Accumulation of ribulose-1,5-bisphosphate carboxylase/oxygenase in potato plants and nitrogen distribution in each organ during growth in relation to productivity

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Abstract
To analyze the effect of nitrogen application at the tuber swelling stage, 15N assimilated at various growth stages was traced during growth, and the amounts of ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco) and chlorophyll were determined during growth. The results obtained were as follows. Thus, it is considered that nitrogen applied after the flowering stage (tuber swelling stage) had no effect on the increase of the tuber yield because nitrogen application did not enable to stimulate the Rubisco accumulation and nitrogen was distributed to the tubers for storage, but not to the leaves for maintaining the physiological function of the leaves.