)
