大豆硝酸还原酶活力与硝态氮含量的关系

大豆植株主茎硝酸盐含量从基部向上逐渐增加,营养生长期和开花盛期,近幼生茎下段茎节间硝态氮含量较高,结荚期以后幼生茎段硝态氮含量较高。大豆品种间硝态氮含量和硝酸还原酶活力有明显的差异。吉林20号硝态氮含量和硝酸还原酶活力较高,而大白眉较低。大豆品种间内源基质硝酸还原酶活力差异和外源基质硝酸还原酶活力差异结果是一致的。内源基质硝酸还原酶活力和外源基质硝酸还原酶活力都与幼生茎段硝态氮含量呈显著正相关。

RELATION OF NITRATE REDUCTASE ACTIVITY TO NITRATE CONTENT IN SOYBEAN

Nitrate contents in main stem of soybeans gradually increased from the base to the shootapex. Nitrate content peak appeared in stem inrernodes which was closet to young stem - parts during vegetative and flowering stage, but nitrate content peak appeared in y.oung stem parts after early pod seting stage There were cultivar specific difference in nitrate content and nitrate reduetase (NR ) activity in vivo. The nitrate content of Jilin 20 was highest while the nitrate content of Dabaimei was lowest among cultivars. The cultivars which had higher nitrate content exhibited higher NR activity. The NR activity difference in soybean cultivars were consistent whether with endogenous substrate or with exogenous substrate. A significantly positive corre lation between ntirate contents in voung. stein parts and the NR activities whether with en dogenous substrate or with exogenous substrate were observed.