Abstract: The ability of uptake and assimilation of nitrate in Indica and Japo-nica rice(Oryza sativa L.)have been compared.The results showedthat:1).The rate of nitrateuptake by root in Indica rice was higher than that in Japonica rice.2).The activities of nitrate reductase and nitrite reductase,which catalyzethe reduction of NO₃^- to NH₄⁺,were higher in Indica rice than in Japo-nica rice.3).In the two pathways of the incorporation of ammoniainto amino acid:glutamate dehydrogenase and glutamine synthetase/glu-tam...