Nitrate reduction of tobacco leaves along the stalk position
1987
Lee, Y.H. (Korea Ginseng and Tobacco Research Inst., Taeduk (Korea R.)) | Lim, S.U. (Seoul National Univ., Suwon (Korea R.). Coll. of Agriculture)
NO3-N absorbed from roots was transported as inorganic nitrogen through the vascular tissue of leaf veins resulting in the high NO3-N ratio of the nitrogen content in leaf veins, but these ratios in mesophyll tissue of the same leaf laminae decreased remarkably in disregard of higher accumulation of nitrogen being compared with midvein. Mesophyll tissue of mature leaves appeared higher value of nitrate reductase activity (NRA) comparing with other tissues, stem, leaf vien, and meristematic tissue at emergence point with young leaves. Matured leaves at lower position reducing nitrate nitrogen vigorously observed thick laminae and kept high amount of water in them. Mature leaves of young plant reduced1290NO3-N vigorously for supply synthetic N compounds to meristematic tissues at growing point by the reason of narrow and few leaves at young stage, but in advancing growth period NRA of mature leaves along upper position reached to lower value. This appearance is attributed to distribution of organic-N compound demanding for growth to increasing numbers of wide leav
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