On the Loss of Dry Matter from Leaves at Night in maturing Stage of Flue-cured Tobacco Plant. : (II) The Relation of the Loss of Dry Matter from Leaves by Translocation to Leaf Position, Nitrogen Concentration of Leaves and Roots Condition.

[摘要] Flue-cured tobacco seedlings were transplanted in pots of 12cm in diameter. Ten days after that, another pots were set on the pots so as to make upper roots develop, conductive tissues of which have close relation to upper leaves. After topping, the loss of dry matter from leaves by translocation was investigated in relation to leaf position on the stem, nitrogen concentration of leaves and roots conditions. Just after topping, the increase of dry matter by translocation in upper small leaves was recognized. Being fully expanded, however, upper leaves lost dry matter by translocation. When large amounts of nitrogen were supplied to upper roots, the amounts of the loss of dry matter from upper leaves by translocation markedly increased; but it decreased by cutting upper roots off. Although it had been generally recognized that lower leaves lost dry matter by translocation, high nitrogen concentration in lower leaves and increment of dry matter by translocation in these leaves were observed as the results of nitrogen supply to lower roosts. These facts, as shown above, reveal that quantitative change of leaf dry matter by translocation is influenced by nutritive condition of leaf beyond the relation with leaf position on the stem, and also influenced by metabolic activity of roots.

[学科分类] 农业科学（综合）