Nitate assimilation in rice seedlings as affected by mineral nutrition

概要

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Deficiencies of each macronutrient (N, P, K, Ca, Mg and Fe) in the culture solution depressed the specific activities of nitrate reductase (NR) and nitrite reductase (NiR) from rice seedlings. Nitrate and potassium deficiencies especially lowered NR induction, whereas phosphorus deficiency caused the least decrease in enzyme induction. On the other hand the activity of NiR was decreased most by deficiencies of nitrate and phosphorus. Potassium deficiency was not as effective in suppressing the induction of NiR. Sulfur deficiency slightly promoted the induction of both NR and NiR. Generally, micronutrient deficiencies did not affect either enzyme. NR induction was slightly decreased by B, Zn, Cu and Mo deficiencies, and increased by Mn deficiency; whereas NiR activity was slightly increased by B and Cu deficiencies, and was not affected by other micronutrients. Nitrate content was decreased by deficiencies of N, P, K, Ca, and micronutrients, and unaffected by Mg, Fe and S deficiencies. Glutamic acid dehydrogenase (GDH) activity was increased by N, Fe and P deficiencies, and decreased by Mo and Zn deficiencies, and unaffected by other nutrient treatments.
日本植物生理学会の論文