園芸作物に於けるビタミン B1 の生理と利用に関する研究(第4報) : ビタミン B1 葉面撒布後の甘藷植物体内に於けるピタミン B1 の消長

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This paper reports the results of the studies on the effect of foliage thiamin sprays on the thiamin content of the sweet potato plants. Five varieties, Norin No. 1, Norin No.2, Norin No.4, Kanto No. 24, and Taihaku, were used. Thiamin was dete-rmined by the thiochrome reaction (Permutit met-hod, NISHIO 1946). The results obtained were as follows. 1. Thiamin in water solution sprayed on the leaves of the sweet potatoes was absorbed by all organs of plants in 24 hours. Moreover, thiamin absorbed by the plants was accumulated in the parts of high activity. 2. Greater parts of the thiamin absorbed by the leaves of the sweet potatoes were of free form immediately after absorption, but some parts of them were transformed to combined form as time elapsed. 3. Thiamin was absorbed more easily through the lower surface than through the upper surface in the sweet potato leaves.
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