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Studies on the cell sap concentration determined by the refractometric method and some other physiological properties of mulberry leaves. VIII. Changes of the cell sap concentrations according to the leaf position on the mulberry shoots in different stages of growth



Studies on the cell sap concentration determined by the refractometric method and some other physiological properties of mulberry leaves. VIII. Changes of the cell sap concentrations according to the leaf position on the mulberry shoots in different stages of growth



Res Rept Fac Textile And Sericult Shinshu Univ 10: 1-6



The cell sap concentrations of the leaf blades of mulberry shoots were determined by the Abbe's refractometer. Two-year-old stems grown from the stock near the ground were cut off in early spring and several shoots were grown from the stock. The cell sap concentrations of the leaves were determined at 3 different periods. Leaves at the top of the shoot were growing vigorously in size, leaves in the middle position on the shoot were in the adult stage when no growth in size could be observed, and leaves at the bottom of the shoot were in the senescent stage. The cell sap concentration of the leaf blade of the uppermost young leaves was lowest and there was a rapid increase of the concentration from the top leaves downwards. The adult leaves in the middle position had the highest and relatively most stable cell sap concentration, and the senescent leaves showed irregular variations. These changes of cell sap concentration according to the leaf positions on the shoot were similarly observed in all shoots in different growth seasons. And the cell sap concentration at the same position of the shoot became greater step by step and therefore the curve of the changes of cell sap concentration according to the leaf position transposed itself to a higher level progressively as the season advanced. But when the growth of the shoot stopped the curve changed to a lower level showing that nearly all the leaves at this time went into the senescent stage. The cell sap concentrations of the petioles were also determined, and almost the same changes of the concentration according to the leaf positions and to the growth seasons were obtained, except that the concentrations of the petioles were obviously lower and their changes according to the leaf positions differed somewhat in detail because of their higher water content and water storing capacity.

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